CN105788538A - Display driving voltage gating circuit - Google Patents
Display driving voltage gating circuit Download PDFInfo
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- CN105788538A CN105788538A CN201610323879.2A CN201610323879A CN105788538A CN 105788538 A CN105788538 A CN 105788538A CN 201610323879 A CN201610323879 A CN 201610323879A CN 105788538 A CN105788538 A CN 105788538A
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- Prior art keywords
- voltage
- resistance
- display driving
- gating circuit
- driving voltage
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/04—Display protection
- G09G2330/045—Protection against panel overheating
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention belongs to the display technical field and discloses a display driving voltage division circuit. The display driving voltage division circuit includes a thermistor, a reference resistor, a voltage comparator and a voltage gating unit; the first end of the thermistor and the first end of the reference resistor are connected with a voltage input end; the second end of the thermistor and the second end of the reference resistor are connected with the first input end and the second input end of the voltage comparator respectively; the output end of the voltage comparator is connected with the voltage gating unit; and the voltage gating unit is used for outputting driving voltage when the voltage of the first input end is larger than the voltage of the second input end, and outputting voltage smaller than the driving voltage when the voltage of the first input end is smaller than the voltage of the second input end.
Description
Technical field
The present invention relates to Display Technique field, show driving voltage gating circuit particularly to one.
Background technology
Nowadays the processor of mobile phone is increasingly faster, causes that user is playing game, although when seeing video there being fluency, but mobile phone can more with more boiling hot.This boiling hot mainboard deriving from mobile phone, Mobile phone screen (IC temperature) and backlight temperature.If the power consumption that Mobile phone screen (IC temperature) consumes can be reduced, then the bulk temperature of mobile phone will necessarily be reduced.
Summary of the invention
(1) to solve the technical problem that
The technical problem to be solved in the present invention is: how to reduce the temperature of mobile phone display screen IC.
(2) technical scheme
For solving above-mentioned technical problem, the invention provides a kind of display driving voltage gating circuit, including: critesistor, reference resistance, voltage comparator and voltage gating unit；Described critesistor and respective first end of reference resistance connect voltage input end, respective second end connects positive input terminal and the negative input end of voltage comparator respectively, the outfan of described voltage comparator connects described voltage gating unit, described voltage gating unit for the voltage of positive input terminal more than the voltage of negative input end time outputting drive voltage, when the voltage of positive input terminal is less than or equal to the voltage of negative input end, output is less than the voltage of described driving voltage.
Wherein, described voltage gating unit includes: the first PMOS, the second PMOS, the first NMOS tube, the second NMOS tube, the 3rd NMOS tube, the 4th NMOS tube, the first resistance and the second resistance, the grid of each metal-oxide-semiconductor is all connected with the outfan of described voltage comparator；
Described first PMOS and the respective source electrode of the first NMOS tube are all connected with high voltage end, respective drain electrode is joined together to form the first voltage output end, the source electrode of described second NMOS tube connects described first voltage output end by described first resistance, and drain electrode connects low-voltage end；
Described second PMOS and the 3rd respective source electrode of NMOS tube are all connected with low-voltage end, respective drain electrode is joined together to form the second voltage output end, the drain electrode of described 4th NMOS tube connects described second voltage output end by described second resistance, and source electrode connects high voltage end.
Wherein, the resistance of described reference resistance be critesistor more than 50 DEG C of temperature time the critical resistance of resistance.
Wherein, the resistance of described first resistance and the second resistance is equal, and resistance is 400 Ω～450 Ω.
Wherein, described critesistor and respective second end of reference resistance are respectively through the 3rd resistance and the 4th resistance eutral grounding.
Wherein, described critesistor and respective second end of reference resistance connect positive input terminal and the negative input end of voltage comparator respectively through the 5th resistance and the 6th resistance.
Wherein, the positive input terminal of described voltage comparator passes through the 7th resistance eutral grounding.
Wherein, the negative input end of described voltage comparator connects outfan by the 8th resistance.
Present invention also offers a kind of display device, including the described display driving voltage gating circuit of any of the above-described item.
