CN104252847A - Light emitting module and control method - Google Patents
Light emitting module and control method Download PDFInfo
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- CN104252847A CN104252847A CN201310254926.9A CN201310254926A CN104252847A CN 104252847 A CN104252847 A CN 104252847A CN 201310254926 A CN201310254926 A CN 201310254926A CN 104252847 A CN104252847 A CN 104252847A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The invention provides a light emitting module and a control method. The light emitting module comprises a power source, and a first light emitting portion and a second light emitting portion which are respectively connected between the power source and a common voltage end, wherein the first light emitting portion comprises a first switch unit and a first light emitting unit which are connected in series, the second light emitting portion comprises a second switch unit and a second light emitting unit which are connected in series, the first switch unit and the second switch unit respectively control the first light emitting unit and the second light emitting unit to alternatively emit light according to a first PWM control signal and a second PWM control signal, the light emitting module further comprises a work time monitoring unit used for recording work time of the light emitting module and a control unit, based on a first control information table, the control unit adjusts the duty ratio of the first PWM control signal and the second PWM control signal according to the work time of the light emitting module, the light emitting module further comprises a third switch unit, based on a second control information table, the control unit outputs a switch control signal according to the work time of the light emitting module, and the third switch unit respectively provides extra current for the first light emitting unit and the second light emitting unit according to the switch control signal.
Description
Technical field
The present invention relates to light emitting module technical field, and relate more specifically to a kind of light emitting module and control method thereof.
Background technology
At present, for LCDs LCD, its life-span depends primarily on life-span of backlight module.Usually, the LCD that the life-span is long brings a high price, and the life-span of common LCD is 5 years.At present, be commercially difficult to the LCD finding the life-span to reach 15 years, be namely in display state 15 years always.
On the other hand, because the luminosity of the luminescent device in backlight module often reduces along with the increase of working time, namely under identical drive current, luminosity reduces, therefore along with the increase of working time, the brightness of the backlight that backlight module produces also reduces gradually, and this also have impact on the display effect of LCD.
Therefore, need a kind of light emitting module and the control method thereof that can be applied to backlight module, it not only has long service live, but also can provide good display effect in long service live.
Summary of the invention
Consider the problems referred to above, propose the present invention.The object of the present invention is to provide a kind of light emitting module and control method thereof, it, by utilizing two groups of luminescence units alternately luminous, can extend the mission life of these two groups of luminescence units (correspondingly, light emitting module) effectively when ensureing display brightness.Further, this light emitting module and control method thereof can also according to the adjustment of light emitting module working time for controlling the dutycycle of two pwm control signals of two groups of luminescence units, make the increase along with the working time, suitably can increase the duration of effective control level of pwm control signal, thus can constant luminance be kept.Further, this light emitting module and control method thereof can also increase the size flowing through the drive current of luminescence unit when the light emitting module working time exceedes predetermined threshold, make it possible to the problem effectively compensating the reduction of luminosity under identical drive current caused due to the aging of luminescence unit.
According to a first aspect of the invention, provide a kind of light emitting module, comprising: power supply, for providing supply voltage, first luminous component, it comprises the first resistance unit, the first switch element and the first luminescence unit that are connected in series, and the first end of this first luminous component is connected with described power supply, the second end of this first luminous component and common electrical press bond, and second luminous component, it comprises the second resistance unit be connected in series, second switch unit, and second luminescence unit, the first end of this second luminous component is connected with described power supply, second end of this second luminous component and described common electrical press bond, wherein, the control end of the first switch element receives the first pwm control signal, and control the first luminescence unit when described first pwm control signal is in effective control level luminous, the control end of second switch unit receives the second pwm control signal, and control the second luminescence unit when described second pwm control signal is in effective control level luminous, and under the control of described first pwm control signal and the second pwm control signal, described first luminescence unit and described second luminescence unit are alternately luminous.
Preferably, the resistance of the first resistance unit is identical with the resistance of the second resistance unit, described first pwm control signal is identical with the cycle of the second pwm control signal, described first pwm control signal and the second pwm control signal phase 180 °, described first pwm control signal is identical with the duration of effective control level of the second pwm control signal and be all less than the half in the cycle of described first pwm control signal and the second pwm control signal.
According to a second aspect of the invention, provide a kind of light emitting module, comprising: power supply, for providing supply voltage, first luminous component, it comprises the first resistance unit, the first switch element and the first luminescence unit that are connected in series between described power supply and common electrical pressure side, second luminous component, it comprises the second resistance unit, second switch unit and the second luminescence unit that are connected in series between described power supply and common electrical pressure side, working time monitoring unit, for recording the working time of described light emitting module, and control module, for receiving the working time that described working time monitoring unit records, and based on the first control information table, the duration of effective control level of described first pwm control signal and the second pwm control signal is adjusted according to the received working time, wherein, described first control information table stores the corresponding relation of the duration of effective control level of working time and described first and second pwm control signals, the control end of the first switch element receives the first pwm control signal, and control the first luminescence unit when described first pwm control signal is in effective control level luminous, the control end of second switch unit receives the second pwm control signal, and control the second luminescence unit when described second pwm control signal is in effective control level luminous.
According to a third aspect of the invention we, provide a kind of light emitting module, comprising: power supply, for providing supply voltage; First luminous component, it comprises the first resistance unit, the first switch element and the first luminescence unit that are connected in series between described power supply and common electrical pressure side; Second luminous component, it comprises the second resistance unit, second switch unit and the second luminescence unit that are connected in series between described power supply and common electrical pressure side; Working time monitoring unit, for recording the working time of described light emitting module; Control module, for receiving the working time that described working time monitoring unit records, and based on the second control information table, according to received working time output switch control signal; And described 3rd switch element, its first end and the second end are connected with the first end of described first resistance unit and the second end respectively, its the 3rd end and the 4th end are connected with the first end of described second resistance unit and the second end respectively, and its control end receives described switch controlling signal, wherein, when described switch controlling signal is in effective control level, described 3rd switch element connects the electrical connection between its first end and the second end and the electrical connection between its 3rd end and the 4th end.
The control end of the first switch element receives the first pwm control signal, and control the first luminescence unit when described first pwm control signal is in effective control level luminous, the control end of second switch unit receives the second pwm control signal, and control the second luminescence unit when described second pwm control signal is in effective control level luminous.
