CN105528998A - Background light driving module and electronic device - Google Patents
Background light driving module and electronic device Download PDFInfo
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- CN105528998A CN105528998A CN201410510438.4A CN201410510438A CN105528998A CN 105528998 A CN105528998 A CN 105528998A CN 201410510438 A CN201410510438 A CN 201410510438A CN 105528998 A CN105528998 A CN 105528998A
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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
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Abstract
The invention provides a background light driving module and an electronic device. The electronic device comprises the background light driving module and a first control module, wherein the background light driving module is configured to drive a background light source; and the first control module is configured to generate control information and send the control information to the background light driving module. The background light driving module comprises a receiving unit and a second control unit, wherein the receiving unit is configured to receive the control information; and the second control unit is configured to control action parameters while the background light driving module acts based on the control information.
Description
Technical field
The present invention relates to bias light driver module and electronic equipment.
Background technology
In the electronic equipment of such as mobile phone, panel computer, notebook computer, digital camera, notebook computer etc., possesses the display screen for display graphics user interface.In such as LCD display, screen itself is not luminous, launches bias light, thus clearly illustrate graphic user interface by the background light source be such as made up of LED.Further, by bias light driver module, background light source is driven.
In the bias light driver module of such as bias light driving chip etc., in the voltage conversion unit of boosting unit etc., there is the on-off element of metal-oxide-semiconductor etc.Under the state that background light source is in heavy duty (high brightness), conduction loss is large, and the higher then efficiency of frequency of operation is higher.Otherwise under the state that background light source is in underload (low-light level), switching loss is large, and the lower then efficiency of frequency of operation is higher.Therefore, in bias light driver module, the load according to background light source changes, the frequency of operation of change-over switch element, makes bias light driver module remain on high efficiency.
In addition, in the bias light driver module of such as bias light driving chip etc., good efficiency can be obtained when carrying out Current Control output, but easily produce colour cast when background light source electric current little especially (low-light level).Otherwise when carrying out PWM and exporting, although can not produce colour cast when low-light level, its efficiency exports lower than Current Control.Therefore, in bias light driver module, the load according to background light source changes, and switches the way of output of bias light driver module, makes the colour cast can either eliminated when low-light level also can keep high efficiency.
But, in existing bias light driver module, the switching point of the frequency of operation of such as on-off element and the switching point of PWM output and Current Control output cannot be adjusted, therefore cannot suitably adjust the switching point of frequency of operation and the switching point of the way of output according to concrete application scenarios, thus the efficiency of bias light driver module cannot remain on good state or cause the output mode of bias light driver module may be not suitable for concrete application scenarios.
Summary of the invention
The present invention completes in view of the above problems, its object is to, a kind of bias light driver module and the electronic equipment comprising this bias light driver module are provided, the action parameter that suitably can control when bias light driver module carries out action according to concrete application scenarios, thus bias light driver module is remained on good state.
According to an aspect of the present invention, a kind of bias light driver module is provided.Described bias light driver module comprises: receiving element, and configuration carrys out receiving control information; Control module, configuration comes based on described control information, controls action parameter when described bias light driver module carries out action.
According to a further aspect in the invention, a kind of electronic equipment is provided.Described electronic equipment comprises bias light driver module, and configuration drives background light source; First control module, configuration generates control information, and sends to described bias light driver module.Wherein, described bias light driver module comprises: receiving element, and configuration receives described control information; Second control module, configuration comes based on described control information, controls action parameter when described bias light driver module carries out action.
According to bias light driver module of the present invention and electronic equipment, the action parameter that suitably can control when bias light driver module carries out action according to concrete application scenarios, thus bias light driver module is remained on good state.
Accompanying drawing explanation
Fig. 1 is the functional block diagram illustrating bias light driver module of the prior art.
Fig. 2 is the functional block diagram comprising the electronic equipment of bias light driver module representing embodiments of the present invention.
