CN105788538B - Show driving voltage gating circuit - Google Patents
Show driving voltage gating circuit Download PDFInfo
- Publication number
- CN105788538B CN105788538B CN201610323879.2A CN201610323879A CN105788538B CN 105788538 B CN105788538 B CN 105788538B CN 201610323879 A CN201610323879 A CN 201610323879A CN 105788538 B CN105788538 B CN 105788538B
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- voltage
- resistance
- comparator
- connects
- thermistor
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Classifications
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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 present invention relates to display technology field, discloses a kind of display driving bleeder circuit, including：Thermistor, reference resistance, voltage comparator and voltage gating unit；The thermistor connects voltage input end with the respective first end of reference resistance, respective second end connects the first input end and the second input of voltage comparator respectively, the output end of the voltage comparator connects the voltage gating unit, the outputting drive voltage when voltage that the voltage gating unit is used for first input end is more than the voltage of the second input, the voltage of first input end are less than or equal to export the voltage less than the driving voltage during voltage of the second input.
Description
Technical field
It is more particularly to a kind of to show driving voltage gating circuit the present invention relates to display technology field.
Background technology
Nowadays the processor of mobile phone is more and more faster, causes user playing game, although seeing there there is fluency during video,
It is that mobile phone can be more with boiling hotter.This mainboard scalded from mobile phone, Mobile phone screen (IC temperature) and backlight temperature.If hand can be reduced
The power consumption that machine screen (IC temperature) is consumed, then the bulk temperature of mobile phone will necessarily be reduced.
The content of the invention
(1) technical problems to be solved
The technical problem to be solved in the present invention is：How mobile phone display screen IC temperature is reduced.
(2) technical scheme
In order to solve the above technical problems, the invention provides one kind to show driving voltage gating circuit, including：Temperature-sensitive electricity
Resistance, reference resistance, voltage comparator and voltage gating unit；The thermistor connects electricity with the respective first end of reference resistance
Input is pressed, respective second end connects the positive input terminal and negative input end of voltage comparator respectively, the voltage comparator
Output end connects the voltage gating unit, and the voltage gating unit is used for electricity of the voltage more than negative input end of positive input terminal
Outputting drive voltage during pressure, the voltage of positive input terminal are less than or equal to export less than the driving voltage during voltage of negative input end
Voltage.
Wherein, the voltage gating unit includes：First PMOS, the second PMOS, the first NMOS tube, the 2nd NMOS
Pipe, the 3rd NMOS tube, the 4th NMOS tube, first resistor and second resistance, the grid of each metal-oxide-semiconductor are all connected with the voltage comparator
Output end；
The respective source electrode of first PMOS and the first NMOS tube is all connected with high voltage end, and respective drain electrode is connected to one
Rise and form first voltage output end, the source electrode of second NMOS tube connects the first voltage by the first resistor and exported
End, drain electrode connection low-voltage end；
Second PMOS and the 3rd respective source electrode of NMOS tube are all connected with low-voltage end, and respective drain electrode is connected to one
Rise and form second voltage output end, the drain electrode of the 4th NMOS tube connects the second voltage by the second resistance and exported
End, source electrode connection high voltage end.
Wherein, the resistance of the reference resistance be thermistor more than 50 DEG C of temperature when resistance critical resistance.
Wherein, the resistance of the first resistor and second resistance is equal, and resistance is the Ω of 400 Ω~450.
Wherein, respective second end of the thermistor and reference resistance is connect by 3rd resistor and the 4th resistance respectively
Ground.
Wherein, the thermistor is connected by the 5th resistance and the 6th resistance respectively with respective second end of reference resistance
The positive input terminal and negative input end of voltage comparator.
Wherein, the positive input terminal of the voltage comparator passes through the 7th resistance eutral grounding.
Wherein, the negative input end of the voltage comparator connects output end by the 8th resistance.
Driving voltage gating circuit is shown present invention also offers a kind of display device, including described in any of the above-described.
Present invention also offers a kind of voltage gating of the display driving voltage gating circuit using described in any of the above-described
Method, including step：
Voltage comparator gathers temperature-sensitive voltage and reference voltage after thermistor and reference resistance in real time；
The pressure difference that voltage comparator subtracts reference voltage temperature-sensitive voltage is inputted to voltage gating unit；
The outputting drive voltage when the pressure difference is negative value, the pressure difference be on the occasion of when output less than the driving voltage
Voltage.
(3) beneficial effect
The present invention is gathered in real time by a thermistor to mobile phone temp, and by being carried out with reference resistance value
Compare, to see if fall out default specification.Pass behind voltage gating circuit and carry out voltage selection, if preset beyond temperature
Value, then supply voltage is subjected to voltage division processing, reduces supply voltage, so as to reach reduction power consumption, reduce the requirement of temperature.Instead
It, then exported according to normal supply voltage.