According to a forth aspect of the invention, provide a kind of light emitting module, comprising: power supply, for providing supply voltage; First luminous component, it comprises the first resistance unit, the first switch element and the first luminescence unit that are connected in series between described power supply and common electrical pressure side; Second luminous component, it comprises the second resistance unit, second switch unit and the second luminescence unit that are connected in series between described power supply and common electrical pressure side; Working time monitoring unit, for recording the working time of described light emitting module; Control module, for receiving the working time that described working time monitoring unit records, based on the second control information table, according to received working time output switch control signal, and based on the first control information table, adjust the duration of effective control level of described first pwm control signal and the second pwm control signal according to the received working time; And described 3rd switch element, its first end and the second end are connected with the first end of described first resistance unit and the second end respectively, its the 3rd end and the 4th end are connected with the first end of described second resistance unit and the second end respectively, and its control end receives described switch controlling signal, wherein, when described switch controlling signal is in effective control level, described 3rd switch element connects the electrical connection between its first end and the second end and the electrical connection between its 3rd end and the 4th end.
Described first control information table stores the corresponding relation of the duration of effective control level of working time and described first and second pwm control signals, the control end of the first switch element receives the first pwm control signal, and control the first luminescence unit when described first pwm control signal is in effective control level luminous, the control end of second switch unit receives the second pwm control signal, and control the second luminescence unit when described second pwm control signal is in effective control level luminous.
According to a fifth aspect of the present invention, provide a kind of driving method being applied to light emitting module according to a first aspect of the present invention, comprise: the control end of the first switch element receives the first pwm control signal, and control the first luminescence unit when described first pwm control signal is in effective control level luminous; The control end of second switch unit receives the second pwm control signal, and control the second luminescence unit when described second pwm control signal is in effective control level luminous, wherein, under the control of described first pwm control signal and the second pwm control signal, described first luminescence unit and described second luminescence unit are alternately luminous.
According to a sixth aspect of the present invention, provide a kind of driving method being applied to light emitting module according to a second aspect of the present invention, comprising: by the working time of working time monitoring unit record light emitting module; Based on the first control information table, control module adjusts the duration of effective control level of described first pwm control signal and the second pwm control signal according to the received working time; The control end of the first switch element receives the first pwm control signal, and control the first luminescence unit when described first pwm control signal is in effective control level luminous; The control end of second switch unit receives the second pwm control signal, and control the second luminescence unit when described second pwm control signal is in effective control level luminous, wherein, described first control information table stores the corresponding relation of the duration of effective control level of working time and described first and second pwm control signals, under the control of described first pwm control signal and the second pwm control signal, described first luminescence unit and described second luminescence unit are alternately luminous.
According to a seventh aspect of the present invention, provide a kind of driving method being applied to light emitting module according to a third aspect of the present invention, comprising: by the working time of working time monitoring unit record light emitting module; Based on the second control information table, control module is according to received working time output switch control signal; The control end of the 3rd switch element receives described switch controlling signal, when described switch controlling signal is in effective control level, described 3rd switch element connects the electrical connection between its first end and the second end and the electrical connection between its 3rd end and the 4th end; The control end of the first switch element receives the first pwm control signal, and control the first luminescence unit when described first pwm control signal is in effective control level luminous; The control end of second switch unit receives the second pwm control signal, and control the second luminescence unit when described second pwm control signal is in effective control level luminous, wherein, under the control of described first pwm control signal and the second pwm control signal, described first luminescence unit and described second luminescence unit are alternately luminous.
According to a eighth aspect of the present invention, provide a kind of driving method being applied to light emitting module according to a fourth aspect of the present invention, comprising: by the working time of working time monitoring unit record light emitting module; Based on the second control information table, control module is according to received working time output switch control signal; The control end of the 3rd switch element receives described switch controlling signal, when described switch controlling signal is in effective control level, described 3rd switch element connects the electrical connection between its first end and the second end and the electrical connection between its 3rd end and the 4th end; Based on the first control information table, control module adjusts the duration of effective control level of described first pwm control signal and the second pwm control signal according to the received working time; The control end of the first switch element receives the first pwm control signal, and control the first luminescence unit when described first pwm control signal is in effective control level luminous; The control end of second switch unit receives the second pwm control signal, and control the second luminescence unit when described second pwm control signal is in effective control level luminous, wherein, described first control information table stores the corresponding relation of the duration of effective control level of working time and described first and second pwm control signals, under the control of described first pwm control signal and the second pwm control signal, described first luminescence unit and described second luminescence unit are alternately luminous.
According to light emitting module and the driving method of each side of the present invention, on the one hand by control first luminescence unit and the alternately luminescence of the second luminescence unit; On the other hand control the first end of connection the 3rd switch element and the second end according to the received working time and connect the 3rd end and the 4th end of the 3rd switch element, namely, when the working time of light emitting module more than the first working time threshold value time, provide electric current to the first luminescence unit and the second luminescence unit extraly by the 3rd switch element; Again on the one hand by adjusting the duration of effective control level of described first pwm control signal and the second pwm control signal according to the received working time, namely, along with the increase of working time, increase the duration of effective control level of the first pwm control signal and the second pwm control signal according to predetermined relationship, the working time that can compensate better due to luminescent device increases the luminescent device luminosity that the identical drive current that causes produces and reduces.
Accompanying drawing explanation
Describe according to the embodiment of the present invention by reference to accompanying drawing, the various feature and advantage of the embodiment of the present invention will be more obvious, and also more easily be understood, in the accompanying drawings:
Fig. 1 shows the schematic block diagram of the first example of light emitting module according to a first embodiment of the present invention;
Fig. 2 shows the schematic block diagram of the second example of light emitting module according to a first embodiment of the present invention;
Fig. 3 shows the schematic block diagram of the first example of light emitting module according to a second embodiment of the present invention;
Fig. 4 shows the schematic block diagram of the second example of light emitting module according to a second embodiment of the present invention;
Fig. 5 shows a kind of sample implementation of light emitting module according to a second embodiment of the present invention;
Fig. 6 shows the exemplary timing chart of the first pwm control signal according to the embodiment of the present invention and the second pwm control signal;
Fig. 7 shows the process flow diagram of light emitting module control method according to a first embodiment of the present invention;
Fig. 8 shows the process flow diagram of light emitting module control method according to a second embodiment of the present invention;
Fig. 9 shows the process flow diagram of light emitting module control method according to a third embodiment of the present invention; And
Figure 10 shows the process flow diagram of light emitting module control method according to a fourth embodiment of the present invention.
Specific implementation
First with reference to figure 1-Fig. 5, the light emitting module according to the embodiment of the present invention will be described below.