Embodiment
Below, the specific embodiment of the present invention is illustrated with reference to accompanying drawing.There is provided the description referring to accompanying drawing, to help the understanding to the example embodiment of the present invention limited by claim and equivalent thereof.It comprises the various details helping to understand, but they can only be counted as exemplary.Therefore, those skilled in the art will recognize that, can make various changes and modifications embodiment described herein, and do not depart from the scope of the present invention and spirit.And, in order to make instructions clearly succinct, will the detailed description to well known function and structure be omitted.
First, with reference to Fig. 1, bias light driver module of the prior art is described.Fig. 1 is the functional block diagram of the bias light driver module illustrating prior art.
Bias light driver module 1 shown in Fig. 1 comprises voltage conversion unit 11, current output unit 12, detecting unit 13 and control module 14.Particularly, bias light driver module 1 is made up of bias light driving chip and peripheral cell (inductance, electric capacity etc.).
Voltage conversion unit 11 boosts to the input voltage from battery etc., thus is driven background light source by the output voltage after boosting.Comprise the on-off element of metal-oxide-semiconductor etc. at voltage conversion unit 11, this on-off element can carry out switch motion with one of them frequency in multiple frequency.Current output unit 12 drives background light source with the first output mode or the second output mode.Particularly, current output unit 12 such as drives background light source with Current Control output mode or PWM (pulse-length modulation) output mode.The electric current of detecting unit 13 detection background light source, and the current value detected is sent to control module 14.One end of background light source is connected to voltage conversion unit 11, and the other end is connected to current output unit 12, thus accepts the driving of bias light driver module 1.
Control module 14 is according to the monochrome information of the outside from bias light driver module 1, control the drive current (such as controlling dutycycle when output voltage values, output current value, PWM output) driven by voltage conversion unit 11 and current output unit 12 pairs of background light sources, make background light source with the brightness emission bias light represented by monochrome information.
On the other hand, control module 14 is according to the current value detected by detecting unit 13, and control bias light driver module carries out action parameter during action.Such as, control module 14 is according to the current value detected by detecting unit 13, and the on-off element in switched voltage converting unit 11 carries out frequency during switch motion.For another example, control module 14 according to the current value detected by detecting unit 13, the output mode of switch current output unit 12.
Particularly, when the current value detected by detecting unit 13 is more than or equal to threshold value, the frequency error factor that on-off element in voltage conversion unit 11 is carried out switch motion by control module 14 is relatively high frequency, otherwise, when the current value detected by detecting unit 13 is less than threshold value, the frequency error factor that the on-off element in voltage conversion unit 11 is carried out switch motion by control module 14 is relatively low frequency.Thus, bias light driver module is remained on high efficiency.Wherein, more threshold value can be set, thus suitably be switched to a frequency in more frequency according to the current value detected.
Particularly, when the current value detected by detecting unit 13 is more than or equal to threshold value, the output mode of current output unit 12 is switched to Current Control output mode by control module 14, thus ensures higher efficiency.Otherwise when the current value detected by detecting unit 13 is less than threshold value, the output mode of current output unit 12 is switched to PWM output mode by control module 14, thus overcome the colour cast problem when background light source is in low load.
Wherein, the content, different from the content controlled according to the current value that detects that controls according to monochrome information of control module 14.The content that control module 14 controls according to monochrome information, relevant with the drive current of background light source, the dutycycle etc. when therefore exporting the output voltage values of voltage conversion unit 11 and current output unit 12, output current value, PWM controls.In other words, control module 14 controls according to the drive current of monochrome information to background light source, and therefore final control object is the brightness of background light source.But, the content that control module 14 controls according to the current value detected by detecting unit 13, relevant with the action parameter of bias light driver module 1, the performance (increase efficiency, overcome the problem of colour cast) of bias light driver module can be improved thus.In other words, control module 14 controls the action parameter in bias light driver module according to the current value detected.