Present invention also offers the voltage gating method of a kind of display driving voltage gating circuit utilized described in any of the above-described item, including step:
Voltage comparator Real-time Collection temperature-sensitive voltage after critesistor and reference resistance and reference voltage；
Reference voltage is deducted the pressure reduction of temperature-sensitive voltage and inputs to voltage gating unit by voltage comparator；
The outputting drive voltage when described pressure reduction is negative value, described pressure reduction be on the occasion of time output less than the voltage of described driving voltage.
(3) beneficial effect
Mobile phone temp is carried out real-time collection by a critesistor by the present invention, and by comparing with reference resistance value, sees if fall out default specification.Passing behind voltage gating circuit and carry out voltage selection, if beyond temperature preset value, then supply voltage is carried out voltage division processing, reduce supply voltage, thus reducing power consumption, reducing the requirement of temperature.Otherwise, then export according to normal supply voltage.
Accompanying drawing explanation
Fig. 1 is the one display driving voltage gating circuit structural representation of the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following example are used for illustrating the present invention, but are not limited to the scope of the present invention.
The display driving voltage gating circuit of the present embodiment is as it is shown in figure 1, include: critesistor R, reference resistance Ref, voltage comparator C and voltage gating unit.Respective first end of critesistor R and reference resistance Ref connects voltage input end VDD, and respective second end connects positive input terminal and the negative input end of voltage comparator C respectively, and the outfan of voltage comparator C connects voltage gating unit.Voltage gating unit is for the outputting drive voltage when the voltage of positive input terminal is more than the voltage of negative input end, when the voltage of positive input terminal is less than or equal to the voltage of negative input end, less than the voltage of described driving voltage, (display of general mobile phone drives IC to have a minimum voltage less than driving voltage in output, as long as the input voltage of reality is more than this minimum voltage, also can realize display).
Critesistor is the resistance that a kind of resistance value increases with temperature rising, and in the present embodiment, the resistance selecting reference resistance Ref is the critesistor R resistance in temperature threshold (such as 50 DEG C, think that more than 50 DEG C caloric value the is high) correspondence set.When mobile phone temp is relatively low, the resistance that the actual resistance of critesistor R is corresponding less than this temperature threshold, the voltage of the positive input terminal of voltage comparator C can more than the voltage of negative input end, and now voltage gating unit selects outputting drive voltage, i.e. driven.When mobile phone temp raises, when exceeding this temperature threshold, the actual resistance making critesistor R meets and exceeds the resistance that this temperature threshold is corresponding, the voltage of the positive input terminal of voltage comparator C can less than or equal to the voltage of negative input end, now voltage gating unit selects the output voltage less than driving voltage, to reduce caloric value, reduce power consumption.
Specifically, in Fig. 1 shown in broken box, voltage gating unit includes: the first PMOS P1, the second PMOS P2, the first NMOS tube N1, the second NMOS tube N2, the 3rd NMOS tube N3, the 4th NMOS tube N4, the first resistance R1 and the second resistance R2.Wherein, the grid of each metal-oxide-semiconductor is all connected with the outfan of voltage comparator C, first PMOS P1 and the respective source electrode of the first NMOS tube N1 are all connected with high voltage end AVDD, respective drain electrode is joined together to form the first voltage output end out1, the source electrode of described second NMOS tube N2 connects described first voltage output end out1 by described first resistance R1, and drain electrode connects low-voltage end AVEE.Second PMOS P2 and the three respective source electrode of NMOS tube N3 is all connected with low-voltage end AVEE, respective drain electrode is joined together to form the second voltage output end out2, the drain electrode of the 4th NMOS tube N4 connects the second voltage output end out2 by the second resistance R2, and source electrode connects high voltage end AVDD.
Set it is believed that Rc is as the resistance under temperature threshold of critesistor.Now select Ref=Rc；Additionally for convenience of circuit design, it is possible to make R3=R4, R5=R6=R7=R8, R1=R2；
The Ref when temperature is normal>R, i.e. Va<Vb, then Vc<0；Now N1, N2, N3 and N4 pipe cut-off, P1 and P2 pipe is opened, and Vout1 exports AVDD voltage, and Vout2 exports AVEE voltage, and both pressure reduction is normal driving voltage.