Light emitting module according to a first embodiment of the present invention comprises power supply, the first luminous component, the second luminous component, described first luminous component comprises the first resistance unit, the first switch element and the first luminescence unit that are connected in series, described second luminous component comprises the second resistance unit, second switch unit and the second luminescence unit that are connected in series, described first luminous component be all connected with described power supply with the first end of the second luminous component and its second end all with common electrical press bond.The control end of the first switch element receives the first pwm control signal, and control the first luminescence unit when described first pwm control signal is in effective control level luminous, the control end of second switch unit receives the second pwm control signal, and control the second luminescence unit when described second pwm control signal is in effective control level luminous, and under the control of described first pwm control signal and the second pwm control signal, described first luminescence unit and described second luminescence unit are alternately luminous.
Fig. 1 and Fig. 2 respectively illustrates the first example of light emitting module according to a first embodiment of the present invention and the schematic block diagram of the second example.
As shown in Figure 1, described light emitting module comprises power supply 101, first luminous component, the second luminous component, described first luminous component comprises the first resistance unit 102, first luminescence unit 104 and the first switch element 106 be sequentially connected in series, and described second luminous component comprises the second resistance unit 103, second luminescence unit 105 and the second switch unit 107 be sequentially connected in series.
The first end of the first resistance unit 102 is connected with described power supply, and the second end of the first resistance unit 102 is connected with the first end of described first luminescence unit 104.The first end of the second resistance unit 103 is connected with described power supply, and the second end of the second resistance unit 103 is connected with the first end of described second luminescence unit 105.Preferably, the resistance of the first resistance unit 102 is equal with the resistance of the second resistance unit 103.
The first end of the first switch element 106 is connected with the second end of described first luminescence unit 104, and the second end of the first switch element 106 connects common electrical pressure side, and the control end of the first switch element 106 receives the first pwm control signal.First switch element 106 controls the first luminescence unit 104 when described first pwm control signal is in effective control level luminous.
The first end of second switch unit 107 is connected with the second end of described second luminescence unit 105, and the second end of second switch unit 107 connects common electrical pressure side, and the control end of second switch unit 107 receives the second pwm control signal.Second switch unit 107 controls the second luminescence unit when described second pwm control signal is in effective control level luminous.
As shown in Figure 2, described light emitting module also comprises power supply 101, first luminous component, the second luminous component, described first luminous component comprises the first resistance unit 102, first switch element 106 and the first luminescence unit 104 be sequentially connected in series, and described second luminous component comprises the second resistance unit 103, second switch unit 107 and the second luminescence unit 105 that are sequentially connected in series.
The first end of the first resistance unit 102 is connected with described power supply, and the second end of the first resistance unit 102 is connected with the first end of described first switch element 106.The first end of the second resistance unit 103 is connected with described power supply, and the second end of the second resistance unit 103 is connected with the first end of described second switch unit 107.Preferably, the resistance of the first resistance unit 102 is equal with the resistance of the second resistance unit 103.
Second end of the first switch element 106 is connected with the first end of the first luminescence unit 104, and the control end of the first switch element 106 receives the first pwm control signal, and the second end of the first luminescence unit 104 connects common electrical pressure side.First switch element 106 controls the first luminescence unit 104 when described first pwm control signal is in effective control level luminous.
Second end of second switch unit 107 is connected with the first end of the second luminescence unit 105, and the control end of second switch unit 107 receives the second pwm control signal, and the second end of the second luminescence unit 105 connects common electrical pressure side.Second switch unit 107 controls the second luminescence unit 105 when described second pwm control signal is in effective control level luminous.
Illustrate only two examples of light emitting module according to a first embodiment of the present invention in fig. 1 and 2.But, first embodiment of the invention is not limited thereto, first resistance unit 102, first luminescence unit 104, first switch element 106 can be connected between power supply 101 and common electrical pressure side with any sequential series, second resistance unit 103, second luminescence unit 105, second switch unit 107 can be connected between power supply 101 and common electrical pressure side with any sequential series, and the first resistance unit 102, the series sequence of the first luminescence unit 104 and the first switch element 106 can with the second resistance unit 103, second luminescence unit 105 is different with the series sequence of second switch unit 107.
Advantageously, first resistance unit 102 and the second resistance unit 103 have identical equivalent circuit structure, namely, the resistance of the first resistance unit 102 is identical with the resistance of the second resistance unit 103, first switch element 106 and second switch unit 107 have identical equivalent circuit structure, and the first luminescence unit 104 and the second luminescence unit 105 also have identical equivalent circuit structure.More advantageously, first resistance unit 102 and the second resistance unit 103 have identical/symmetrical circuit structure, first switch element 106 and second switch unit 107 have identical/symmetrical circuit structure, and the first luminescence unit 104 and the second luminescence unit 105 also have identical/symmetrical circuit structure.
There is the substantially identical working time (namely in order to make the first luminescence unit 104 in the first luminous component with the second luminescence unit 105 in the second luminous component, substantially identical degree of aging), advantageously, first pwm control signal is identical with the cycle of the second pwm control signal, and the first pwm control signal is also identical with the duration of effective control level of the second pwm control signal.
Effective control level of the first pwm control signal can be identical with effective control level of the second pwm control signal.Such as, the first pwm control signal and the second pwm control signal are both that high level is effective.In the case, the duration of effective control level of the first pwm control signal and the second pwm control signal can be equivalent to the dutycycle of the first pwm control signal and the second pwm control signal.Alternatively, the first pwm control signal and the second pwm control signal can be both Low level effective.
In the case, in order to make the luminosity of light emitting module according to a first embodiment of the present invention even, advantageously, first pwm control signal and the second pwm control signal phase 180 °, and the duration of effective control level of the first pwm control signal and the second pwm control signal be all less than the half in the cycle of the first pwm control signal and the second pwm control signal.The effective control level that figure 6 illustrates the first pwm control signal and the second pwm control signal is exemplary timing chart during high level.
Effective control level of the first pwm control signal can be different from effective control level of the second pwm control signal.Such as, the first pwm control signal is that high level is effective, and the second pwm control signal is Low level effective.In the case, the duration of effective control level of the first pwm control signal is equivalent to the duration of its high level, and the duration of effective control level of the second pwm control signal is equivalent to its low level duration, and vice versa.
In the case, in order to make the luminosity of light emitting module according to a first embodiment of the present invention even, advantageously, the start time phase of the start time of effective control level of the first pwm control signal and effective control level of the second pwm control signal 180 °, the end time phase place of the end time of effective control level of the first pwm control signal and effective control level of the second pwm control signal also differs 180 °, and the duration of effective control level of described first pwm control signal and the second pwm control signal is all less than the half in the cycle of described first pwm control signal and the second pwm control signal.
In addition, working time monitoring unit (not shown) and control module 110 can also be comprised in two examples of the light emitting module according to a first embodiment of the present invention shown in Fig. 1 and Fig. 2.
