CN114489246A - Automatic defogging system and method for PDA screen - Google Patents
Automatic defogging system and method for PDA screen Download PDFInfo
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- CN114489246A CN114489246A CN202111636596.0A CN202111636596A CN114489246A CN 114489246 A CN114489246 A CN 114489246A CN 202111636596 A CN202111636596 A CN 202111636596A CN 114489246 A CN114489246 A CN 114489246A
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 79
- 238000001514 detection method Methods 0.000 claims abstract description 23
- 230000006698 induction Effects 0.000 claims description 16
- 239000012528 membrane Substances 0.000 claims description 4
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 206010063385 Intellectualisation Diseases 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 239000010408 film Substances 0.000 description 32
- 238000010586 diagram Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
- G06F1/1613—Constructional details or arrangements for portable computers
- G06F1/1626—Constructional details or arrangements for portable computers with a single-body enclosure integrating a flat display, e.g. Personal Digital Assistants [PDAs]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
- G06F1/1613—Constructional details or arrangements for portable computers
- G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
- G06F1/1637—Details related to the display arrangement, including those related to the mounting of the display in the housing
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/30—Monitoring
- G06F11/3058—Monitoring arrangements for monitoring environmental properties or parameters of the computing system or of the computing system component, e.g. monitoring of power, currents, temperature, humidity, position, vibrations
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/02—Details
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Abstract
The invention provides an automatic defogging system and method for a PDA screen, wherein the system comprises a screen, a heat conducting film, a power supply module, a CPU module, a temperature detection module, a sensing module and a heating control module, wherein the sensing module is used for sensing whether the screen is shielded or not; the heat conducting film is electrically connected with the heating control module. The temperature detection module is adopted to detect the ambient temperature constantly, and when the ambient temperature is low but the screen is not fogged, the screen is automatically heated at the first constant temperature, so that the screen is prevented from being fogged; when the environmental temperature is low and the screen is fogged, the screen is automatically heated at the second constant temperature, so that the fog is removed, the PDA can normally work when entering a low-temperature environment, the PDA parts are prevented from being in a humid environment for a long time, and the service life of the PDA is prolonged; the PDA system has the characteristics of automation, intellectualization and energy conservation, does not need manual operation of a user, and can improve the application adaptability of the PDA in a normal-temperature environment and a low-temperature environment.
Description
Technical Field
The invention relates to the technical field of defogging control, in particular to an automatic defogging system and method for a PDA screen.
Background
The code scanning type mobile equipment is increasingly used in cold chain transportation or cold storage. The PDA suitable for the freezer is faced with a big problem that when the PDA enters the freezer from the normal temperature environment, the PDA screen quickly becomes fog or even the fog is condensed due to the temperature difference. The most direct influence of the fogging of the PDA screen is that the screen is blurred, the data downloading work in the next stage cannot be carried out, and the normal work flow is influenced. In addition, the fogging of the screen can also cause damage to the PDA parts, shortening the service life of the PDA. In the use of the existing PDA, when a screen is fogged, a user needs to manually turn on a defogging (heating) function key, the operation is troublesome, and the resource waste is possibly caused by the fact that the user forgets to turn off the defogging (heating) function key.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides an automatic defogging system and method for a PDA screen.
In order to achieve the purpose, the invention adopts the following technical scheme:
an automatic defogging system of a PDA screen comprises the screen, a heat conduction film, a power supply module, a CPU module, a temperature detection module, an induction module and a heating control module, wherein the CPU module, the temperature detection module, the induction module and the heating control module are respectively and electrically connected with the power supply module, and the temperature detection module, the induction module and the heating control module are respectively and electrically connected with the CPU module; the CPU module is used for processing data; the temperature detection module is used for detecting the ambient temperature of the PDA and feeding back the ambient temperature to the CPU module; the sensing module is arranged on the back of the screen, the sensing end of the sensing module faces the screen, and the sensing module is used for sensing whether the screen is shielded or not; the heat conduction film is attached to the back face of the screen and electrically connected with the heating control module.