Ref<R, i.e. Va when temperature is improper>Vb, then Vc>0；Now N1, N2, N3 and N4 pipe is opened, P1 and P2 pipe ends, the then internal resistance of N1 pipe, R1 and N2 pipe internal resistance carry out parallel connection, select the resistance of a suitable R1=R2, carry out dividing potential drop, Vout1 and the Vout2 making output can meet the normal use of Mobile phone screen, can reduce again input voltage.
In the present embodiment, the resistance of reference resistance Ref be critesistor R more than 50 DEG C of temperature time resistance, when namely mobile phone temp reaches 50 DEG C and certain temperature value above, it is believed that caloric value is high, and actual temp value can set with practical situation.
In the present embodiment, through repeatedly testing, it is preferable that the resistance of R1 and R2 is 400 Ω～450 Ω, now the output voltage after R1 and R2 dividing potential drop can meet the minimum voltage of Mobile phone screen driving IC.
Respective second end of critesistor R and reference resistance Ref is respectively through the 3rd resistance R3 and the four resistance R4 ground connection, to prevent big electric current from burning out circuit.
In the present embodiment, respective second end of described critesistor R and reference resistance Ref connects positive input terminal and the negative input end of voltage comparator C respectively through the 5th resistance R5 and the six resistance R6.5th resistance R5 and the six resistance R6 is used for impedance matching, is used for preventing voltage excessive, causes burning out voltage comparator C, play cushioning and protection.
In the present embodiment, the positive input terminal of voltage comparator C passes through the 7th resistance R7 ground connection, to prevent big electric current from burning out comparator.
In the present embodiment, the negative input end of voltage comparator C connects outfan by the 8th resistance R8, and the 8th resistance R8 is feedback resistance.
Present invention also offers the voltage gating method of a kind of display driving voltage gating circuit utilized described in any of the above-described item, including step:
Voltage comparator Real-time Collection temperature-sensitive voltage after critesistor and reference resistance and reference voltage.
Reference voltage is deducted the pressure reduction of temperature-sensitive voltage and inputs to voltage gating unit by voltage comparator.
The outputting drive voltage when described pressure reduction is negative value, described pressure reduction be on the occasion of time output less than the voltage of described driving voltage.
Present invention also offers a kind of display device, the backlight module of described display device includes the illuminator described in any of the above-described item.This display device can be: any product with display function or the parts such as liquid crystal panel, oled panel, mobile phone, panel computer, television set, display, notebook computer, DPF, navigator.
Embodiment of above is merely to illustrate the present invention; and it is not limitation of the present invention; those of ordinary skill about technical field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all equivalent technical schemes fall within scope of the invention, and the scope of patent protection of the present invention should be defined by the claims.
Claims (10)
1. a display driving voltage gating circuit, it is characterised in that including: critesistor, reference resistance, voltage comparator and voltage gating unit；Described critesistor and respective first end of reference resistance connect voltage input end, respective second end connects positive input terminal and the negative input end of voltage comparator respectively, the outfan of described voltage comparator connects described voltage gating unit, described voltage gating unit for the voltage of positive input terminal more than the voltage of negative input end time outputting drive voltage, when the voltage of positive input terminal is less than or equal to the voltage of negative input end, output is less than the voltage of described driving voltage.
2. display driving voltage gating circuit as claimed in claim 1, it is characterized in that, described voltage gating unit includes: the first PMOS, the second PMOS, the first NMOS tube, the second NMOS tube, the 3rd NMOS tube, the 4th NMOS tube, the first resistance and the second resistance, the grid of each metal-oxide-semiconductor is all connected with the outfan of described voltage comparator；
Described first PMOS and the respective source electrode of the first NMOS tube are all connected with high voltage end, respective drain electrode is joined together to form the first voltage output end, the source electrode of described second NMOS tube connects described first voltage output end by described first resistance, and drain electrode connects low-voltage end；
Described second PMOS and the 3rd respective source electrode of NMOS tube are all connected with low-voltage end, respective drain electrode is joined together to form the second voltage output end, the drain electrode of described 4th NMOS tube connects described second voltage output end by described second resistance, and source electrode connects high voltage end.
