CN104185344A - Light source control circuit, backlight module and display device - Google Patents
Light source control circuit, backlight module and display device Download PDFInfo
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- CN104185344A CN104185344A CN201410400829.0A CN201410400829A CN104185344A CN 104185344 A CN104185344 A CN 104185344A CN 201410400829 A CN201410400829 A CN 201410400829A CN 104185344 A CN104185344 A CN 104185344A
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Abstract
The invention discloses a light source control circuit, a backlight module and a display device, and relates to the technical field of display. The temperature of a light source can be prevented from being too high, reliability of the backlight module is improved, and the fault rate of the backlight module is reduced. The light source control circuit comprises a booster circuit, a temperature sensing element and a control unit, the booster circuit comprises a chip and a sampling unit, the output end of the chip is connected with the sampling unit, the sampling unit is connected with a feedback end of the chip, and the sampling unit is used for sampling output voltage of the chip and outputting the sampled voltage to the feedback end of the chip. The control unit is used for controlling the sampled voltage output by the sampling unit to be increased when the temperature sensing element senses that the temperature is larger than a preset value, and the control unit is further used for controlling the sampled voltage output by the sampling unit to be reduced when the temperature sensing element senses that the temperature is smaller than the preset value.
Description
Technical field
The present invention relates to Display Technique field, relate in particular to a kind of control circuit for light source, backlight module and display unit.
Background technology
In display unit, conventionally provide backlight by backlight module, light source in backlight module is subject to the impact such as the factor such as impedance fluctuations, ambient temperature, likely can cause light-source temperature too high, thereby causes the reduction of backlight module reliability and the increase of failure rate.Existing light source by Boost booster circuit drive realize luminous, Boost booster circuit is conventionally by feedback regulation output voltage, so that output voltage tends towards stability, because the output voltage of Boost booster circuit has determined the brightness of light source, therefore avoid to a certain extent therefore light-source brightness to increase the excess Temperature problem causing.But being limited in scope of Boost booster circuit feedback regulation, therefore, still lacks at present effective means and prevents that light-source temperature is too high.
Summary of the invention
The invention provides a kind of control circuit for light source, backlight module and display unit, can avoid light-source temperature too high, not only promoted the reliability of backlight module, also reduced the failure rate of backlight module simultaneously.
For achieving the above object, the present invention adopts following technical scheme:
First aspect, provides a kind of control circuit for light source, comprising:
Booster circuit, described booster circuit comprises chip and sampling unit, the output of described chip is connected in described sampling unit, described sampling unit is connected in the feedback end of described chip, and described sampling unit is for sampling to the output voltage of described chip and exporting the feedback end of sampled voltage to described chip.
Temperature sensitive member.
Be connected in the control unit of described temperature sensitive member and described sampling unit, when described control unit is greater than preset value for the temperature sensing when described temperature sensitive member, the sampled voltage of controlling described sampling unit output increases, when described control unit is also less than preset value for the temperature sensing when described temperature sensitive member, the sampled voltage of controlling described sampling unit output reduces.
Alternatively, described sampling unit comprises the first division module and the second division module, the first end of described the first division module is connected in the output of described chip, the second end of described the first division module is connected in the feedback end of described chip, the first end of described the second division module is connected in the feedback end of described chip, the second end ground connection of described the second division module.
Alternatively, described control unit is connected in described the second division module, when described control unit is greater than preset value for the temperature sensing when described temperature sensitive member, the impedance of controlling described the second division module increases, when described control unit is less than preset value for the temperature sensing when temperature sensitive member, the impedance of controlling described the second division module reduces.
Particularly, described the first division module comprises the first resistance, and the first end of described the first resistance is connected in the output of described chip, and the second end of described the first resistance is connected in the feedback end of described chip.
Alternatively, described the second division module comprises the second resistance, the 3rd resistance and switching tube, the first end of described the second resistance is connected in the feedback end of described chip, the second end ground connection of described the second resistance, the first end of described the 3rd resistance is connected in the feedback end of described chip, the first end of described switching tube is connected in the second end of described the 3rd resistance, the second end ground connection of described switching tube.
Particularly, described control unit is connected in the control end of described switching tube, described control unit is the control end to described switching tube for output pulse signal, when the temperature sensing when described temperature sensitive member is greater than preset value, described in described control unit control, the duty ratio of pulse signal reduces, when the temperature sensing when temperature sensitive member is less than preset value, the duty ratio of pulse signal increases described in described control unit control control.
Particularly, described the second division module also comprises electric capacity, and the first end of described electric capacity is connected in the feedback end of described chip, the second end ground connection of described electric capacity.