Preferably, the heat conducting film is provided with a through hole, and the sensing module is correspondingly arranged at the through hole.
Preferably, the sensing module comprises an infrared transmitter and an infrared receiver, the infrared transmitter is used for transmitting infrared light, and the infrared receiver is used for receiving infrared light; when the infrared transmitter transmits infrared light and the infrared receiver receives the reflected infrared light, the screen is shielded.
Preferably, the heating control module has a first operation mode and a second operation mode, in the first operation mode, the heating control module supplies a first constant temperature heating current to the heat-conducting membrane, and the heat-conducting membrane generates heat at a first constant temperature; in the second working mode, the heating control module supplies a second constant temperature heating current to the heat-conducting film, and the heat-conducting film generates heat at a second constant temperature.
Preferably, the heat conduction film is an ITO heat conduction film.
Preferably, the temperature detection module is a thermistor.
The invention also provides an automatic defogging method for the PDA screen, which comprises the following steps:
the temperature detection module constantly detects the ambient temperature and feeds the ambient temperature back to the CPU module, and the CPU module compares the ambient real-time temperature with a preset temperature threshold value and judges whether the ambient temperature is lower than the preset temperature threshold value or not;
when the real-time ambient temperature is greater than the preset temperature threshold, the induction module and the heating control module do not work;
when the real-time temperature of the environment is less than or equal to a preset temperature threshold value, the sensing module is started, and whether the screen is shielded or not is detected by utilizing an infrared sensing principle; if the induction module does not detect that the screen is shielded, the CPU module controls the heating control module to enter a first working mode, the heating control module conducts first constant-temperature heating current to the heat conducting film, and the heat conducting film heats at a first constant-temperature to perform constant-temperature heating on the screen; if the induction module detects that the screen is shielded continuously for 30 seconds, the CPU module controls the heating control module to enter a second working mode, the heating control module conducts second constant-temperature heating current to the heat conducting film, and the heat conducting film heats at the second constant-temperature to heat the screen at the constant temperature.
Preferably, the preset temperature threshold is 0 ℃.
Preferably, the first constant temperature heating current is less than the second constant temperature heating current, and the first constant temperature is less than the second constant temperature.
Further, the first constant-temperature heating current is 0.1A, the second constant-temperature heating current is 0.8A, the first constant-temperature is 0 ℃, and the second constant-temperature is 15 ℃.
Compared with the prior art, the invention has the beneficial effects that: the temperature detection module is adopted to detect the ambient temperature constantly, and when the ambient temperature is low but the screen is not fogged, the screen is automatically heated at the first constant temperature, so that the screen is prevented from being fogged; when the environmental temperature is low and the screen is fogged, the screen is automatically heated at the second constant temperature, so that the fog is removed, the PDA can normally work when entering a low-temperature environment, the PDA parts are prevented from being in a humid environment for a long time, and the service life of the PDA is prolonged; the automatic demisting system and the method for the PDA screen have the characteristics of automation, intellectualization and energy conservation, do not need manual operation of a user, and can improve the application suitability of the PDA in normal temperature environment and low temperature environment.
Drawings
FIG. 1 is a block diagram of an automatic defogging system for a PDA screen in accordance with the present invention;
FIG. 2 is a block diagram of a PDA according to embodiment 1 of the present invention;
fig. 3 is a sectional view of a screen, a heat conductive film and an induction module in example 1 of the present invention;
FIG. 4 is a structural view of a heat conductive film in example 1 of the present invention;
FIG. 5 is a flowchart illustrating an automatic defogging method for a PDA screen according to the present invention.
In the figure, 10-screen, 20-heat conducting film, 21-transmission hole, 30-power module, 40-CPU module, 50-temperature detection module, 60-induction module, 61-infrared emitter, 62-infrared receiver and 70-heating control module.