Brief description of the drawings
Fig. 1 is that a kind of of the embodiment of the present invention shows driving voltage gating circuit structural representation.
Embodiment
With reference to the accompanying drawings and examples, the embodiment of the present invention is described in further detail.Implement below
Example is used to illustrate the present invention, but is not limited to the scope of the present invention.
The display driving voltage gating circuit of the present embodiment as shown in figure 1, including：Thermistor R, reference resistance Ref, electricity
Press comparator C and voltage gating unit.Thermistor R connects voltage input end VDD with the respective first ends of reference resistance Ref,
Respective second end connects voltage comparator C positive input terminal and negative input end, voltage comparator C output end connection electricity respectively
Press gating unit.Voltage gating unit is used for the outputting drive voltage when the voltage of positive input terminal is more than the voltage of negative input end,
The voltage of positive input terminal be less than or equal to output during the voltage of negative input end less than the driving voltage voltage (general mobile phone it is aobvious
Show that driving IC has a minimum voltage for being less than driving voltage, as long as actual input voltage is more than the minimum voltage, also can
Realize display).
Thermistor is that a kind of resistance value raises and the resistance of increase with temperature, in the present embodiment, selects reference resistance Ref
Resistance be resistance corresponding to temperature thresholds (such as 50 DEG C, think caloric value height more than 50 DEG C) of the thermistor R in setting.Hand
Machine temperature than it is relatively low when, thermistor R actual resistance is less than resistance corresponding to the temperature threshold, and voltage comparator C's is just defeated
The voltage of negative input end, now voltage gating unit selection outputting drive voltage, i.e. driven can be more than by entering the voltage at end.When
Mobile phone temp raises, during more than the temperature threshold so that it is corresponding that thermistor R actual resistance meets and exceeds the temperature threshold
Resistance, the voltage of voltage comparator C positive input terminal can be less than or equal to the voltage of negative input end, and now voltage gating unit selects
Voltage of the output less than driving voltage is selected, to reduce caloric value, reduces power consumption.
Specifically, as shown in dotted line frame in Fig. 1, voltage gating unit includes：First PMOS P1, the second PMOS P2,
First NMOS tube N1, the second NMOS tube N2, the 3rd NMOS tube N3, the 4th NMOS tube N4, first resistor R1 and second resistance R2.Its
In, the grid of each metal-oxide-semiconductor is all connected with voltage comparator C output end, the first PMOS P1 and the first respective sources of NMOS tube N1
Pole is all connected with high voltage end AVDD, and respective drain electrode is joined together to form first voltage output end out1, the 2nd NMOS
Pipe N2 source electrode passes through the first resistor R1 connections first voltage output end out1, drain electrode connection low-voltage end AVEE.
Second PMOS P2 and the 3rd respective source electrodes of NMOS tube N3 are all connected with low-voltage end AVEE, the respective shape that links together that drains
Into second voltage output end out2, the 4th NMOS tube N4 drain electrode by second resistance R2 connection second voltage output end out2,
Source electrode connection high voltage end AVDD.
Set the resistance under temperature threshold that can consider Rc as thermistor.Now select Ref=Rc；It is in addition side
Just circuit design, R3=R4, R5=R6=R7=R8, R1=R2 can be made；
The Ref when temperature is normal>R, i.e. Va<Vb, then Vc<0；Now N1, N2, N3 and N4 pipe end, P1 and P2 pipes
Open, Vout1 output AVDD voltages, Vout2 output AVEE voltages, both pressure differences are normal driving voltage.
The Ref when temperature is improper<R, i.e. Va>Vb, then Vc>0；Now N1, N2, N3 and N4 pipe are opened, P1 and P2 pipes
Son cut-off, the then internal resistance of N1 pipes, the internal resistance of R1 and N2 pipes carry out parallel connection, select suitable R1=R2 resistance, enter
Row partial pressure so that the Vout1 and Vout2 of output can meet the normal use of Mobile phone screen, and and can reduces input voltage.
In the present embodiment, reference resistance Ref resistance for thermistor R more than 50 DEG C of temperature when resistance, i.e. mobile phone
When temperature reaches 50 DEG C and some temperature value of the above, it is believed that caloric value is high, and actual temp value can be set with actual conditions.
In the present embodiment, by repeatedly test, preferably R1 and R2 resistance is the Ω of 400 Ω~450, now by R1
Mobile phone screen driving IC minimum voltage can be met with the output voltage after R2 partial pressures.
Respective second ends of thermistor R and reference resistance Ref are grounded by 3rd resistor R3 and the 4th resistance R4 respectively,
To prevent high current from burning out circuit.
In the present embodiment, respective second end of thermistor R and reference resistance Ref respectively by the 5th resistance R5 and
6th resistance R6 connection voltage comparators C positive input terminal and negative input end.5th resistance R5 and the 6th resistance R6 are used for impedance
Matching, for preventing that voltage is excessive, causes to burn out voltage comparator C, plays cushioning and protection.
