CN101763126A - Wide-temperature control device for LCD (liquid crystal display) - Google Patents
Wide-temperature control device for LCD (liquid crystal display) Download PDFInfo
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- CN101763126A CN101763126A CN200810188325A CN200810188325A CN101763126A CN 101763126 A CN101763126 A CN 101763126A CN 200810188325 A CN200810188325 A CN 200810188325A CN 200810188325 A CN200810188325 A CN 200810188325A CN 101763126 A CN101763126 A CN 101763126A
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Abstract
The present invention mainly relates to a wide-temperature control device for LCDs (liquid crystal display), which belongs to a control circuit based on a temperature sampling and controlling theory. Traditional electrical heating control systems generally adopt relay control techniques, and hardware with fixed wiring is used for logic control, so a control system has the disadvantages of large volume, high power consumption, low efficiency and high failure rate, which can not guarantee normal industrial production. Along with the development of computer control technology, the traditional relay control technique is inevitably substituted by PLC control technique based on computer technology. Because of the excellent performance of the PLC, a temperature control system based on PLC control is economy, efficient, stable and easy to maintain. In order to keep an LCD normally working at the temperature lower than the normal working temperature of the LCD, a special LCD working at low temperature is required or a heating apparatus needs to be added on a common LCD. The present invention is designed to add a temperature control device on a common LCD so that the LCD can normally work at temperature lower than the normal working temperature of the LCD. A heating circuit is adopted for heating the LCD to keep the LCD normally working, thus guaranteeing that the LCD can work at a wider temperature range. The wide-temperature control device for LCDs realizes functions by means of temperature sampling, processing and control modules, is mainly used for LCD working at low temperature, other products such as instruments and meters for military use or outdoor use, and the like requiring transparent heating, defrosting and defogging, and meanwhile has favorable visible light transmittance.
Description
Technical field
The design's invention belongs to a kind of control circuit, relates generally to a kind of LCD LCD wide-temperature control device.Can in wideer temperature range, work in order to guarantee the LCD LCD.
Background technology
Traditional heating electric control system generally adopts the relay control technology, owing to adopt the hardware of link to realize logic control, the volume of control system is increased, power consumption is many, efficient is not high and easy break-down, can not guarantee normal commercial production.Along with the development of Computer Control Technology, traditional relay control technology is inevitable to be replaced by the PLC control technology that produces based on computer technology.And the excellent performance of PLC itself makes the temperature control system based on PLC control become economical, efficient, stable and easy to maintenance.This temperature control system has universal significance to traditional relay control system.Present equipment is used environment requirement more and more harsher, temperature requirement is also more and more higher, in order to guarantee under the environment of abominable (particularly low temperature), to use LCD, just require LCD that very wide operating temperature range must be arranged, will increase very big financial cost like this.The working temperature of most lcd products is all between 0～50 ℃ in the market, and when environment temperature was lower than 0 ℃, LCD at all can't operate as normal, has brought very big inconvenience to work on the spot.In order under the lower environment of temperature, to use LCD, two kinds of methods are arranged at present, that is exactly the low temperature liquid crystal display made from special material, prices are rather stiff for this LCD, change the ambient operating temperature of LCD besides, such as heating apparatus is installed on display.The present invention's design will be installed temperature control equipment exactly on the basis of common liquid crystals display, so just can guarantee when environment temperature is lower than the normal working temperature of LCD, heat and make the LCD operate as normal by adding circuit temperature feeding crystal display, so just can guarantee that LCD can work in the temperature range of more widening.
Summary of the invention
The wide-temperature control device that the purpose of this invention is to provide a kind of LCD LCD.The present invention utilizes temperature acquisition, processing, control three big functional modules to realize its function.Its principle is as shown in Figure 1:
This invention is mainly used in low temperature environment LCD LCD and other need the product of transparent heating/defrosting/demist such as the instrument and meter of military or outdoor use etc., has good visible light transmissivity simultaneously.