3. display driving voltage gating circuit as claimed in claim 1 or 2, it is characterised in that the resistance of described reference resistance be critesistor more than 50 DEG C of temperature time resistance.
4. display driving voltage gating circuit as claimed in claim 1 or 2, it is characterised in that the resistance of described first resistance and the second resistance is equal, and resistance is 400 Ω～450 Ω.
5. display driving voltage gating circuit as claimed in claim 1 or 2, it is characterised in that described critesistor and respective second end of reference resistance are respectively through the 3rd resistance and the 4th resistance eutral grounding.
6. display driving voltage gating circuit as claimed in claim 1 or 2, it is characterised in that described critesistor and respective second end of reference resistance connect positive input terminal and the negative input end of voltage comparator respectively through the 5th resistance and the 6th resistance.
7. display driving voltage gating circuit as claimed in claim 1 or 2, it is characterised in that the positive input terminal of described voltage comparator passes through the 7th resistance eutral grounding.
8. display driving voltage gating circuit as claimed in claim 1 or 2, it is characterised in that the negative input end of described voltage comparator connects outfan by the 8th resistance.
9. a display device, it is characterised in that include showing driving voltage gating circuit as according to any one of claim 1～8.
10. the voltage gating method of the display driving voltage gating circuit that a kind utilizes according to any one of claim 1～8, it is characterised in that include step:
Voltage comparator Real-time Collection temperature-sensitive voltage after critesistor and reference resistance and reference voltage；
Reference voltage is deducted the pressure reduction of temperature-sensitive voltage and inputs to voltage gating unit by voltage comparator；
The outputting drive voltage when described pressure reduction is negative value, described pressure reduction be on the occasion of time output less than the voltage of described driving voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610323879.2A CN105788538B (en) | 2016-05-16 | 2016-05-16 | Show driving voltage gating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610323879.2A CN105788538B (en) | 2016-05-16 | 2016-05-16 | Show driving voltage gating circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105788538A true CN105788538A (en) | 2016-07-20 |
| CN105788538B CN105788538B (en) | 2018-03-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610323879.2A Active CN105788538B (en) | 2016-05-16 | 2016-05-16 | Show driving voltage gating circuit |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101135917A (en) * | 2006-08-28 | 2008-03-05 | 联詠科技股份有限公司 | Voltage regulator |
| CN101174391A (en) * | 2006-11-01 | 2008-05-07 | 联詠科技股份有限公司 | Voltage conversion device with non-linear gain |
| EP2387024A1 (en) * | 2010-05-12 | 2011-11-16 | Samsung Electronics Co., Ltd. | Display apparatus |
| CN203422692U (en) * | 2013-07-22 | 2014-02-05 | 安凯(广州)微电子技术有限公司 | Low dropout regulator and soft start circuit of low dropout regulator |
| CN104617551A (en) * | 2015-01-13 | 2015-05-13 | 生迪光电科技股份有限公司 | Low-temperature protection circuit and electronic device |
-
2016
- 2016-05-16 CN CN201610323879.2A patent/CN105788538B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101135917A (en) * | 2006-08-28 | 2008-03-05 | 联詠科技股份有限公司 | Voltage regulator |
| CN101174391A (en) * | 2006-11-01 | 2008-05-07 | 联詠科技股份有限公司 | Voltage conversion device with non-linear gain |
| EP2387024A1 (en) * | 2010-05-12 | 2011-11-16 | Samsung Electronics Co., Ltd. | Display apparatus |
| CN203422692U (en) * | 2013-07-22 | 2014-02-05 | 安凯(广州)微电子技术有限公司 | Low dropout regulator and soft start circuit of low dropout regulator |
| CN104617551A (en) * | 2015-01-13 | 2015-05-13 | 生迪光电科技股份有限公司 | Low-temperature protection circuit and electronic device |
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| Publication number | Publication date |
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| CN105788538B (en) | 2018-03-09 |
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