The working time of light emitting module described in working time monitoring unit record.Control module 110 receives the working time that described working time monitoring unit records, and based on the first control information table, adjust the duration of effective control level of described first pwm control signal and the second pwm control signal according to the received working time.
Know, the luminosity of the luminescent device that human eye is experienced is driven a current through time and the decision of drive current size of luminescent device in each cycle by luminescent device.Drive current size directly determines the instantaneous light emission brightness of luminescent device, and the time driving a current through luminescent device directly determines the fluorescent lifetime of luminescent device.That is, the fluorescent lifetime of luminosity by luminescent device luminescent device in each cycle of luminescent device experienced of human eye and the instantaneous light emission brightness decision of luminescent device.
But, along with the increase (that is, the increase of degree of aging) of luminescent device working time, the identical instantaneous light emission brightness reduction driving a current through luminescent device and produce.According to a first embodiment of the present invention, the identical instantaneous light emission brightness reduction driving a current through luminescent device and produce is compensated by extending the fluorescent lifetime of luminescent device in each cycle.
The working time of luminescent device and the corresponding relation of instantaneous light emission brightness under identical drive current can be obtained in advance, and correspondingly obtain the working time of luminescent device and the relation of the fluorescent lifetime of luminescent device in each cycle, can by such relational storage in described first control information table.Therefore, in light emitting module according to a first embodiment of the present invention, control module 110 is by reference to the first control information table, along with the working time of luminescent device increases (degree of aging increase), the identical instantaneous light emission brightness reduction driving a current through luminescent device and produce can be compensated by extending the fluorescent lifetime of luminescent device in each cycle, thus effectively improve display effect.
Below, in order to simplified characterization, be high level for effective control level of effective control level of the first pwm control signal and the second pwm control signal and launch to describe.
Such as, the initial duty cycle of the first pwm control signal and the second pwm control signal can be set to the first dutycycle (such as 20-30%), along with the increase of described light emitting module working time, increase the dutycycle of the first pwm control signal and the second pwm control signal gradually, until reach the first duty cycle threshold (such as lower than 50%).Such as, the dutycycle of the first pwm control signal and the second pwm control signal can be increased in units of year, every year the dutycycle of the first pwm control signal and the second pwm control signal be increased predetermined percentage.Advantageously, the dutycycle of the first pwm control signal and the second pwm control signal is all less than 50%, thus ensures that the fluorescent lifetime of the first luminescence unit 104 and the second luminescence unit 105 does not overlap each other.
Fig. 3 and Fig. 4 respectively illustrates the first example of light emitting module according to a second embodiment of the present invention and the schematic block diagram of the second example.
Light emitting module according to a second embodiment of the present invention, except comprising light emitting module according to a first embodiment of the present invention, also comprises the 3rd switch element 108.
The first end of the 3rd switch element 108 is connected with the first end of the first resistance unit 102, second end of the 3rd switch element 108 is connected with the second end of the first resistance unit 102,3rd end of the 3rd switch element 108 is connected with the first end of the second resistance unit 103,4th end of the 3rd switch element 108 is connected with the second end 104 of the second resistance unit, and the control end receiving key control signal of the 3rd switch element 108.
When described switch controlling signal is in effective control level, described 3rd switch element 108 connects the electrical connection between its first end and the second end and the electrical connection between its 3rd end and the 4th end.
Advantageously, circuit between 3rd end of the circuit between the first end of the 3rd switch element 108 and the second end and the 3rd switch element 108 and the 4th end has identical equivalent circuit structure, that is, the resistance existed between the first end of the 3rd switch element 108 and the second end equals the resistance existed between the 3rd end of the 3rd switch element 108 and the 4th end.More advantageously, the circuit between the first end of the 3rd switch element 108 and the second end and the circuit between the 3rd end of the 3rd switch element 108 and the 4th end have identical/symmetrical circuit structure.
As shown in Figure 3, described first luminous component comprises the first resistance unit 102, first luminescence unit 104 and the first switch element 106 be sequentially connected in series, and described second luminous component comprises the second resistance unit 103, second luminescence unit 105 and the second switch unit 107 be sequentially connected in series.Except adding the 3rd switch element 108, the light emitting module shown in Fig. 3 is identical with the light emitting module shown in Fig. 1, no longer repeats at this.
As shown in Figure 3, the first end (being also simultaneously the 3rd end) of the 3rd switch element 108 is connected with power supply 101, second end of the 3rd switch element 108 is connected with the first end of the first luminescence unit 104,4th end of the 3rd switch element 108 is connected with the second end of the second luminescence unit 105, and the control end of the 3rd switch element 108 receives described switch controlling signal.
As shown in Figure 4, described first luminous component comprises the first resistance unit 102, first switch element 106 and the first luminescence unit 104 be sequentially connected in series, and described second luminous component comprises the second resistance unit 103, second switch unit 107 and the second luminescence unit 105 that are sequentially connected in series.Except adding the 3rd switch element 108, the light emitting module shown in Fig. 4 is identical with the light emitting module shown in Fig. 2, no longer repeats at this.
As shown in Figure 4, the first end (being also simultaneously the 3rd end) of the 3rd switch element 108 is connected with power supply 101, second end of the 3rd switch element 108 is connected with the first end of the first switch element 106,4th end of the 3rd switch element 108 is connected with the second end of second switch unit 107, and the control end of the 3rd switch element 108 receives described switch controlling signal.
Illustrate only two examples of light emitting module according to a second embodiment of the present invention in figs. 3 and 4.But, second embodiment of the invention is not limited thereto, first resistance unit 102, first luminescence unit 104, first switch element 106 can be connected between power supply 101 and common electrical pressure side with any sequential series, second resistance unit 103, second luminescence unit 105, second switch unit 107 can be connected between power supply 101 and common electrical pressure side with any sequential series, and the first resistance unit 102, the series sequence of the first luminescence unit 104 and the first switch element 106 can with the second resistance unit 103, second luminescence unit 105 is different with the series sequence of second switch unit 107.And, the first end of the 3rd switch element 108 and the 3rd end can be different, as long as the first end of the 3rd switch element 108 is connected with the first end of the first resistance unit 102, the second end of the 3rd switch element 108 is connected with the second end of the first resistance unit 102, the 3rd end of the 3rd switch element 108 is connected with the first end of the second resistance unit 103, the 4th end of the 3rd switch element 108 is connected with the second end 104 of the second resistance unit.
Identical with first embodiment of the invention, in second embodiment of the invention, there is the substantially identical working time (namely in order to make the first luminescence unit 104 in the first luminous component with the second luminescence unit 105 in the second luminous component, degree of aging), advantageously, first pwm control signal is identical with the cycle of the second pwm control signal, and the first pwm control signal is also identical with the duration of effective control level of the second pwm control signal.
