CN102662266A - Liquid crystal screen heating controller and heating method - Google Patents
Liquid crystal screen heating controller and heating method Download PDFInfo
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- CN102662266A CN102662266A CN2012101592322A CN201210159232A CN102662266A CN 102662266 A CN102662266 A CN 102662266A CN 2012101592322 A CN2012101592322 A CN 2012101592322A CN 201210159232 A CN201210159232 A CN 201210159232A CN 102662266 A CN102662266 A CN 102662266A
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Abstract
The invention discloses a liquid crystal screen heating controller and a heating method, and belongs to the technical field of liquid crystal screen heating. The problem that a liquid crystal screen is damaged easily by the conventional heating mode is solved. A temperature sensor is used for acquiring ambient temperature of the liquid crystal screen; the temperature signal output end of the temperature sensor is connected with the temperature signal input end of a temperature judgment circuit; the heating signal output end of the temperature judgment circuit is connected with the heating control signal input end of a pulse width modulation (PWM) signal generation circuit; the pulse signal output end of the PWM signal generation circuit is connected with the heating control signal input end of a heating control circuit; the heater driving signal output end of the heating control circuit is connected with the control signal input end of a heater; and the heater is used for heating the ambient in which the liquid crystal screen is positioned. The liquid crystal screen heating controller and the heating method are suitable for liquid crystal screen heating.
Description
Technical field
The present invention relates to a kind of liquid crystal display heating controller and heating means, belong to the liquid crystal display technical field of heating.
Background technology
Usually, the low temperature limit working temperature of liquid crystal display is-30 ℃, in order to make liquid crystal display under low temperature environment more, for example still keeps work at-40 ℃ cold district, need heat liquid crystal display.The circuit that existing heating means adopt is as shown in Figure 4, through the temperature value of single-chip microcomputer collection liquid crystal display environment of living in, when temperature value is lower than-20 ℃; HEATER PWM mouth in the circuit is set to high level; The work of driving well heater when temperature value is higher than 20 ℃, stops heating.This heating means circuit structure is simple, and type of drive is succinct, but there is following defective in it, when HEATER PWM port is damaged, when exporting high level for a long time, possibly cause the heating work of liquid crystal display uncontrolled, thereby long-term heating causes liquid crystal display to damage.
Summary of the invention
The present invention is in order to solve the existing mode that liquid crystal display is heated, to be prone to cause the problem of liquid crystal display damage, a kind of liquid crystal display heating controller and heating means being provided.
Liquid crystal display heating controller according to the invention, it comprises temperature sensor and temperature decision circuitry, it also comprises pwm signal generation circuit, heating control circuit and well heater,
Temperature sensor is used to gather the residing environment temperature of liquid crystal display; The temperature signal output terminal of temperature sensor connects the temperature signal input end of temperature decision circuitry; The heating signal output terminal of temperature decision circuitry connects the heating signal input end of pwm signal generation circuit; The pulse signal output end of pwm signal generation circuit connects the heating signal input end of heating control circuit; The heater-driven signal output part of heating control circuit connects the signal input end of well heater, and well heater is used for liquid crystal display environment of living in is heated.
The structure of heating control circuit is:
The heating signal input end of heating control circuit connects an end of first electric capacity; The other end of first electric capacity connects the positive pole of first diode; The negative pole of first diode connects the grid of insulated gate field-effect pipe; The source electrode of insulated gate field-effect pipe connects heating power supply ground, is connected resistance between the grid of insulated gate field-effect pipe and the source electrode, and resistance is associated with second electric capacity; The positive pole of second diode connects heating power supply ground, and the negative pole of second diode is connected between first electric capacity and first diode;
The drain electrode of insulated gate field-effect pipe connects the heating signal input end of well heater.
Said insulated gate field-effect pipe is a N raceway groove insulated gate field-effect pipe.
Based on the liquid crystal display heating means of above-mentioned liquid crystal display heating controller, it may further comprise the steps:
Step 1: temperature sensor is gathered the residing environment temperature of liquid crystal display, and sends to the temperature decision circuitry;
Step 2: the temperature decision circuitry judges whether the temperature value that receives is lower than-20 ℃, if, execution in step three; Otherwise, return step 1;
Step 3: temperature decision circuitry control pwm signal generation circuit produces pwm signal and exports to heating control circuit, the heating of heating control circuit control heater, and then realize the residing environment of liquid crystal display is heated; Execution in step four then;
Step 4: temperature sensor is gathered the residing environment temperature of liquid crystal display, and sends to the temperature decision circuitry; Execution in step five then;
Step 5: the temperature decision circuitry judges whether the temperature value that receives is higher than 20 ℃, if, execution in step six; Otherwise, return step 3:
Step 6: stop heating; Return step 1.
Advantage of the present invention is: the present invention is safer to the heat driven of liquid crystal display; Heating signal input end when heating control circuit; Be that HEATER PWM port is damaged, make when it exports high level for a long time, also can not cause liquid crystal display to be in heated condition for a long time; Can protect liquid crystal display can not to be damaged more effectively, make the heating of liquid crystal display safer because heating is not controlled.