In the present embodiment, voltage comparator C positive input terminal is grounded by the 7th resistance R7, to prevent high current from burning out ratio
Compared with device.
In the present embodiment, voltage comparator C negative input end is by the 8th resistance R8 connection output ends, the 8th resistance R8
Feedback resistance.
Present invention also offers a kind of voltage gating of the display driving voltage gating circuit using described in any of the above-described
Method, including step：
Voltage comparator gathers temperature-sensitive voltage and reference voltage after thermistor and reference resistance in real time.
The pressure difference that voltage comparator subtracts reference voltage temperature-sensitive voltage is inputted to voltage gating unit.
The outputting drive voltage when the pressure difference is negative value, the pressure difference be on the occasion of when output less than the driving voltage
Voltage.
Present invention also offers a kind of display device, the backlight module of the display device is included described in any of the above-described
Lighting device.The display device can be：Liquid crystal panel, oled panel, mobile phone, tablet personal computer, television set, display, notes
Any product or part with display function such as this computer, DPF, navigator.
Embodiment of above is merely to illustrate the present invention, and not limitation of the present invention, about the common of technical field
Technical staff, without departing from the spirit and scope of the present invention, it can also make a variety of changes and modification, thus it is all
Equivalent technical scheme falls within scope of the invention, and scope of patent protection of the invention should be defined by the claims.
Claims (9)
1. one kind shows driving voltage gating circuit, it is characterised in that including：Thermistor, reference resistance, voltage comparator and
Voltage gating unit；The thermistor connects voltage input end, respective second end point with the respective first end of reference resistance
Not Lian Jie voltage comparator positive input terminal and negative input end, it is single that the output end of the voltage comparator connects the voltage gating
Member, the outputting drive voltage when voltage that the voltage gating unit is used for positive input terminal is more than the voltage of negative input end, positive input
Output is less than the voltage of the driving voltage when voltage at end is less than or equal to the voltage of negative input end；
Wherein, the voltage gating unit includes：First PMOS, the second PMOS, the first NMOS tube, the second NMOS tube,
Three NMOS tubes, the 4th NMOS tube, first resistor and second resistance, the grid of each metal-oxide-semiconductor are all connected with the defeated of the voltage comparator
Go out end；
The respective source electrode of first PMOS and the first NMOS tube is all connected with high voltage end, the respective shape that links together that drains
Into first voltage output end, the source electrode of second NMOS tube connects the first voltage output end by the first resistor,
Drain electrode connection low-voltage end；
Second PMOS and the 3rd respective source electrode of NMOS tube are all connected with low-voltage end, the respective shape that links together that drains
Into second voltage output end, the drain electrode of the 4th NMOS tube connects the second voltage output end by the second resistance,
Source electrode connects high voltage end.
2. display driving voltage gating circuit as claimed in claim 1, it is characterised in that the resistance of the reference resistance is heat
Resistance when quick resistance is more than 50 DEG C of temperature.
3. display driving voltage gating circuit as claimed in claim 1, it is characterised in that the first resistor and second resistance
Resistance it is equal, resistance is the Ω of 400 Ω~450.
4. display driving voltage gating circuit as claimed in claim 1, it is characterised in that the thermistor and reference resistance
Respective second end passes through 3rd resistor and the 4th resistance eutral grounding respectively.
5. display driving voltage gating circuit as claimed in claim 1, it is characterised in that the thermistor and reference resistance
Respective second end connects the positive input terminal and negative input end of voltage comparator by the 5th resistance and the 6th resistance respectively.
6. display driving voltage gating circuit as claimed in claim 1, it is characterised in that the positive input of the voltage comparator
End passes through the 7th resistance eutral grounding.
7. display driving voltage gating circuit as claimed in claim 1, it is characterised in that the negative input of the voltage comparator
End connects output end by the 8th resistance.
8. a kind of display device, it is characterised in that including showing that driving voltage gates as any one of claim 1~7
Circuit.
9. a kind of voltage gating method of display driving voltage gating circuit using any one of claim 1~7, its
It is characterised by, including step：
Voltage comparator gathers temperature-sensitive voltage and reference voltage after thermistor and reference resistance in real time；
The pressure difference that voltage comparator subtracts reference voltage temperature-sensitive voltage is inputted to voltage gating unit；
The outputting drive voltage when the pressure difference is negative value, the pressure difference be on the occasion of when output less than the driving voltage electricity
Pressure.
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 CN105788538A (en) | 2016-07-20 |
| CN105788538B true CN105788538B (en) | 2018-03-09 |
Family
ID=56379674
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610323879.2A Active CN105788538B (en) | 2016-05-16 | 2016-05-16 | Show driving voltage gating circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105788538B (en) |
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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105788538A (en) | 2016-07-20 |
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