In addition, light emitting module according to a second embodiment of the present invention also comprises working time monitoring unit (not shown) and control module 110.
The working time of light emitting module described in working time monitoring unit record.Control module 110 receives the working time that described working time monitoring unit records, and based on the second control information table, exports described switch controlling signal according to the received working time.When the switch controlling signal that control module 110 exports is in effective control level, described 3rd switch element 108 connects the electrical connection between its first end and the second end and the electrical connection between its 3rd end and the 4th end.
In order to simplified characterization, below for effective control level of switch controlling signal for high level launch describe.
Such as, described second control information table can comprise the first working time threshold value (such as, 8 years, 10 years etc.), when the working time that described working time monitoring unit records is greater than described first working time threshold value, the switch controlling signal that described control module 110 exports is in high level.The control end of described 3rd switch element 108 receives the switch controlling signal of high level, connects the electrical connection between its first end and the second end and the electrical connection between its 3rd end and the 4th end.
Again such as, described second control information table can comprise the first working time threshold value (such as, 7 years, 8 years etc.) and the second working time threshold value (such as 10 years, 12 years etc.), first working time threshold value is less than the second working time threshold value, the switch controlling signal that described control module 110 exports can comprise the first switch controlling signal and second switch control signal, and the control end of described 3rd switch element can comprise the first control end for receiving described first control signal and the second control end for receiving described second control signal.
In the case, when the working time that described working time monitoring unit records is greater than described first working time threshold value and is less than described second working time threshold value, described first control signal is in high level, described second control signal is in low level, the first resistance is there is between the first end and the second end of described 3rd switch element, the first electric current can be flow through between the first end and the second end of the 3rd switch element, thus add the electric current flowing through the first luminescence unit; Between the 3rd end and the 4th end of described 3rd switch element, also there is the first resistance, between the 3rd end and the 4th end of the 3rd switch element, also can flow through the first electric current, thus too increase the electric current flowing through the second luminescence unit.
In the case, when the working time that described working time monitoring unit records is greater than described second working time threshold value, described second control signal is in high level, the second resistance is there is between the first end and the second end of described 3rd switch element, between the 3rd end and the 4th end of described 3rd switch element, there is the second resistance, and the first resistance is greater than the second resistance.Now, the second electric current can be flow through between the first end and the second end of the 3rd switch element, thus add the electric current flowing through the first luminescence unit; Between the 3rd end and the 4th end of the 3rd switch element, also can flow through the second electric current, thus too increase the electric current flowing through the second luminescence unit, and the second electric current is greater than the first electric current.In other words, along with the increase of light emitting module working time, controllably the drive current of luminescence unit is flow through in segmentation increase, thus the problem that the instantaneous light emission brightness compensating the identical drive current generation caused because luminescence unit is aging declines.
In addition, when the working time that described working time monitoring unit records is greater than described second working time threshold value, described first control signal can be in high level, also low level can be in, as long as ensure that the second resistance existed between the first end and the second end of described 3rd switch element is in the case less than described first resistance.
In addition, in light emitting module according to a second embodiment of the present invention, control module 110 based on the first control information table, can also adjust the duration of effective control level of described first pwm control signal and the second pwm control signal according to the received working time.
Such as, when the working time of light emitting module is shorter than the first working time threshold value, control module 110 is based on the first control information table, adjust the duration (i.e. dutycycle) of the high level of described first pwm control signal and the second pwm control signal according to the received working time, thus realize the compensation to the degree of aging of light emitting module.
Along with the working time of light emitting module increases, the dutycycle of the first pwm control signal and the second pwm control signal also increases gradually, and gradually close to duty cycle threshold (such as 50%).
When the working time of light emitting module reaches the first working time threshold value, the dutycycle of the first pwm control signal and the second pwm control signal also closer to or reach duty cycle threshold, control module 110 starts the switch controlling signal exporting high level, the 3rd switch element 108 is made to start to provide the first electric current respectively to the first luminescence unit 104 and the second luminescence unit 105, flow through the first luminescence unit 104 and the respective drive current of the second luminescence unit 105 to increase, thus further realize the compensation of the degree of aging to light emitting module.
In the first control information table, may there is downward saltus step in the dutycycle of the pwm control signal before and after the first working time threshold value.Such as, consider that the first working time threshold value is 10 years, in the first control information table, the dutycycle of the pwm control signal corresponding with the first working time threshold value may be 45%, but the dutycycle of the pwm control signal corresponding with 11 years working times may be 30%, this is owing to each providing the first electric current to the first luminescence unit 104 and the second luminescence unit 105 extraly by the 3rd switch element 108.
Can arrange the first control information table and the second control information table according to test or experience, the present invention is not subject to the restriction of the form of the first control information table and the second control information table.
Illustrate a kind of sample implementation of the light emitting module shown in Fig. 3 in Figure 5.
As shown in Figure 5, first resistance unit 102 comprises resistance R11 and R12 be connected in parallel, first switch element 106 comprises transistor T11 and resistance R191 and R192, the grid of transistor T11 receives the first pwm control signal by R191, the source electrode of transistor T11 and common electrical press bond, common electrical pressure side can be ground level, and the drain electrode of transistor T11 connects the second end of the first luminescence unit 104.
As shown in Figure 5, second resistance unit 103 comprises resistance R21 and R22 be connected in parallel, second switch unit 107 comprises transistor T21 and resistance R291 and R292, the grid of transistor T21 receives the second pwm control signal by R291, the source electrode of transistor T21 and common electrical press bond, the drain electrode of transistor T21 connects the second end of the second luminescence unit 105.
As shown in Figure 5, the 3rd switch element 108 comprises Part I and Part II, and Part I is connected to the first resistance unit, and Part II is connected to the second resistance unit.Part I comprises transistor T12 and T13, resistance R13, R14, R15, R16, R17 and R18, and Part II comprises transistor T22 and T23, resistance R23, R24, R25, R26, R27 and R28.
Transistor T11, T12, T13, T21, T22 and T23 can be metal-oxide-semiconductor, triode etc.As shown in Figure 5, transistor T13 and T23 is NMOS tube, and transistor T12 and T22 is PMOS, and transistor T11 and T21 is NMOS tube.But the present invention is not limited thereto, according to specific implementation, transistor T11, T12, T13, T21, T22 and T23 can have different implementations.
When the first pwm control signal is in low level (invalid control level), T11 ends, and do not drive a current through the first luminescence unit, the first luminescence unit is not luminous.When the first pwm control signal is in high level (effective control level), T11 conducting, drives a current through the first luminescence unit, and the first luminescence unit is luminous.