Particularly, described control unit is single-chip microcomputer, described temperature sensitive member is thermistor, described switching tube is MOS (Metal-Oxide-Semiconductor, metal-oxide semiconductor (MOS)) pipe, the first end of described switching tube is the drain electrode of described metal-oxide-semiconductor, the source electrode that the second end of described switching tube is described metal-oxide-semiconductor, the grid that the control end of described switching tube is described switching tube.
Second aspect, also provides a kind of backlight module, comprises light source, also comprises above-mentioned control circuit for light source, and in described control circuit for light source, the chip output of booster circuit is connected in described light source.
The third aspect, also provides a kind of display device, comprises described backlight module.
Control circuit for light source provided by the invention, backlight module and display device, first respond in real time the temperature of light source by the temperature sensitive member in circuit and compare with default standard temperature, if light-source temperature is higher than default standard value, increase sampling unit and output to again the sampled voltage of chip feedback end by the control unit in circuit, thereby reduce the output voltage of chip output, avoid the too high phenomenon of light-source temperature to occur, not only promote the reliability of backlight module, and reduced the failure rate of backlight module.
Brief description of the drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, to the accompanying drawing of required use in embodiment be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The schematic diagram of a kind of control circuit for light source that Fig. 1 provides for the embodiment of the present invention;
The schematic diagram of the another kind of control circuit for light source that Fig. 2 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, the embodiment of the present invention provides a kind of control circuit for light source, comprising: booster circuit 1, temperature sensitive member 2 and be connected in temperature sensitive member 2 and control unit 3.
Booster circuit 1 comprises chip 11 and sampling unit 12, the output end vo ut of chip 11 is connected in sampling unit 12, sampling unit 12 is connected in the feedback end FB of chip 11, and sampling unit 12 is for sampling to the output voltage of chip 11 and exporting the feedback end FB of sampled voltage to chip 11.
When control unit 3 is greater than preset value for the temperature sensing when temperature sensitive member 2, control the sampled voltage increase that sampling unit 12 is exported, when control unit 3 is also less than preset value for the temperature sensing when temperature sensitive member 2, the sampled voltage that control sampling unit 12 is exported reduces.
Particularly, above-mentioned control circuit for light source is for controlling the light source of backlight module, and booster circuit 1 is for driving light source, and the output of chip 11 is connected in light source (not shown), and the output voltage of chip 11 is the driving voltage of light source.Chip 11 is by sampled voltage and reference voltage are compared, and regulates the output voltage of chip 11 according to comparative result.Temperature in temperature sensitive member 2 inductive backlight modules, in the time that this temperature is greater than preset value, illustrate that the temperature of backlight module is higher than ideal temperature, now control the sampled voltage increase that sampling unit 12 is exported, sampled voltage is compared with reference voltage greatly, and therefore chip 11 regulates output voltage is reduced, and reduces temperature by the driving voltage that reduces light source, prevent backlight module excess Temperature with this, can reduce the brightness of light source simultaneously; When the temperature sensing when temperature sensitive member 2 is less than preset value, the temperature that backlight module is described is lower, now controlling the sampled voltage that sampling unit 12 exports reduces, sampled voltage is compared little with reference voltage, therefore chip 11 regulates output voltage is increased, and increases the driving voltage of light source so that light-source brightness recovers normal.
Control circuit for light source in the present embodiment, first respond in real time the temperature of light source by the temperature sensitive member in circuit and compare with default standard temperature, if light-source temperature is higher than default standard value, increase sampling unit and output to again the sampled voltage of chip feedback end by the control unit in circuit, thereby reduce the output voltage of chip output, avoid the too high phenomenon of light-source temperature to occur, not only promote the reliability of backlight module, and reduced the failure rate of backlight module.
As shown in Figure 2, concrete, above-mentioned sampling unit can comprise the first division module 121 and the second division module 122, the first end of the first division module 121 is connected in the output end vo ut of chip 11, the second end of the first division module 121 is connected in the feedback end FB of chip 11, the first end of the second division module 122 is connected in the feedback end FB of chip 11, the second end ground connection of the second division module 122; Control unit 3 is connected in the second division module 122, when control unit 3 is greater than preset value for the temperature sensing when temperature sensitive member 2, the impedance of controlling the second division module 122 increases, when control unit 3 is less than preset value for the temperature sensing when temperature sensitive member 2, the impedance of controlling the second division module 122 reduces.
The first division module 121 and the second division module 122 are for carrying out dividing potential drop to the output voltage of chip 11, the voltage at feedback end FB place is the sampled voltage after dividing potential drop, sampled voltage is obtained by the impedance proportionate relationship of the first division module 121 and the second division module 122, chip 11 is by sampled voltage and reference voltage are compared, and regulates the output voltage of chip 11 according to comparative result.In the time that the impedance of the second division module 122 increases, the impedance of the first division module 121 is constant, therefore makes sampled voltage increase, and sampled voltage is compared with reference voltage greatly, and therefore chip 11 can regulate output voltage is reduced; In the time that the impedance of the second division module 122 reduces, the impedance of the first division module 121 is constant, therefore makes sampled voltage reduce, and sampled voltage is compared little with reference voltage, and therefore chip 11 can regulate output voltage is increased.