As mentioned above, in the bias light driver module 1 of prior art, about the action parameter of bias light driver module 1, undertaken from main control (that is, the electric current detected according to self controls) by control module 14.In the bias light driving chip forming bias light driver module 1, about being fixed from main control logic of action parameter of bias light driver module 1.Thus, in the bias light driver module 1 of prior art, the action parameter of the switching point (threshold value) of the frequency of operation of such as on-off element and the switching point (threshold value) of PWM output and Current Control output etc. cannot be adjusted according to concrete application scenarios.Wherein, according to concrete application scenarios, the optimal value change of the switching point of the optimal value of the switching point of the frequency of operation of on-off element as above and PWM output and Current Control output, but when being fixed from main control logic of the action parameter about bias light driver module 1, dynamically and neatly above-mentioned switching point cannot be changed.Thus, in concrete application scenarios, above-mentioned switching point may not be set in optimal value.
The bias light driver module of embodiments of the present invention comprises: receiving element, and configuration carrys out receiving control information; Control module, configuration comes based on described control information, controls action parameter when described bias light driver module carries out action.In addition, the electronic equipment of embodiments of the present invention comprises configuration and generates control information and send to the control module of bias light driver module and configure the bias light driver module that drives background light source.Thus, the action parameter that suitably can control when bias light driver module carries out action according to concrete application scenarios, can dynamically and neatly the frequency of operation of alternation switch element switching point and PWM exports and the switching point etc. of Current Control output, thus bias light driver module is remained on good state.
Below, the bias light driver module of embodiments of the present invention is described with reference to Fig. 2 and comprises the electronic equipment of this bias light driver module.
Fig. 2 is the functional block diagram comprising the electronic equipment of bias light driver module representing embodiments of the present invention.
As shown in Figure 2, electronic equipment comprises control module 2, bias light driver module 1A and background light source.
Control module 2 configuration generates control information, and sends to bias light driver module 1A.This control information is used to control the action parameter when bias light driver module carries out action in bias light driver module 1A.
Wherein, the content of control information can at random be generated as required.Such as, control information represents the frequency of carrying out switch motion for change-over switch element, also can represent the output mode of current output unit, but be not limited to this, can at random generate as required.
Bias light driver module 1A configuration drives background light source.As shown in Figure 2, bias light driver module 1A comprises voltage conversion unit 11, current output unit 12, control module 14A and receiving element 15.
Wherein, voltage conversion unit 11 is identical with the bias light driver module 1 of the prior art shown in Fig. 1 with the function of current output unit 12.Such as, voltage conversion unit 11 boosts to the input voltage from battery etc., thus is driven background light source by the output voltage after boosting.Comprise the on-off element of metal-oxide-semiconductor etc. at voltage conversion unit 11, this on-off element can carry out switch motion with one of them frequency in multiple frequency.Current output unit 12 drives background light source with the first output mode or the second output mode.Such as, current output unit 12 such as drives background light source with Current Control output mode or PWM (pulse-length modulation) output mode.One end of background light source is connected to voltage conversion unit 11, and the other end is connected to current output unit 12, thus accepts the driving of bias light driver module 1A.
Receiving element 15 receives the control information of sending from control module 2.Such as, this control information can be sent by I2C bus between receiving element 15 and control module 2, but be not limited to this, also can send this control information in other way.
Control module 14A is based on the control information received by receiving element 15, and control bias light driver module 1A carries out action parameter during action.
Particularly, when the control information that control module 2 generates represents the frequency of the on-off element that voltage conversion unit 11 comprises, control module 14A is based on this control information, and change-over switch element carries out the frequency of switch motion.
Such as, in control module 2, generate control information based on user for the configuration information of background light source.Such as, control module 2 obtains the configuration information of the brightness for background light source, and generates suitable control information according to this configuration information.When the brightness of background light source is set to high, can thinks that the electric current of background light source is large, therefore in order to improve the efficiency of bias light driver module 1A, generating the control information of the frequency representing relatively high.Otherwise, when being set to low by the brightness of background light source, can thinking that the electric current of background light source is little, therefore in order to improve the efficiency of bias light driver module 1A, generating the control information of the frequency representing relatively low.