When the second pwm control signal is in low level (invalid control level), T21 ends, and do not drive a current through the second luminescence unit, the second luminescence unit is not luminous.When the second pwm control signal is in high level (effective control level), T21 conducting, drives a current through the second luminescence unit, and the second luminescence unit is luminous.
When switch controlling signal is in low level (invalid control level), T13, T12, T23 and T22 all end, and the 3rd switch element 108 does not provide electric current to the first luminescence unit 104 and the second luminescence unit 105 thus.
When switch controlling signal is in high level (effective control level), the equal conducting of T13, T12, T23 and T22, the 3rd switch element 108 provides electric current to the first luminescence unit 104 and the second luminescence unit 105 extraly thus.
Although give a kind of specific implementation of the 3rd switch element 108 in Figure 5, but the present invention is not limited thereto, those skilled in the art can conceive other implementation of acquisition based on the present invention.Such as, the 3V(high level that control module 110 exports by amplifying circuit or booster circuit can be utilized) switch controlling signal is transformed to the voltage of such as 8V, and is applied to the grid of transistor T12, thus control T12 conducting.In the case, T12 also can be NMOS tube, and the drain electrode of T12 connects power supply, and the source electrode of T12 connects the second end of the first resistance unit.In addition, the first switch element 106 is also not limited to the implementation shown in Fig. 5, and the change of effective control level along with the first pwm control signal, also can adopt PMOS.
In embodiments of the present invention, the first luminescence unit and the second luminescence unit can comprise LED component as luminescent device.It will be understood by a person skilled in the art that, the first luminescence unit and the second luminescence unit can also comprise there is the similar characteristics of luminescence device as luminescent device.
The driving method of the light emitting module according to the embodiment of the present invention is described below with reference to Fig. 7-Figure 10.
With reference to figure 1, Fig. 2 and Fig. 7, light emitting module driving method 700 is according to a first embodiment of the present invention described.
In step S710, the control end of the first switch element receives the first pwm control signal, and control the first luminescence unit when described first pwm control signal is in effective control level luminous.
In step S720, the control end of second switch unit receives the second pwm control signal, and control the second luminescence unit when described second pwm control signal is in effective control level luminous.
Under the control of described first pwm control signal and the second pwm control signal, realize described first luminescence unit and described second luminescence unit is alternately luminous.By reasonably arranging the cycle of the first pwm control signal and the second pwm control signal, the such as cycle is less than 10ms, makes human eye perceives less than the flicker of the first luminescence unit and the second luminescence unit, can extend the serviceable life of light emitting module to a certain extent.
With reference to figure 1, Fig. 2 and Fig. 8, light emitting module driving method 800 is according to a second embodiment of the present invention described.
In step S810, by the working time of working time monitoring unit record light emitting module.
In step S820, based on the first control information table, control module adjusts the duration of effective control level of described first pwm control signal and the second pwm control signal according to the received working time.Described first control information table stores the corresponding relation of the duration of effective control level of working time and described first and second pwm control signals.
In step S830, the control end of the first switch element receives the first pwm control signal, and control the first luminescence unit when described first pwm control signal is in effective control level luminous.
In step S840, the control end of second switch unit receives the second pwm control signal, and control the second luminescence unit when described second pwm control signal is in effective control level luminous.
By adjusting the duration of effective control level of described first pwm control signal and the second pwm control signal according to the received working time, namely, along with the increase of working time, increase the duration of effective control level of the first pwm control signal and the second pwm control signal according to predetermined relationship, the working time that can compensate due to luminescent device increases the luminescent device instantaneous light emission brightness that the identical drive current that causes produces and reduces.
With reference to figure 1, Fig. 2 and Fig. 9, light emitting module driving method 900 is according to a third embodiment of the present invention described.
In step S910, by the working time of working time monitoring unit record light emitting module.
In step S920, based on the second control information table, control module is according to received working time output switch control signal.
In step S930, the control end of the 3rd switch element receives described switch controlling signal, when described switch controlling signal is in effective control level, described 3rd switch element connects the electrical connection between its first end and the second end and the electrical connection between its 3rd end and the 4th end, and the resistance existed between its first end and the second end equals the resistance that exists between its 3rd end and the 4th end.
In step S940, the control end of the first switch element receives the first pwm control signal, and control the first luminescence unit when described first pwm control signal is in effective control level luminous.
In step S950, the control end of second switch unit receives the second pwm control signal, and control the second luminescence unit when described second pwm control signal is in effective control level luminous.
By controlling the first end of connection the 3rd switch element and the second end according to the received working time and connecting the 3rd end and the 4th end of the 3rd switch element, namely, when the working time of light emitting module more than the first working time threshold value time, there is provided electric current to the first luminescence unit and the second luminescence unit extraly by the 3rd switch element, thus the working time that can compensate due to luminescent device increases the luminescent device instantaneous light emission brightness that the identical drive current that causes produces reduces.
With reference to figure 1, Fig. 2 and Figure 10, light emitting module driving method 1000 is according to a fourth embodiment of the present invention described.
In step S1010, by the working time of working time monitoring unit record light emitting module.
In step S1020, based on the second control information table, control module is according to received working time output switch control signal.
In step S1030, the control end of the 3rd switch element receives described switch controlling signal, when described switch controlling signal is in effective control level, described 3rd switch element connects the electrical connection between its first end and the second end and the electrical connection between its 3rd end and the 4th end, and the resistance existed between its first end and the second end equals the resistance that exists between its 3rd end and the 4th end.
In step S1040, based on the first control information table, control module adjusts the duration of effective control level of described first pwm control signal and the second pwm control signal according to the received working time.Described first control information table stores the corresponding relation of the duration of effective control level of working time and described first and second pwm control signals.
In step S1050, the control end of the first switch element receives the first pwm control signal, and control the first luminescence unit when described first pwm control signal is in effective control level luminous.
In step S1060, the control end of second switch unit receives the second pwm control signal, and control the second luminescence unit when described second pwm control signal is in effective control level luminous.
Driving method according to a fourth embodiment of the present invention, on the one hand by controlling the first end of connection the 3rd switch element and the second end according to the received working time and connecting the 3rd end and the 4th end of the 3rd switch element, namely, when the working time of light emitting module more than the first working time threshold value time, provide electric current to the first luminescence unit and the second luminescence unit extraly by the 3rd switch element; On the other hand by adjusting the duration of effective control level of described first pwm control signal and the second pwm control signal according to the received working time, namely, along with the increase of working time, increase the duration of effective control level of the first pwm control signal and the second pwm control signal according to predetermined relationship, the working time that can compensate better due to luminescent device increases the luminescent device luminosity that the identical drive current that causes produces and reduces.