Description of drawings
Fig. 1 is the principle schematic of heating controller of the present invention;
Fig. 2 is the circuit theory diagrams of heating control circuit;
Fig. 3 is the process flow diagram of heating means of the present invention;
Fig. 4 is the existing circuit structure diagram that liquid crystal display is added thermal recovery.
Embodiment
Embodiment one: this embodiment is described below in conjunction with Fig. 1 and Fig. 2; The said liquid crystal display heating controller of this embodiment; It comprises temperature sensor 1 and temperature decision circuitry 2, and it also comprises pwm signal generation circuit 3, heating control circuit 4 and well heater 5
Temperature sensor 1 is used to gather the residing environment temperature of liquid crystal display; The temperature signal output terminal of temperature sensor 1 connects the temperature signal input end of temperature decision circuitry 2; The heating signal output terminal of temperature decision circuitry 2 connects the heating signal input end of pwm signal generation circuit 3; The pulse signal output end of pwm signal generation circuit 3 connects the heating signal input end of heating control circuit 4; The heater-driven signal output part of heating control circuit 4 connects the signal input end of well heater 5, and well heater 5 is used for liquid crystal display environment of living in is heated.
Embodiment two: below in conjunction with Fig. 1 and Fig. 2 this embodiment is described, this embodiment is for to the further specifying of embodiment one, and the structure of heating control circuit 4 is:
The heating signal input end of heating control circuit 4 connects an end of first capacitor C 1; The other end of first capacitor C 1 connects the positive pole of the first diode RD1; The negative pole of the first diode RD1 connects the grid of insulated gate field-effect pipe QT; The source electrode of insulated gate field-effect pipe QT connects heating power supply ground, is connected resistance R between the grid of insulated gate field-effect pipe QT and the source electrode, and resistance R is associated with second capacitor C 2; The positive pole of the second diode RD2 connects heating power supply ground, and the negative pole of the second diode RD2 is connected between first capacitor C 1 and the first diode RD1;
The drain electrode of insulated gate field-effect pipe QT connects the heating signal input end of well heater 5.
Embodiment three: below in conjunction with Fig. 2 this embodiment is described, this embodiment is for to the further specifying of embodiment two, and said insulated gate field-effect pipe QT is a N raceway groove insulated gate field-effect pipe.
Embodiment four: below in conjunction with Fig. 1 to Fig. 3 this embodiment is described, this embodiment is that it may further comprise the steps based on the liquid crystal display heating means of the said liquid crystal display heating controller of above-mentioned embodiment:
Step 1: temperature sensor 1 is gathered the residing environment temperature of liquid crystal display, and sends to temperature decision circuitry 2;
Step 2: temperature decision circuitry 2 judges whether the temperature value that receives is lower than-20 ℃, if, execution in step three; Otherwise, return step 1;
Step 3: temperature decision circuitry 2 control pwm signal generation circuit 3 produce pwm signal and export to heating control circuit 4,5 heatings of heating control circuit 4 control heaters, and then realize the residing environment of liquid crystal display is heated; Execution in step four then;
Step 4: temperature sensor 1 is gathered the residing environment temperature of liquid crystal display, and sends to temperature decision circuitry 2; Execution in step five then;
Step 5: temperature decision circuitry 2 judges whether the temperature value that receives is higher than 20 ℃, if, execution in step six; Otherwise, return step 3:
Step 6: stop heating; Return step 1.
In this embodiment, when the temperature value of temperature sensor 1 collection was lower than-20 ℃, HEATER PWM port was set to pulse signal among Fig. 2; Drive well heater 5 work; When temperature was higher than 20 ℃, the pulse signal of HEATER PWM port stopped output, made well heater 5 stop heating.
In this embodiment,, can not cause liquid crystal display to be in heated condition for a long time even HEATER PWM port is exported high level or low level for a long time among Fig. 2 yet.
Claims (4)
1. liquid crystal display heating controller, it comprises temperature sensor (1) and temperature decision circuitry (2), it is characterized in that: it also comprises pwm signal generation circuit (3), heating control circuit (4) and well heater (5),
Temperature sensor (1) is used to gather the residing environment temperature of liquid crystal display; The temperature signal output terminal of temperature sensor (1) connects the temperature signal input end of temperature decision circuitry (2); The heating signal output terminal of temperature decision circuitry (2) connects the heating signal input end of pwm signal generation circuit (3); The pulse signal output end of pwm signal generation circuit (3) connects the heating signal input end of heating control circuit (4); The heater-driven signal output part of heating control circuit (4) connects the signal input end of well heater (5), and well heater (5) is used for liquid crystal display environment of living in is heated.