In control module 14A, based on the control information representing the frequency of on-off element that voltage conversion unit 11 comprises, frequency error factor on-off element being carried out switch motion is the frequency corresponding with control information.Thereby, it is possible to according to the configuration information of user, the suitably frequency of configuration switch element, thus the efficiency of bias light driver module 1A is remained on high state.Such as, control module 14A is when control information is " 1 " representing relatively high frequency, being 1000KHz by the frequency error factor of on-off element, when control information is " 0 " representing relatively low frequency, is 500KHz by the frequency error factor of on-off element.In addition, in bias light driver module 1A, on-off element also can switch between the frequency being greater than two.If so, the bit number of control information also should correspondingly increase, so that the frequency that deterministic finite automata information is corresponding.
Particularly, in the control information generated by control module 2, represent the scope of electric current accordingly with each of multiple frequency.Such as, control information represents form as shown in table 1.
Table 1
| Current value | Frequency |
| 0～5mA | 500KHz |
| 5～10mA | 1MHz |
| 10～20mA | 1.2MHz |
The detecting unit (not shown in fig. 2) that configuration carrys out the electric current of detection background light source can also be comprised in bias light driver module 1A.In each control information situation representing the scope of electric current accordingly that receiving element 15 receives with multiple frequency, control module 14A obtains the first frequency corresponding with the scope that the electric current of the background light source detected by detecting unit falls into, and frequency error factor on-off element being carried out switch motion is this first frequency.Such as, when the current value of the background light source detected by detecting unit is 7mA, the frequency error factor that on-off element is carried out switch motion by control module 14A is 1MHz.Wherein, the number of the frequency of above table, the scope of current value are only examples, can according to the embody rule scene of bias light driver module 1A, dynamically and set neatly, to improve the efficiency of bias light driver module 1A.
Owing to be in the large state of electric current at background light source under, conduction loss is large, and the higher then efficiency of frequency of operation is higher.Otherwise under background light source is in the little state of electric current, switching loss is large, and the lower then efficiency of frequency of operation is higher.Therefore, in the form represented by control information, along with the rising of frequency, the current value in the scope of the electric current corresponding with it increases, thus the efficiency of bias light driver module 1A is remained on high state.
When representing the scope of electric current accordingly with each of multiple frequency in the control information generated by control module 2, control module 14A same as the prior artly, according to the current value detected by detecting unit 13, control bias light driver module carries out action parameter during action.But, in embodiments of the present invention, dynamically can set the scope with each corresponding electric current of multiple frequency, therefore, it is possible to according to concrete application scenarios, the switching point of the frequency of on-off element is set as optimal value.Relative to this, in the bias light driver module of prior art, only can carry out the frequency of change-over switch element based on the scope of the electric current corresponding with each frequency of the static settings when dispatching from the factory, the switching point that therefore there is institute's static settings is not suitable for the situation of concrete application scenarios.
As mentioned above, in bias light driver module 1A, control module 14A carrys out frequency when change-over switch element carries out switch motion according to the control information be received externally by receiving element 15, therefore, it is possible to according to the switching point of concrete the application scenarios dynamically and neatly frequency of configuration switch element, thus the efficiency of bias light driver module 1A is remained on high state.
Particularly, control module 2 generate control information represent the output mode of current output unit 12 time, control module 14A based on this control information, the output mode of switch current output unit 12.
Such as, in control module 2, generate control information based on user for the configuration information of background light source.Such as, control module 2 obtains the configuration information of the brightness for background light source, and generates suitable control information according to this configuration information.When the brightness of background light source is set to high, can thinks that the electric current of background light source is large, therefore in order to improve the efficiency of bias light driver module 1A, generating the control information representing Current Control output mode.Otherwise, when being set to low by the brightness of background light source, can thinking that the electric current of background light source is little, therefore in order to prevent the colour cast problem in Current Control output mode, generating the control information representing PWM output mode.
In control module 14A, based on the control information of the output mode of expression current output unit 12, the output mode of current output unit 12 is switched.Thereby, it is possible to according to the configuration information of user, suitably set the output mode of current output unit 12, thus the efficiency of bias light driver module 1A is remained on high state, and the colour cast problem under Current Control output mode can be prevented.Such as, control module 14A is when control information is the first information representing PWM output mode, the output mode of current output unit 12 is switched to PWM output mode, when control information is the second information representing Current Control output mode, the output mode of current output unit 12 is switched to Current Control output mode.