Alternatively, the first division module 121 can comprise that the first end of the first resistance R 1, the first resistance R 1 is connected in the output end vo ut of chip 11, and the second end of the first resistance R 1 is connected in the feedback end of chip 11; The second division module 122 can comprise the second resistance R 2, the 3rd resistance R 3 and switching tube M1, the first end of the second resistance R 2 is connected in the feedback end FB of chip 11, the second end ground connection of the second resistance R 2, the first end of the 3rd resistance R 3 is connected in the feedback end FB of chip 11, the first end of switching tube M1 is connected in the second end of the 3rd resistance R 3, the second end ground connection of switching tube M1; Control unit 3 is connected in the control end of switching tube M1, control unit 3 is the control end to switching tube M1 for output pulse signal, when the temperature sensing when temperature sensitive member 2 is greater than preset value, the duty ratio of control unit 3 control waves reduces, when the temperature sensing when temperature sensitive member 2 is less than preset value, the duty ratio that control unit 3 is controlled control wave increases.
Wherein, described duty ratio is the amplification explanation to automatically controlled pulse-width modulation, and duty ratio refers to that in fact the time that in check circuit is switched on accounts for the percentage in whole circuit working cycle.In the present embodiment, duty ratio refers to that the duration of conduction level in pulse signal is at one-period proportion, and conduction level refers to the level of energy control switch pipe M1 conducting.When switching tube M1 cut-off, the impedance of the second division module 122 is the impedance of the second resistance R 2, when switching tube M1 conducting, the impedance of the second division module 122 is the impedance of the second resistance R 2 and the 3rd resistance R 3 parallel connections, i.e. the impedance of the second division module 122 when the impedance of the second division module 122 is greater than switching tube M2 conducting when switching tube M1 cut-off.Switching tube M1 changes according to being controlled between conducting and cut-off state of pulse signal, and in the time that the duty ratio of pulse signal reduces, the impedance of the second division module 122 increases, and in the time that the duty ratio of pulse signal increases, the impedance of the second division module 122 reduces.
Alternatively, the second division module 122 can also comprise capacitor C 1, and the first end of capacitor C 1 is connected in the feedback end FB of chip 11, the second end ground connection of capacitor C 1.Wherein, the effect of described electric capacity is for the sampled voltage in stabilizing circuit.
Particularly, described control unit 3 can be single-chip microcomputer, can be also other device or the equipment that can realize described control unit 3 functions.
Particularly, described temperature sensitive member 2 can be thermistor.
Particularly, described switching tube M1 can be metal-oxide-semiconductor, and the first end of described switching tube M1 is the drain electrode of metal-oxide-semiconductor, and the second end of described switching tube M1 is the source electrode of metal-oxide-semiconductor, and the control end of described switching tube M1 is the grid of described switching tube M1.Switching tube M1 can be also other switching devices such as IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor).
By a concrete light source control method, above-mentioned control circuit for light source is described below.
Particularly, temperature in temperature sensitive member 2 inductive backlight modules, in the time that this temperature is greater than preset value, illustrate that the temperature of backlight module is higher than ideal temperature, now the duty ratio of control unit 3 control waves reduces, even if the impedance of the second division module 122 increases, thereby sampled voltage is increased, sampled voltage is compared with reference voltage greatly, therefore chip 11 regulates output voltage is reduced, reduce temperature by the driving voltage that reduces light source, prevent backlight module excess Temperature with this, can reduce the brightness of light source simultaneously; When the temperature sensing when temperature sensitive member 2 is less than preset value, the temperature that backlight module is described is lower, the duty ratio of those 3 control waves far away such as now control increases, even if the impedance of the second division module 122 reduces, thereby sampled voltage is reduced, sampled voltage is compared little with reference voltage, therefore chip 11 regulates output voltage is increased, and increases the driving voltage of light source so that light-source brightness recovers normal.
Control circuit for light source in the present embodiment, first respond in real time the temperature of light source by the temperature sensitive member in circuit and compare with default standard temperature, if light-source temperature is higher than default standard value, increase sampling unit and output to again the sampled voltage of chip feedback end by the control unit in circuit, thereby reduce the output voltage of chip output, avoid the too high phenomenon of light-source temperature to occur, not only promote the reliability of backlight module, and reduced the failure rate of backlight module.