Light emitting module according to the embodiment of the present invention and control method thereof have been described with reference to the drawings above.It will be understood by a person skilled in the art that, the invention is not restricted to above-described embodiment, can make various amendment when not departing from spirit of the present invention, described amendment also should be included within the scope of the present invention.Scope of the present invention should be limited by claims and equivalent thereof.
Claims (14)
1. a light emitting module, comprising:
Power supply, for providing supply voltage;
First luminous component, it comprises the first resistance unit, the first switch element and the first luminescence unit that are connected in series, and the first end of this first luminous component is connected with described power supply, the second end of this first luminous component and common electrical press bond; And
Second luminous component, it comprises the second resistance unit, second switch unit and the second luminescence unit that are connected in series, and the first end of this second luminous component is connected with described power supply, the second end of this second luminous component and described common electrical press bond,
Wherein, the control end of the first switch element receives the first pwm control signal, and control the first luminescence unit when described first pwm control signal is in effective control level luminous,
The control end of second switch unit receives the second pwm control signal, and control the second luminescence unit when described second pwm control signal is in effective control level luminous, and
Under the control of described first pwm control signal and the second pwm control signal, described first luminescence unit and described second luminescence unit are alternately luminous.
2. light emitting module as claimed in claim 1, wherein,
The resistance of the first resistance unit is identical with the resistance of the second resistance unit,
Described first pwm control signal is identical with the cycle of the second pwm control signal, and described first pwm control signal is identical with the duration of effective control level of the second pwm control signal.
3. light emitting module as claimed in claim 1, wherein, described first pwm control signal and the second pwm control signal phase 180 °, and the duration of effective control level of described first pwm control signal and the second pwm control signal be all less than the half in the cycle of described first pwm control signal and the second pwm control signal.
4. light emitting module as claimed in claim 1, also comprises:
Working time monitoring unit, for recording the working time of described light emitting module; And
Control module, for receiving the working time that described working time monitoring unit records, and based on the first control information table, adjust the duration of effective control level of described first pwm control signal and the second pwm control signal according to the received working time
Wherein, described first control information table stores the corresponding relation of the duration of effective control level of working time and described first and second pwm control signals.
5. light emitting module as claimed in claim 1, also comprises:
Working time monitoring unit, for recording the working time of described light emitting module;
Control module, for receiving the working time that described working time monitoring unit records, and based on the second control information table, according to received working time output switch control signal; And
Described 3rd switch element, its first end and the second end are connected with the first end of described first resistance unit and the second end respectively, its the 3rd end and the 4th end are connected with the first end of described second resistance unit and the second end respectively, and its control end receives described switch controlling signal
Wherein, when described switch controlling signal is in effective control level, described 3rd switch element connects the electrical connection between its first end and the second end and the electrical connection between its 3rd end and the 4th end, and the resistance existed between its first end and the second end equals the resistance that exists between its 3rd end and the 4th end.
6. light emitting module as claimed in claim 5, wherein,
Wherein, described control module, also based on the first control information table, adjusts the duration of effective control level of described first pwm control signal and the second pwm control signal according to the received working time,
Wherein, described first control information table stores the corresponding relation of the duration of effective control level of working time and described first and second pwm control signals.
7. light emitting module as claimed in claim 5, wherein, described second control information table comprises the first working time threshold value, when the working time that described working time monitoring unit records is greater than described first working time threshold value, the switch controlling signal that described control module exports is in effective control level.
8. light emitting module as claimed in claim 5, wherein, described second control information table comprises the first working time threshold value and the second working time threshold value, the switch controlling signal that described control module exports comprises the first switch controlling signal and second switch control signal, the control end of described 3rd switch element comprises the first control end for receiving described first control signal and the second control end for receiving described second control signal
When the working time that described working time monitoring unit records is greater than described first working time threshold value and is less than described second working time threshold value, described first control signal is in effective control level, described second control signal is in invalid control level, between the first end and the second end of described 3rd switch element, there is the first resistance, between the 3rd end and the 4th end of described 3rd switch element, there is the first resistance;
When the working time that described working time monitoring unit records is greater than described second working time threshold value, described second control signal is in effective control level, the second resistance is there is between the first end and the second end of described 3rd switch element, between the 3rd end and the 4th end of described 3rd switch element, there is the second resistance, and the first resistance is greater than the second resistance.
9. the control method of a light emitting module, described light emitting module comprises power supply, the first luminous component and the second luminous component, described first luminous component comprises the first resistance unit, the first switch element and the first luminescence unit that are connected in series, described second luminous component comprises the second resistance unit, second switch unit and the second luminescence unit that are connected in series, described first luminous component be all connected with described power supply with the first end of the second luminous component and its second end all with common electrical press bond, described control method comprises:
The control end of the first switch element receives the first pwm control signal, and control the first luminescence unit when described first pwm control signal is in effective control level luminous,
The control end of second switch unit receives the second pwm control signal, and control the second luminescence unit when described second pwm control signal is in effective control level luminous,
Wherein, under the control of described first pwm control signal and the second pwm control signal, described first luminescence unit and described second luminescence unit are alternately luminous.
10. control method as claimed in claim 9, wherein, the resistance of the first resistance unit is identical with the resistance of the second resistance unit,
Described first pwm control signal is identical with the cycle of the second pwm control signal, described first pwm control signal and the second pwm control signal phase 180 °,
Described first pwm control signal is identical with the duration of effective control level of the second pwm control signal, and is all less than the half in the cycle of described first pwm control signal and the second pwm control signal.
11. control methods as claimed in claim 9, also comprise:
Record the working time of described light emitting module; And
Based on the first control information table, adjust the duration of effective control level of described first pwm control signal and the second pwm control signal according to the received working time,
Wherein, described first control information table stores the corresponding relation of the duration of effective control level of working time and described first and second pwm control signals.
12. control methods as claimed in claim 9, wherein, described light emitting module also comprises the 3rd switch element, its first end is connected with the first end of described first resistance unit, its second end is connected with the second end of described first resistance unit, its the 3rd end is connected with the first end of described second resistance unit, and its 4th end is connected with the second end of described second resistance unit
Described control method also comprises:
Record the working time of described light emitting module;
Based on the second control information table, according to received working time output switch control signal;
And
The control end of described 3rd switch element receives described switch controlling signal, when described switch controlling signal is in effective control level, described 3rd switch element connects the electrical connection between its first end and the second end and the electrical connection between its 3rd end and the 4th end, and the resistance existed between its first end and the second end equals the resistance that exists between its 3rd end and the 4th end.
13. control methods as claimed in claim 12, also comprise:
Based on the first control information table, adjust the duration of effective control level of described first pwm control signal and the second pwm control signal according to the received working time,
Wherein, described first control information table stores the corresponding relation of the duration of effective control level of working time and described first and second pwm control signals.