Detailed Description
In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.
Referring to fig. 1 to 4, fig. 1 is a block diagram of an automatic defogging system for a PDA screen according to the present invention; FIG. 2 is a block diagram of a PDA according to embodiment 1 of the present invention; fig. 3 is a sectional view of a screen, a heat conductive film and an induction module in example 1 of the present invention; fig. 4 is a structural view of a heat conductive film in embodiment 1 of the present invention.
The automatic defogging system for the PDA screen comprises a screen 10, a heat conducting film 20, a power supply module 30, a CPU module 40, a temperature detection module 50, an induction module 60 and a heating control module 70, wherein the CPU module 40, the temperature detection module 50, the induction module 60 and the heating control module 70 are respectively and electrically connected with the power supply module 30, and the temperature detection module 50, the induction module 60 and the heating control module 70 are respectively and electrically connected with the CPU module 40; the CPU module 40 is used for data processing; the temperature detection module 50 is used for detecting the ambient temperature of the PDA and feeding back the ambient temperature to the CPU module 40; the sensing module 60 is arranged on the back of the screen 10, the sensing end of the sensing module 60 faces the screen 10, and the sensing module 60 is used for sensing whether the screen 10 is shielded; the heat conductive film 20 is attached to the back of the screen 10, and the heat conductive film 20 is electrically connected to the heating control module 70.
Referring to fig. 2 to 4, in embodiment 1 of the present invention, the sensing module 60 is disposed at the upper left of the screen 10, the heat conducting film 20 is disposed with the through hole 21, and the sensing module 60 is correspondingly disposed at the through hole 21. The sensing module 60 is used for sensing whether the screen 10 is shielded, i.e., whether fog is generated on the screen 10. In other embodiments of the present invention, the position of the sensing module 60 may be set reasonably according to actual situations, which is not limited in the present invention.
Specifically, in embodiment 1 of the present invention, the sensing module 60 includes an infrared transmitter 61 and an infrared receiver 62, where the infrared transmitter 61 is configured to transmit infrared light, and the infrared receiver 62 is configured to receive infrared light; when the infrared transmitter 61 transmits infrared light and the infrared receiver 62 receives the reflected infrared light, it indicates that the screen 10 is blocked by fog; conversely, when the infrared receiver 62 does not receive the infrared light, it indicates that the screen 10 is not blocked.
The CPU module 40 can automatically control the heating control module 70 according to the environmental temperature change and the screen being blocked. The heating control module 70 has a first operation mode in which the heating control module 70 applies a first constant temperature heating current to the heat conductive film 20 and the heat conductive film 20 generates heat at the first constant temperature; in the second operation mode, the heating control module 70 applies a second constant temperature heating current to the heat conductive film 20, and the heat conductive film 20 generates heat at the second constant temperature. Thus, when the PDA enters a low temperature environment, the CPU module 70 may control the heating control module 70 to enter different working modes according to the different sheltered conditions of the screen 10, and heat the screen 10 at different temperatures, thereby avoiding the influence of the fogging of the screen 10 on the working schedule.
In a preferred embodiment of the present invention, the heat conducting film 20 is an ITO (Indium-Tin Oxide) heat conducting film, and the heat conduction is rapid and uniform. The ITO thin film is an n-type semiconductor material, and has high electrical conductivity, high visible light transmittance, high mechanical hardness, and good chemical stability. It is the most commonly used thin film material for transparent electrodes of Liquid Crystal Displays (LCD), Plasma Displays (PDP), electroluminescent displays (EL/OLED), touch screens (TouchPanel), solar cells, and other electronic instruments.
In the preferred embodiment of the present invention, the temperature detecting module 50 is a thermistor, and the resistance value thereof changes with the change of the temperature, and has the characteristics of high sensitivity, wide working range, small volume, good stability, convenient use, etc. The invention utilizes the thermistor to detect the ambient temperature and feeds the ambient temperature back to the CPU module 40 in time, so that the CPU module 40 can automatically control the heating control module 70 according to the change of the ambient temperature.