The present invention also provides a kind of backlight module, comprises light source, also comprises above-mentioned control circuit for light source, and in control circuit for light source, the chip output of booster circuit is connected in this light source.This light source is preferably LED (Light Emitting Diode, light-emitting diode).
Wherein the concrete structure of control circuit for light source and principle are same as the previously described embodiments, do not repeat them here.
The present invention also provides a kind of display unit, comprises above-mentioned backlight module.
This display unit can be: any product or parts that provided backlight and had Presentation Function by backlight module such as display panels, mobile phone, panel computer, television set, display, notebook computer, DPF, navigator.
Above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, any be familiar with those skilled in the art the present invention disclose technical scope in; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (9)
1. a control circuit for light source, is characterized in that, comprising:
Booster circuit, described booster circuit comprises chip and sampling unit, the output of described chip is connected in described sampling unit, described sampling unit is connected in the feedback end of described chip, and described sampling unit is for sampling to the output voltage of described chip and exporting the feedback end of sampled voltage to described chip;
Temperature sensitive member;
Be connected in the control unit of described temperature sensitive member and described sampling unit, when described control unit is greater than preset value for the temperature sensing when described temperature sensitive member, the sampled voltage of controlling described sampling unit output increases, when described control unit is also less than preset value for the temperature sensing when described temperature sensitive member, the sampled voltage of controlling described sampling unit output reduces.
2. control circuit for light source according to claim 1, is characterized in that,
Described sampling unit comprises the first division module and the second division module, the first end of described the first division module is connected in the output of described chip, the second end of described the first division module is connected in the feedback end of described chip, the first end of described the second division module is connected in the feedback end of described chip, the second end ground connection of described the second division module;
Described control unit is connected in described the second division module, when described control unit is greater than preset value for the temperature sensing when described temperature sensitive member, the impedance of controlling described the second division module increases, when described control unit is less than preset value for the temperature sensing when temperature sensitive member, the impedance of controlling described the second division module reduces.
3. control circuit for light source according to claim 2, is characterized in that,
Described the first division module comprises the first resistance, and the first end of described the first resistance is connected in the output of described chip, and the second end of described the first resistance is connected in the feedback end of described chip;
Described the second division module comprises the second resistance, the 3rd resistance and switching tube, the first end of described the second resistance is connected in the feedback end of described chip, the second end ground connection of described the second resistance, the first end of described the 3rd resistance is connected in the feedback end of described chip, the first end of described switching tube is connected in the second end of described the 3rd resistance, the second end ground connection of described switching tube;
Described control unit is connected in the control end of described switching tube, described control unit is the control end to described switching tube for output pulse signal, when the temperature sensing when described temperature sensitive member is greater than preset value, described in described control unit control, the duty ratio of pulse signal reduces, when the temperature sensing when temperature sensitive member is less than preset value, the duty ratio of pulse signal increases described in described control unit control control.
4. control circuit for light source according to claim 3, is characterized in that,
Described the second division module also comprises electric capacity, and the first end of described electric capacity is connected in the feedback end of described chip, the second end ground connection of described electric capacity.
5. according to the control circuit for light source described in any one in claim 1 to 4, it is characterized in that,
Described control unit is single-chip microcomputer.
6. according to the control circuit for light source described in any one in claim 1 to 4, it is characterized in that,
Described temperature sensitive member is thermistor.
7. according to the control circuit for light source described in claim 3 or 4, it is characterized in that,
Described switching tube is metal-oxide-semiconductor, the drain electrode that the first end of described switching tube is described metal-oxide-semiconductor, the source electrode that the second end of described switching tube is described metal-oxide-semiconductor, the grid that the control end of described switching tube is described switching tube.
8. a backlight module, comprises light source, it is characterized in that, also comprises control circuit for light source as claimed in any of claims 1 to 7 in one of claims, and in described control circuit for light source, the chip output of booster circuit is connected in described light source.
9. a display unit, is characterized in that, comprises backlight module as claimed in claim 8.
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| CN201410400829.0A CN104185344B (en) | 2014-08-14 | 2014-08-14 | Control circuit for light source, backlight module and display device |
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| CN201410400829.0A CN104185344B (en) | 2014-08-14 | 2014-08-14 | Control circuit for light source, backlight module and display device |
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| CN104185344B CN104185344B (en) | 2016-11-16 |
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| CN106354075A (en) * | 2016-11-25 | 2017-01-25 | 北京意同创科技有限公司 | Control circuit of remote controller with backlight screen |
| CN107196546A (en) * | 2017-06-09 | 2017-09-22 | 苏州汇川联合动力系统有限公司 | A kind of active discharge system of electric machine controller |
| CN107256697A (en) * | 2017-07-31 | 2017-10-17 | 昆山龙腾光电有限公司 | Backlight drive circuit |
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| CN104185344B (en) | 2016-11-16 |
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