2. liquid crystal display heating controller according to claim 1; It is characterized in that: the structure of heating control circuit (4) is: the heating signal input end of heating control circuit (4) connects an end of first electric capacity (C1); The other end of first electric capacity (C1) connects the positive pole of first diode (RD1); The negative pole of first diode (RD1) connects the grid of insulated gate field-effect pipe (QT); The source electrode of insulated gate field-effect pipe (QT) connects heating power supply ground, is connected resistance (R) between the grid of insulated gate field-effect pipe (QT) and the source electrode, and resistance (R) is associated with second electric capacity (C2); The positive pole of second diode (RD2) connects heating power supply ground, and the negative pole of second diode (RD2) is connected between first electric capacity (C1) and first diode (RD1);
The drain electrode of insulated gate field-effect pipe (QT) connects the heating signal input end of well heater (5).
3. liquid crystal display heating controller according to claim 2 is characterized in that: said insulated gate field-effect pipe (QT) is a N raceway groove insulated gate field-effect pipe.
4. liquid crystal display heating means based on the said liquid crystal display heating controller of claim 1, it is characterized in that: it may further comprise the steps:
Step 1: temperature sensor (1) is gathered the residing environment temperature of liquid crystal display, and sends to temperature decision circuitry (2);
Step 2: temperature decision circuitry (2) judges whether the temperature value that receives is lower than-20 ℃, if, execution in step three; Otherwise, return step 1;
Step 3: temperature decision circuitry (2) control pwm signal generation circuit (3) produces pwm signal and exports to heating control circuit (4), heating control circuit (4) control heater (5) heating, and then realize the residing environment of liquid crystal display is heated; Execution in step four then;
Step 4: temperature sensor (1) is gathered the residing environment temperature of liquid crystal display, and sends to temperature decision circuitry (2); Execution in step five then;
Step 5: temperature decision circuitry (2) judges whether the temperature value that receives is higher than 20 ℃, if, execution in step six; Otherwise, return step 3:
Step 6: stop heating; Return step 1.
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| CN2012101592322A CN102662266A (en) | 2012-05-22 | 2012-05-22 | Liquid crystal screen heating controller and heating method |
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| CN2012101592322A CN102662266A (en) | 2012-05-22 | 2012-05-22 | Liquid crystal screen heating controller and heating method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103412426A (en) * | 2013-07-26 | 2013-11-27 | 北京京东方光电科技有限公司 | Liquid crystal display (LCD) |
| CN105759479A (en) * | 2016-03-28 | 2016-07-13 | 华立科技股份有限公司 | Liquid crystal heating device with communication function and control method |
| CN105759478A (en) * | 2016-03-28 | 2016-07-13 | 华立科技股份有限公司 | Liquid crystal display screen heating device and control method |
| CN106094304A (en) * | 2016-06-18 | 2016-11-09 | 青岛鼎信通讯股份有限公司 | A kind of liquid crystal display screen automatic heating control method under low temperature environment |
| CN106228941A (en) * | 2016-08-23 | 2016-12-14 | 苏州亿科斯通电气有限公司 | A kind of method and device of spreading number pattern LCD temperature range |
| CN106226933A (en) * | 2016-08-30 | 2016-12-14 | 京东方科技集团股份有限公司 | Feedback circuit, heater circuit, display device and display system |
| CN107560702A (en) * | 2017-09-07 | 2018-01-09 | 宁夏软件工程院有限公司 | Electronic scale |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103412426A (en) * | 2013-07-26 | 2013-11-27 | 北京京东方光电科技有限公司 | Liquid crystal display (LCD) |
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| CN105759478A (en) * | 2016-03-28 | 2016-07-13 | 华立科技股份有限公司 | Liquid crystal display screen heating device and control method |
| CN105759479B (en) * | 2016-03-28 | 2019-01-22 | 华立科技股份有限公司 | Liquid crystal heating device and control method with communication function |
| CN105759478B (en) * | 2016-03-28 | 2019-01-22 | 华立科技股份有限公司 | Liquid crystal display heating device and control method |
| CN106094304A (en) * | 2016-06-18 | 2016-11-09 | 青岛鼎信通讯股份有限公司 | A kind of liquid crystal display screen automatic heating control method under low temperature environment |
| CN106228941A (en) * | 2016-08-23 | 2016-12-14 | 苏州亿科斯通电气有限公司 | A kind of method and device of spreading number pattern LCD temperature range |
| CN106226933A (en) * | 2016-08-30 | 2016-12-14 | 京东方科技集团股份有限公司 | Feedback circuit, heater circuit, display device and display system |
| WO2018040744A1 (en) * | 2016-08-30 | 2018-03-08 | 京东方科技集团股份有限公司 | Feedback circuit, heating circuit, display device, and display system |
| US10795198B2 (en) | 2016-08-30 | 2020-10-06 | Boe Technology Group Co., Ltd. | Feedback circuit, heating circuit, display apparatus and display system |
| CN107560702A (en) * | 2017-09-07 | 2018-01-09 | 宁夏软件工程院有限公司 | Electronic scale |
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Application publication date: 20120912 |