Referring to fig. 1 to 5, fig. 5 is a flowchart illustrating an automatic defogging method for a PDA screen according to the present invention. The automatic defogging method for the PDA screen comprises the following steps:
the temperature detection module 50 detects the ambient temperature at any moment and feeds the ambient temperature back to the CPU module 40, and the CPU module 40 compares the ambient real-time temperature with a preset temperature threshold to determine whether the ambient temperature is lower than the preset temperature threshold;
when the real-time ambient temperature is greater than the preset temperature threshold, the sensing module 60 and the heating control module 70 do not work;
when the real-time ambient temperature is less than or equal to the preset temperature threshold, the sensing module 60 is turned on, and whether the screen 10 is shielded is detected by using an infrared sensing principle;
(1) if the sensing module 60 does not detect that the screen 10 is blocked, the CPU module 40 controls the heating control module 70 to enter a first operating mode, the heating control module 70 applies a first constant temperature heating current to the heat conducting film 20, and the heat conducting film 20 generates heat at the first constant temperature to perform constant temperature heating on the screen 10; in the heating process, the temperature detection module 50 continuously detects the ambient temperature and feeds the ambient temperature back to the CPU module 40, and when the ambient real-time temperature is greater than the preset temperature threshold, the sensing module 60 and the heating control module 70 stop working;
(2) if the sensing module 60 detects that the screen 10 is blocked for 30 seconds continuously, the CPU module 40 controls the heating control module 70 to enter a second operating mode, the heating control module 70 applies a second constant temperature heating current to the heat conducting film 20, and the heat conducting film 20 heats at the second constant temperature to perform constant temperature heating on the screen 10; in the process, the temperature detection module 50 continuously detects the ambient temperature and feeds the ambient temperature back to the CPU module 40, the sensing module 60 constantly detects whether the screen 10 is shielded and feeds the screen to the CPU module 40, if it is sensed that the screen 10 is not shielded within 30 seconds, the CPU module 40 controls the heating control module 70 to enter a first working mode, the heating control module 70 supplies a first constant temperature heating current to the heat conducting film 20, and the heat conducting film 20 heats at the first constant temperature to perform constant temperature heating on the screen 10; if the real-time ambient temperature is greater than the predetermined temperature threshold, the sensing module 60 and the heating control module 70 stop operating.
The first constant-temperature heating current is smaller than the second constant-temperature heating current, and the first constant-temperature is smaller than the second constant-temperature. Specifically, in embodiment 1 of the present invention, the preset temperature threshold is 0 ℃, the first constant temperature heating current is 0.1A, the second constant temperature heating current is 0.8A, the first constant temperature is 0 ℃, the second constant temperature is 15 ℃, the control precision is high, and the defogging effect is good.
In summary, the present invention provides an automatic defogging system and method for a PDA screen, which uses a temperature detection module to detect an ambient temperature at any time, and automatically heats the screen at a first constant temperature when the ambient temperature is low but the screen is not fogged, thereby preventing the screen from being fogged; when the environmental temperature is low and the screen is fogged, the screen is automatically heated at the second constant temperature, so that the fog is removed, the PDA can normally work when entering a low-temperature environment, the PDA parts are prevented from being in a humid environment for a long time, and the service life of the PDA is prolonged; the automatic demisting system and the method for the PDA screen have the characteristics of automation, intellectualization and energy conservation, do not need manual operation of a user, and can improve the application suitability of the PDA in normal temperature environment and low temperature environment.
The present invention has been described in relation to the above embodiments, which are only exemplary of the implementation of the present invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. Rather, it is intended that all such modifications and variations be included within the spirit and scope of this invention.
