CN210270436U - Heating circuit for heating liquid crystal display - Google Patents
Heating circuit for heating liquid crystal display Download PDFInfo
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- CN210270436U CN210270436U CN201921253708.2U CN201921253708U CN210270436U CN 210270436 U CN210270436 U CN 210270436U CN 201921253708 U CN201921253708 U CN 201921253708U CN 210270436 U CN210270436 U CN 210270436U
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- temperature sensor
- liquid crystal
- crystal display
- heating
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Abstract
The utility model discloses a heating circuit for heating a liquid crystal display, belonging to the electronic field; the heating circuit comprises a thick film chip resistor, a temperature sensor chip, a field effect transistor and a controller; the temperature sensor chip is electrically connected with a heating power supply through a thick film resistor, and the temperature sensor is electrically connected with a liquid crystal display mainboard through a field effect transistor; the temperature sensor chip is interconnected with the controller through a pull-up resistor; the temperature sensor chip, the controller and the field effect transistor are matched to detect the external temperature, compare the detected temperature with the set temperature and send a judgment signal to control the field effect transistor; the thick film chip resistor, the temperature sensor chip and the long-acting stress tube are matched, when the field effect tube is conducted, the heating power supply is conducted and connected to the reinforced liquid crystal display mainboard, and heating processing is carried out on the reinforced liquid crystal display mainboard, so that the screen-splash phenomenon of the display is effectively avoided under the low-temperature environment, and normal display of the liquid crystal display is guaranteed.
Description
Technical Field
The utility model discloses a heating circuit of reinforced LCD relates to electron technical field.
Background
The reinforced liquid crystal display for industrial control and military industry has higher requirement on the environment, part of product equipment needs to be started in a low-temperature environment, and the lowest working temperature of part of products is required to reach minus 40 ℃ or even lower. In addition, the viscosity coefficient of the liquid crystal molecules is increased in a low-temperature environment, so that the response time is prolonged, and image smear and even screen blooming are caused. In order to ensure that the reinforced liquid crystal display can normally display in a low-temperature environment, the ambient temperature of liquid crystal molecules must meet the requirement of normal display, so a heating circuit capable of ensuring that the reinforced liquid crystal display can normally work in the low-temperature environment is designed.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to prior art's problem, provide a heating circuit with LCD, the technical scheme who adopts is: a heating circuit for heating a liquid crystal display comprises a thick film chip resistor, a temperature sensor chip, a field effect transistor and a controller;
the temperature sensor chip is electrically connected with a heating power supply through a thick film resistor, and the temperature sensor is electrically connected with a liquid crystal display mainboard through a field effect transistor;
the temperature sensor chip is interconnected with the controller by a pull-up resistor.
The controller adopts a CPLD controller.
The temperature sensor chip is an LM56CIMM chip and is interconnected with the CPLD controller through an OUT1 pin.
The field effect transistor is of an SI4410BDY model.
The utility model has the advantages that: the temperature sensor chip, the controller and the field effect transistor are matched to detect the external temperature, compare the detected temperature with the set temperature and send a judgment signal to control the field effect transistor; the thick film chip resistor, the temperature sensor chip and the long-acting stress tube are matched, when the field effect tube is conducted, the heating power supply is conducted and connected to the reinforced liquid crystal display mainboard, and heating processing is carried out on the reinforced liquid crystal display mainboard, so that the screen-splash phenomenon of the display is effectively avoided under the low-temperature environment, and normal display of the liquid crystal display is guaranteed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a block diagram of the working principle of the present invention; fig. 2 is a circuit principle of the present invention.
Detailed Description
The present invention is further described with reference to the following drawings and specific embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not to be construed as limiting the present invention.
The first embodiment is as follows:
a heating circuit for heating a liquid crystal display comprises a thick film chip resistor, a temperature sensor chip of LM56CIMM type, a field effect tube of SI4410BDY type and a CPLD controller;
the temperature sensor chip is electrically connected with a 5V direct current heating power supply through a thick film resistor, and the temperature sensor is electrically connected with a liquid crystal display mainboard through a field effect transistor;
the temperature sensor chip is interconnected with the CPLD controller through an OUT1 pin;
before the novel heating circuit is used, a worker sets the temperature at a required temperature value through a programming program of a CPLD controller, and then the novel heating circuit is connected to a reinforced liquid crystal display mainboard through a field effect tube;
when the novel heating circuit works, the temperature sensor chip detects the external temperature, the sensed temperature value information is output to the CPLD controller through OUT1 pin 7, when the detected temperature value information is lower than a set value, the CPLD controller feeds back information to the temperature sensor chip, the temperature sensor chip sends a high level signal to the field effect tube, the field effect tube is conducted after receiving the high level signal, and the heating power current enters the liquid crystal display mainboard after sequentially passing through the thick film resistor, the temperature sensor chip and the field effect tube;
when the reinforced liquid crystal display is normally started, the CPLD controller sends a command of closing heating to the temperature sensor chip and sends a low-level signal, when the field effect tube receives the low-level command, the field effect tube blocks, and the novel heating circuit can stop heating the reinforced liquid crystal display;
this novel heating circuit can be arranged in multiple LCD's that adds product, can effectively avoid the flower screen phenomenon of display under low temperature environment, guarantees LCD's normal demonstration, improves the reliability of adding LCD work under low temperature environment, and then improves LCD's using value.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (4)
1. A heating circuit for heating a liquid crystal display is characterized in that the heating circuit comprises a thick film chip resistor, a temperature sensor chip, a field effect transistor and a controller;
the temperature sensor chip is electrically connected with a heating power supply through a thick film resistor, and the temperature sensor is electrically connected with a liquid crystal display mainboard through a field effect transistor;
the temperature sensor chip is interconnected with the controller by a pull-up resistor.
2. The heating circuit of claim 1, wherein the controller is a CPLD controller.
3. The heating circuit of claim 2, wherein the temperature sensor chip is an LM56CIMM chip, and the temperature sensor chip is interconnected with the CPLD controller through an OUT1 pin.
4. The heating circuit of claim 1, wherein said fet is of the SI4410BDY type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921253708.2U CN210270436U (en) | 2019-08-05 | 2019-08-05 | Heating circuit for heating liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921253708.2U CN210270436U (en) | 2019-08-05 | 2019-08-05 | Heating circuit for heating liquid crystal display |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210270436U true CN210270436U (en) | 2020-04-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921253708.2U Active CN210270436U (en) | 2019-08-05 | 2019-08-05 | Heating circuit for heating liquid crystal display |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210270436U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111796987A (en) * | 2020-07-14 | 2020-10-20 | 山东超越数控电子股份有限公司 | Device and method for monitoring and controlling internal temperature of computer based on single chip microcomputer |
-
2019
- 2019-08-05 CN CN201921253708.2U patent/CN210270436U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111796987A (en) * | 2020-07-14 | 2020-10-20 | 山东超越数控电子股份有限公司 | Device and method for monitoring and controlling internal temperature of computer based on single chip microcomputer |
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