In addition, the detecting unit (not shown in fig. 2) that configuration carrys out the electric current of detection background light source can also be comprised in bias light driver module 1A.The control information generated by control module 2 also can for representing the 3rd information from main control of current output mode.When being received the control information of expression the 3rd information by receiving element 15, control module 14A also can compare current value and the threshold value of the background light source that detecting unit (not shown in Fig. 2) detects, when the current value detected is more than or equal to threshold value, the output mode of current output unit 12 is switched to Current Control output mode, when the current value detected is less than threshold value, the output mode of current output unit 12 is switched to PWM output mode.
As mentioned above, in bias light driver module 1A, control module 14A carrys out the output mode of switch current output unit 12 according to the control information be received externally by receiving element 15, therefore, it is possible to according to concrete application scenarios dynamically and set the switching point of output mode neatly, thus the efficiency of bias light driver module 1A is remained on high state, and overcome the colour cast problem under Current Control output mode.
In addition, in bias light driver module 1A, also can arrange register to store the control information received by receiving element 15, control module 14A carrys out control action parameter according to the control information stored in a register.
In the above description, be illustrated for the output mode of the frequency of control module 14A gauge tap element, current output unit 12, but the present invention is not limited to this, such as control module 14A is according to the frequency of control information gauge tap element of sending from control module 2 and the both sides of output mode, and control module 14A also can control other action parameter in addition.
Bias light driver module 1A according to the embodiment of the present invention and electronic equipment, can according to concrete application scenarios suitably control action parameter when bias light driver module 1A carries out action (dynamically and neatly the frequency of operation of alternation switch element switching point and PWM exports and the switching point of Current Control output), thus bias light driver module is remained on good state.
Those of ordinary skill in the art can recognize, are combined in unit and the module of embodiments of the present invention description, can realize with electronic hardware, computer software or the combination of the two.And software module can be placed in the computer-readable storage medium of arbitrary form.In order to the interchangeability of hardware and software is clearly described, generally describe composition and the step of each example in the above description according to function.These functions perform with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.Those skilled in the art can use distinct methods to realize described function to each specifically should being used for, but this realization should not thought and exceeds scope of the present invention.
Embodiments of the invention are described in detail above.But, it should be appreciated by those skilled in the art that without departing from the principles and spirit of the present invention, various amendment can be carried out to these embodiments, combination or sub-portfolio, and such amendment should fall within the scope of the present invention.
Claims (16)
1. a bias light driver module, comprising:
Receiving element, configuration carrys out receiving control information;
Control module, configuration comes based on described control information, controls action parameter when described bias light driver module carries out action.
2. bias light driver module as claimed in claim 1, comprising:
Voltage conversion unit, it comprises on-off element, and input voltage is converted to output voltage by configuration, and wherein said on-off element carries out switch motion with one of them frequency in multiple frequency,
Described control module, based on described control information, switches the frequency that described on-off element carries out switch motion.
3. bias light driver module as claimed in claim 2, wherein,
The frequency error factor that described on-off element is carried out switch motion by described control module is the frequency corresponding with described control information.
4. bias light driver module as claimed in claim 2, comprising:
Detecting unit, configuration carrys out the electric current of detection background light source,
Represent the scope of electric current accordingly with each of multiple frequency in described control information,
Described control module obtains the first frequency corresponding with the scope that the electric current of the background light source detected by described detecting unit falls into, and the frequency error factor described on-off element being carried out switch motion is described first frequency.
5. bias light driver module as claimed in claim 4, wherein,
In described control information, along with the rising of frequency, the value in the scope of the electric current corresponding with it increases.
6. bias light driver module as claimed in claim 1, comprising:
Current output unit, configuration drives background light source with the first output mode or the second output mode,
Described control module, based on described control information, switches the output mode of described current output unit.
7. bias light driver module as claimed in claim 6, wherein,
Described control module is when described control information is the first information, the output mode of described current output unit is switched to the first output mode, when described control information is the second information, the output mode of described current output unit is switched to the second output mode.