Claims (10)
1. An automatic defogging system for a PDA screen is characterized in that: the temperature detection module, the induction module and the heating control module are respectively electrically connected with the power supply module, and the temperature detection module, the induction module and the heating control module are respectively electrically connected with the CPU module; the CPU module is used for processing data; the temperature detection module is used for detecting the ambient temperature of the PDA and feeding back the ambient temperature to the CPU module; the sensing module is arranged on the back of the screen, the sensing end of the sensing module faces the screen, and the sensing module is used for sensing whether the screen is shielded or not; the heat conduction film is attached to the back face of the screen and electrically connected with the heating control module.
2. The automatic defogging system for a PDA screen of claim 1, wherein: the heat conduction film is provided with a through hole, and the sensing module is correspondingly arranged at the through hole.
3. The automatic defogging system for a PDA screen of claim 1, wherein: the sensing module comprises an infrared transmitter and an infrared receiver, the infrared transmitter is used for transmitting infrared rays, and the infrared receiver is used for receiving the infrared rays; when the infrared transmitter transmits infrared light and the infrared receiver receives the reflected infrared light, the screen is shielded.
4. The automatic defogging system for a PDA screen of claim 1, wherein: the heating control module has a first working mode and a second working mode, in the first working mode, the heating control module leads first constant temperature heating current to the heat conduction membrane, and the heat conduction membrane generates heat at the first constant temperature; in the second working mode, the heating control module supplies a second constant temperature heating current to the heat-conducting film, and the heat-conducting film generates heat at a second constant temperature.
5. The automatic defogging system for a PDA screen of any one of claims 1 through 4, wherein: the heat conduction film is an ITO heat conduction film.
6. The automatic defogging system for a PDA screen of any one of claims 1 through 4, wherein: the temperature detection module is a thermistor.
7. An automatic defogging method for a PDA screen is characterized by comprising the following steps: the method comprises the following steps:
the temperature detection module constantly detects the ambient temperature and feeds the ambient temperature back to the CPU module, and the CPU module compares the ambient real-time temperature with a preset temperature threshold value and judges whether the ambient temperature is lower than the preset temperature threshold value or not;
when the real-time ambient temperature is greater than the preset temperature threshold, the induction module and the heating control module do not work;
when the real-time temperature of the environment is less than or equal to a preset temperature threshold value, the sensing module is started, and whether the screen is shielded or not is detected by utilizing an infrared sensing principle; if the induction module does not detect that the screen is shielded, the CPU module controls the heating control module to enter a first working mode, the heating control module conducts first constant-temperature heating current to the heat conducting film, and the heat conducting film heats at a first constant-temperature to perform constant-temperature heating on the screen; if the induction module detects that the screen is blocked continuously for 30 seconds, the CPU module controls the heating control module to enter a second working mode, the heating control module conducts second constant-temperature heating current to the heat conducting film, and the heat conducting film heats at the second constant temperature to conduct constant-temperature heating on the screen.
8. The method for automatically defogging a screen of a PDA according to claim 7, wherein: the preset temperature threshold is 0 ℃.
9. The method for automatically defogging a screen of a PDA according to claim 7, wherein: the first constant-temperature heating current is smaller than the second constant-temperature heating current, and the first constant-temperature is smaller than the second constant-temperature.
10. The method for automatically defogging a screen of a PDA as recited in claim 9, wherein: the first constant-temperature heating current is 0.1A, the second constant-temperature heating current is 0.8A, the first constant-temperature is 0 ℃, and the second constant-temperature is 15 ℃.
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| CN202111636596.0A CN114489246A (en) | 2021-12-29 | 2021-12-29 | Automatic defogging system and method for PDA screen |
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| CN202111636596.0A CN114489246A (en) | 2021-12-29 | 2021-12-29 | Automatic defogging system and method for PDA screen |
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2021
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| CN105554928A (en) * | 2015-12-04 | 2016-05-04 | 上海斐讯数据通信技术有限公司 | Screen defogging method, system and device for mobile terminal |
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