The employed temperature sensor of temperature collect module is PT100 in the present invention, and the characteristic index of this sensor is as follows:
1. temperature-measuring range :-200-400 ℃
2. probe length: 5cm/10cm/15cm/20cm
3. probe diameter: Ф 5mm
4. resistance variations: 0.3851 Ω/℃
5. mounting means: movable screw is fixed
6. screw specification: M8*1.0
7. wire length: general 2 meters, can customized length (dedicated pin)
8. wire connection: three-wire type
9. the mode of connection: wiring fork
10. sleeve pipe material: stainless steel
11. senser element: PT (platinum)
The pt100 type temperature sensor that the design invents employing has the advantage of the following aspects:
1. stainless steel sleeve pipe encapsulation, durable in use
2. movable screw is fixed, and is easy to use
3. make plug and play according to international IEC751 international standard
Many kinds of probe size optional, adapt to wide
5. high precision, high stability, high sensitivity
6. profile is small and exquisite, and is economical and practical
Adopt the mode of connection of three-wire type when serviceability temperature sensor PT100, fundamental purpose is to reduce the influence that outer bound pair is measured, and increases measuring accuracy.Resistance value is 100 Ω during 0 ℃ of PT100 temperature sensor, resistance change rate be 0.3851 Ω/℃.Because its resistance value is little, highly sensitive, so the resistance of lead-in wire can not be ignored, adopt the three-wire type connection can eliminate the measuring error that the lead-in wire line resistance brings, principle is as follows:
Three sectional area of wire that PT100 draws and identical length are with (being r1=r2=r3), the circuit of measuring platinum resistance generally is a unbalanced bridge, platinum resistance (Rpt100) is as an arm resistance of electric bridge, lead one (r1) is received the power end of electric bridge, all the other two (r2, r3) receive the brachium pontis at platinum resistance place respectively and the brachium pontis that is adjacent on, such two brachium pontis have all been introduced the lead resistance of similar resistance, electric bridge is in equilibrium state, the lead-in wire line resistance variation to measurement result without any influence.In the design of LCD heating film control circuit, mainly consider following technical indicator:
1.560nm wavelength visible light transmissivity T 〉=75%;
2. operating ambient temperature is-50 ℃～+ 20 ℃, and heating surface temperature unevenness is ± 2 ℃;
3. electrode is safe and reliable, and weldability is strong, the product good heat resistance;
4. base material is the transparent basement membrane of PET;
5. face does not have folding line, falls film; There are not obvious dirty point, bubble, scratch, scuffing, pit, stain, mist spot, color spot; The obvious bur that does not have obvious snotter and can not remove; Is principle for the open defect that can't quantize not influence display effect;
Thickness evenly, surfacing, peripheral straight no burr;
7. can develop various well heaters according to the various special requirements of user;
The signal that is collected by the PT100 temperature sensor will be sent to the analog acquisition expansion module of PLC, the temperature value that temperature signal of behind PLC controller and the analog acquisition module communication PT100 being gathered and user set by LCD compares, when having collected the lower limit that temperature value is set less than the user, PLC just exports a pulse and controls the connection of heating film power circuit, thereby make the work of heating film heater circuit, the temperature of LCD rises, when temperature upper limit that the temperature value that collects is set greater than the user, pulse of PLC controller output is controlled the heating film power circuit and is turn-offed, thereby the heating film heater circuit is quit work, and the temperature of LCD descends.So repeatedly, the temperature that just can guarantee LCD is all worked between upper temperature limit that the user sets and lower limit.Thereby guaranteed the wide temperature work of LCD.
Description of drawings
Accompanying drawing 1 is design concept figure of the present invention.
As can be seen from Figure 1: the present invention includes four main component units, they are temperature sensor temperature collection circuit, PLC processor data comparator circuit, heating film power circuit and heating film heater circuit.
Accompanying drawing 2 is structural representations of the present invention.
As can be seen from Figure 2: the feed circuit that the present invention includes PLC master controller, PLC analog acquisition unit, LCD, temperature acquisition sensor PT100, heating film circuit and heating film.The direction of arrow shown in the figure is represented the flow direction of signal and control.
Embodiment
In conjunction with the accompanying drawings, specify specific embodiments of the invention.
As shown in Figure 2: the feed circuit that the present invention includes PLC master controller, PLC analog acquisition unit, LCD, temperature acquisition sensor PT100, heating film circuit and heating film.