8. bias light driver module as claimed in claim 6, comprising:
Detecting unit, configuration carrys out the electric current of detection background light source,
When described control information is the 3rd information, described control module judges the electric current of the background light source detected by described detecting unit, when described electric current is more than or equal to threshold value, the output mode of described current output unit is switched to the second output mode, when described electric current is less than described threshold value, the output mode of described current output unit is switched to the first output mode.
9. an electronic equipment, comprising:
Bias light driver module, configuration drives background light source;
First control module, configuration generates control information, and sends to described bias light driver module,
Described bias light driver module comprises:
Receiving element, configuration receives described control information;
Second control module, configuration comes based on described control information, controls action parameter when described bias light driver module carries out action.
10. electronic equipment as claimed in claim 9, wherein,
Described bias light driver module comprises:
Voltage conversion unit, it comprises on-off element, and input voltage is converted to output voltage by configuration, and wherein said on-off element carries out switch motion with one of them frequency in multiple frequency,
Described second control module, based on described control information, switches the frequency that described on-off element carries out switch motion.
11. electronic equipments as claimed in claim 10, wherein,
Described first control module, based on the configuration information for described background light source, generates described control information,
The frequency error factor that described on-off element is carried out switch motion by described second control module is the frequency corresponding with described control information.
12. electronic equipments as claimed in claim 10, wherein,
Described first control module generates the control information representing the scope of electric current with each of multiple frequency accordingly,
Described bias light driver module also comprises:
Detecting unit, configuration carrys out the electric current of detection background light source,
Described second control module obtains the first frequency corresponding with the scope that the electric current of the background light source detected by described detecting unit falls into, and the frequency error factor described on-off element being carried out switch motion is described first frequency.
13. electronic equipments as claimed in claim 12, wherein,
In the described control information generated by described first control module, along with the rising of frequency, the value in the scope of the electric current corresponding with it increases.
14. electronic equipments as claimed in claim 9, wherein,
Described bias light driver module comprises:
Current output unit, configuration drives described background light source with the first output mode or the second output mode,
Described second control module, based on described control information, switches the output mode of described current output unit.
15. electronic equipments as claimed in claim 14, wherein,
Described first control module, based on the configuration information for described background light source, generates described control information,
Described second control module is when described control information is the first information, the output mode of described current output unit is switched to the first output mode, when described control information is the second information, the output mode of described current output unit is switched to the second output mode.
16. electronic equipments as claimed in claim 14, wherein,
Described bias light driver module also comprises:
Detecting unit, configuration carrys out the electric current of detection background light source,
When described control information is the 3rd information, described second control module judges the electric current of the background light source detected by described detecting unit, when described electric current is more than or equal to threshold value, the output mode of described current output unit is switched to the second output mode, when described electric current is less than described threshold value, the output mode of described current output unit is switched to the first output mode.
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| WO2022041074A1 (en) * | 2020-08-27 | 2022-03-03 | 南京英维尔科技服务有限公司 | Backlight apparatus control system for head-mounted device, and terminal |
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| CN101211538A (en) * | 2007-12-25 | 2008-07-02 | 康佳集团股份有限公司 | Backlight brightness regulating method |
| CN101583229A (en) * | 2008-05-15 | 2009-11-18 | 杭州茂力半导体技术有限公司 | Multi-discharge lamp parallel driving circuit and driving method |
| CN102594951A (en) * | 2011-01-05 | 2012-07-18 | 中兴通讯股份有限公司 | Drive control device for backlight of mobile phone display screen and method thereof |
| CN102523406A (en) * | 2011-12-07 | 2012-06-27 | 青岛海信电器股份有限公司 | Power circuit structure and LED liquid crystal television |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112331131A (en) * | 2019-07-30 | 2021-02-05 | 群创光电股份有限公司 | Display device |
| US11138934B2 (en) | 2019-07-30 | 2021-10-05 | Innolux Corporation | Display device |
| CN112331131B (en) * | 2019-07-30 | 2022-02-22 | 群创光电股份有限公司 | Display device |
| WO2022041074A1 (en) * | 2020-08-27 | 2022-03-03 | 南京英维尔科技服务有限公司 | Backlight apparatus control system for head-mounted device, and terminal |
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