14. control methods as claimed in claim 12, wherein, described second control information table comprises the first working time threshold value, when the working time that described working time monitoring unit records is greater than described first working time threshold value, the switch controlling signal that described control module exports is in effective control level.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107886891A (en) * | 2017-11-08 | 2018-04-06 | 东莞市闻誉实业有限公司 | Flip displays method |
| CN107945744A (en) * | 2017-11-15 | 2018-04-20 | 维沃移动通信有限公司 | Display screen saturation degree method of adjustment, mobile terminal and computer-readable recording medium |
| CN108668525A (en) * | 2017-01-30 | 2018-10-16 | 新电元工业株式会社 | The manufacturing method of LED control devices and LED control devices |
| CN112068350A (en) * | 2020-07-16 | 2020-12-11 | 阿纳克斯（苏州）轨道系统有限公司 | Backlight structure and method for prolonging service life of LED display |
| CN112435625A (en) * | 2019-08-06 | 2021-03-02 | 隆达电子股份有限公司 | Pixel circuit and driving method |
| CN112530363A (en) * | 2020-12-02 | 2021-03-19 | Tcl华星光电技术有限公司 | Display panel and driving method thereof |
| TWI754478B (en) * | 2020-06-10 | 2022-02-01 | 友達光電股份有限公司 | Pixel circuit |
| TWI756927B (en) * | 2020-09-29 | 2022-03-01 | 中強光電股份有限公司 | Driving device and driving method for backlight module |
| CN114255710A (en) * | 2021-11-12 | 2022-03-29 | 安徽四季电子科技有限公司 | Backlight switching processing method and device for multi-light-source system and backlight system |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1702711A (en) * | 2004-05-25 | 2005-11-30 | 三星Sdi株式会社 | Display and driving method thereof |
| CN1797521A (en) * | 2004-12-29 | 2006-07-05 | 普诚科技股份有限公司 | Two segments type drive circuit for faceplate of organic LED |
| CN101465348A (en) * | 2007-12-19 | 2009-06-24 | 台达电子工业股份有限公司 | LED encapsulation module capable of reducing operation temperature |
| JP2010050010A (en) * | 2008-07-24 | 2010-03-04 | Nippon Seiki Co Ltd | Lighting device |
| CN101848575A (en) * | 2009-03-25 | 2010-09-29 | 华映视讯（吴江）有限公司 | Driving circuit for backlight system of light-emitting diode |
| CN102065596A (en) * | 2009-11-12 | 2011-05-18 | 冠捷投资有限公司 | Driving device for light emitting diode backlight |
| KR20120108709A (en) * | 2011-03-25 | 2012-10-05 | 전자부품연구원 | Driving method for light emitting diode using a current comparator and driving circuit operating based on the same |
-
2013
- 2013-06-25 CN CN201310254926.9A patent/CN104252847B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1702711A (en) * | 2004-05-25 | 2005-11-30 | 三星Sdi株式会社 | Display and driving method thereof |
| CN1797521A (en) * | 2004-12-29 | 2006-07-05 | 普诚科技股份有限公司 | Two segments type drive circuit for faceplate of organic LED |
| CN101465348A (en) * | 2007-12-19 | 2009-06-24 | 台达电子工业股份有限公司 | LED encapsulation module capable of reducing operation temperature |
| JP2010050010A (en) * | 2008-07-24 | 2010-03-04 | Nippon Seiki Co Ltd | Lighting device |
| CN101848575A (en) * | 2009-03-25 | 2010-09-29 | 华映视讯（吴江）有限公司 | Driving circuit for backlight system of light-emitting diode |
| CN102065596A (en) * | 2009-11-12 | 2011-05-18 | 冠捷投资有限公司 | Driving device for light emitting diode backlight |
| KR20120108709A (en) * | 2011-03-25 | 2012-10-05 | 전자부품연구원 | Driving method for light emitting diode using a current comparator and driving circuit operating based on the same |
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108668525A (en) * | 2017-01-30 | 2018-10-16 | 新电元工业株式会社 | The manufacturing method of LED control devices and LED control devices |
| CN108668525B (en) * | 2017-01-30 | 2020-05-05 | 新电元工业株式会社 | LED control device and method for manufacturing LED control device |
| CN107886891A (en) * | 2017-11-08 | 2018-04-06 | 东莞市闻誉实业有限公司 | Flip displays method |
| CN107945744A (en) * | 2017-11-15 | 2018-04-20 | 维沃移动通信有限公司 | Display screen saturation degree method of adjustment, mobile terminal and computer-readable recording medium |
| CN107945744B (en) * | 2017-11-15 | 2019-10-18 | 维沃移动通信有限公司 | Display screen saturation degree method of adjustment, mobile terminal and computer readable storage medium |
| US11132936B2 (en) | 2019-08-06 | 2021-09-28 | Lextar Electronics Corporation | Pixel circuit and driving method |
| CN112435625A (en) * | 2019-08-06 | 2021-03-02 | 隆达电子股份有限公司 | Pixel circuit and driving method |
| CN112435625B (en) * | 2019-08-06 | 2022-03-15 | 隆达电子股份有限公司 | Pixel circuit and driving method |
| US11495169B2 (en) | 2019-08-06 | 2022-11-08 | Lextar Electronics Corporation | Pixel circuit |
| TWI754478B (en) * | 2020-06-10 | 2022-02-01 | 友達光電股份有限公司 | Pixel circuit |
| CN112068350A (en) * | 2020-07-16 | 2020-12-11 | 阿纳克斯（苏州）轨道系统有限公司 | Backlight structure and method for prolonging service life of LED display |
| CN112068350B (en) * | 2020-07-16 | 2023-03-14 | 阿纳克斯（苏州）轨道系统有限公司 | Backlight structure and method for prolonging service life of LED display |
| TWI756927B (en) * | 2020-09-29 | 2022-03-01 | 中強光電股份有限公司 | Driving device and driving method for backlight module |
| CN112530363A (en) * | 2020-12-02 | 2021-03-19 | Tcl华星光电技术有限公司 | Display panel and driving method thereof |
| WO2022116292A1 (en) * | 2020-12-02 | 2022-06-09 | Tcl华星光电技术有限公司 | Display panel and driving method therefor |
| US11735100B2 (en) | 2020-12-02 | 2023-08-22 | Tcl China Star Optoelectronics Technology Co., Ltd. | Display panel and driving method thereof |
| CN114255710A (en) * | 2021-11-12 | 2022-03-29 | 安徽四季电子科技有限公司 | Backlight switching processing method and device for multi-light-source system and backlight system |
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