Engage accompanying drawing 2, the temperature control implementation procedure of LCD temperature-control circuit is: at first temperature sensor PT100 is sent to the temperature information of LCD in the PLC controller by the analog acquisition unit that PLC expands, after PLC obtains temperature signal that temperature sensor collects, the temperature value of setting from LCD with the user compares, when the temperature value that collects is lower than the temperature value of user's setting, the PLC control module will be given trigger pulse of heating film feed circuit by the phase shift trigger module, the heating film feed circuit begin to power to heating film like this, after heating film heats to LCD, the temperature of LCD begins to rise, when the temperature value of returning from the temperature sensor collection surpasses the temperature upper limit that the user sets by LCD, the PLC control module can be given trigger pulse of heating film by the phase shift trigger module again, this is that the heating film feed circuit stop to the heating film power supply, and this moment, the temperature of LCD began again to descend.So repeatedly, thus guaranteed that LCD is operated within the working temperature that the user sets always, has also just guaranteed the operate as normal of LCD.In the The whole control circuit, PLC is the core of control circuit, plays crucial effects in control.
Claims (3)
1. LCD LCD wide-temperature control device the present invention includes the feed circuit of PLC master controller, PLC analog acquisition unit, LCD, temperature acquisition sensor PT100, heating film circuit and heating film.The direction of arrow shown in the figure is represented the flow direction of signal and control.
It is characterized in that: temperature collecting cell adopts temperature acquisition sensor PT100, and the power circuit of heating film is by PLC the relatively back output pulse of collecting temperature and user's design temperature to be controlled.
2. a kind of LCD LCD wide-temperature control device according to claim 1 is characterized in that: the bound user of control temperature can establish.
3. a kind of LCD LCD wide-temperature control device according to claim 1, it is characterized in that: the temperature acquisition data are directly sent PLC analog acquisition unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810188325A CN101763126A (en) | 2008-12-25 | 2008-12-25 | Wide-temperature control device for LCD (liquid crystal display) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810188325A CN101763126A (en) | 2008-12-25 | 2008-12-25 | Wide-temperature control device for LCD (liquid crystal display) |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101763126A true CN101763126A (en) | 2010-06-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200810188325A Pending CN101763126A (en) | 2008-12-25 | 2008-12-25 | Wide-temperature control device for LCD (liquid crystal display) |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102412171A (en) * | 2011-07-29 | 2012-04-11 | 铜陵富仕三佳机械有限公司 | Heating control device used for packaging equipment |
| CN102520743A (en) * | 2011-11-28 | 2012-06-27 | 华为技术有限公司 | Temperature control method, system, system and base station equipment |
| CN103019270A (en) * | 2012-09-29 | 2013-04-03 | 中国北车集团大连机车研究所有限公司 | Locomotive driver display unit with low-temperature pre-heating function |
| CN114397778A (en) * | 2021-12-30 | 2022-04-26 | 惠科股份有限公司 | Display heating compensation method, device and system |
-
2008
- 2008-12-25 CN CN200810188325A patent/CN101763126A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102412171A (en) * | 2011-07-29 | 2012-04-11 | 铜陵富仕三佳机械有限公司 | Heating control device used for packaging equipment |
| CN102412171B (en) * | 2011-07-29 | 2013-05-08 | 铜陵富仕三佳机械有限公司 | Heating control device used for packaging equipment |
| CN102520743A (en) * | 2011-11-28 | 2012-06-27 | 华为技术有限公司 | Temperature control method, system, system and base station equipment |
| CN102520743B (en) * | 2011-11-28 | 2014-05-07 | 华为技术有限公司 | Temperature control method, system, and base station equipment |
| CN103019270A (en) * | 2012-09-29 | 2013-04-03 | 中国北车集团大连机车研究所有限公司 | Locomotive driver display unit with low-temperature pre-heating function |
| CN103019270B (en) * | 2012-09-29 | 2015-09-30 | 中国北车集团大连机车研究所有限公司 | There is the engine driver display unit that low temperature preheats function |
| CN114397778A (en) * | 2021-12-30 | 2022-04-26 | 惠科股份有限公司 | Display heating compensation method, device and system |
| CN114397778B (en) * | 2021-12-30 | 2023-10-10 | 惠科股份有限公司 | Display heating compensation method, device and system |
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| DD01 | Delivery of document by public notice |
Addressee: Beijing Hangfeng Kewei Equipment Technology Co., Ltd. Sun Junqi Document name: the First Notification of an Office Action |
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Addressee: Beijing Hangfeng Kewei Equipment Technology Co., Ltd. Sun Junqi Document name: Notification that Application Deemed to be Withdrawn |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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Application publication date: 20100630 |