CN111452537B - Display method and device - Google Patents
Display method and device Download PDFInfo
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- CN111452537B CN111452537B CN201910059763.6A CN201910059763A CN111452537B CN 111452537 B CN111452537 B CN 111452537B CN 201910059763 A CN201910059763 A CN 201910059763A CN 111452537 B CN111452537 B CN 111452537B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
- B43L1/00—Repeatedly-usable boards or tablets for writing or drawing
Abstract
The invention provides a display method and a device, comprising the following steps: writing on a surface, the surface generating different intensities of thermal radiation in written portions than in unwritten portions; reading the thermal image caused by different thermal radiation intensity by a thermal imaging device, and further obtaining the information represented by the thermal image. The display method can generate heat radiation difference during writing, so that the thermal infrared imager is used for observation, and ambient light or self luminescence is not needed for display.
Description
Technical Field
The invention relates to the field of display, in particular to a display method, a display device, a writing device and thermal imaging.
Background
Currently, communication between people in the complete absence of light sometimes requires writing to convey information to avoid exposing themselves. Typical display devices are directly viewed by the human eye and must rely on visible light, require self-illumination or rely on illumination. Self-illuminating displays such as liquid crystal screens cannot be used in these applications, while non-self-illuminating displays such as electronic ink or conventional paper pens cannot be seen in the absence of light. Since the near-infrared light can be detected by the silicon-based image sensor, the method of illuminating or displaying by using the near-infrared light also exposes its own target, and thus is not feasible.
Therefore, it is necessary to design a display method and device that does not emit visible light or near infrared light in a dark environment.
Disclosure of Invention
The invention provides a display method which can display information in a dark environment and does not emit visible light or near infrared light by itself.
The invention provides a display method, which comprises the following steps: writing on a surface, the surface generating different intensities of thermal radiation in a written portion than in an unwritten portion; reading the thermal image caused by different thermal radiation intensity by a thermal imaging device, and further obtaining the information represented by the thermal image.
The display method has the advantages that: the thermal radiation difference can be generated during writing, so that the thermal infrared imager is used for observation, and the display is performed without ambient light or self-luminescence.
Further, the surface is higher in heat radiation at the written portions than at the unwritten portions; alternatively, the written portion of the surface radiates less heat than the non-written portion.
Further, after a set time has elapsed since the difference in heat radiation formed between the written portion and the non-written portion of the surface, the difference in heat radiation is eliminated; or the difference in thermal radiation disappears by itself. After the heat radiation difference disappears, the written information is erased.
The invention also provides a display device which is applied to the display method; the display device comprises at least one display surface; when the writing is performed, a difference in heat radiation is formed between a written portion and an unwritten portion of the display surface, and a thermal image having a difference in heat radiation is formed on the display surface.
Preferably, a liquid is left in a written region of the display surface at the time of the writing, and when the liquid is volatilized, a difference in heat radiation occurs between a written portion and an unwritten portion of the display surface.
Preferably, the display surface comprises a porous material and/or a liquid absorbent material such that the liquid is retained on the display surface for a set time.
Preferably, the display surface is heated by the heating device, the liquid is heated and volatilized completely, and the display surface is restored to the same temperature, so that the difference of heat radiation is eliminated.
Preferably, each display unit comprises a positive electrode, a negative electrode and a resistor, when the writing is carried out, the positive electrode and the negative electrode of the written part are conducted, so that the corresponding resistor is heated, and the resistance of the written part and the resistance of the unwritten part have heat radiation difference. For example, the positive and negative electrodes may be brought into electrical communication by a conductive writing instrument, or may be brought into physical contact by being deformed.
Preferably, the resistor is de-energized to eliminate said difference in heat radiation even if the positive and negative electrodes are disconnected.
Preferably, the resistor is located in a thermally insulating material, which may be air or ceramic or the like.
Preferably, the resistor is kept in a conducting state after the positive and negative electrodes are conducted.
Preferably, each display unit includes: the switch SW1, the switch SW2, the optocoupler U1, the optocoupler U2 and the resistor; when writing, the positive electrode SW1 of the part to be written is conducted, the optical coupler device U1 is conducted, and a light emitting diode in the optical coupler device U2 is driven; the pin of the optocoupler U2 is switched on, so that the optocoupler U2 is self-driven; even if the switch SW2 is turned off, the resistor is always in the energized state and generates heat; when the switch SW1 is in short circuit, the balance of the optocoupler U2 is broken, the resistor is powered off, the heat radiation difference is eliminated, and erasing is realized.
Preferably, each display unit includes: a switch SW1, a switch SW2, a comparator U3 and a resistor; when writing, the writing tool enables the switch SW1 to be in short circuit, the positive and negative ends of the comparator U3 have voltage difference, the comparator outputs high level, and the driving resistor continuously heats; even if the switch SW1 is turned off, the resistor is always in the energized state and generates heat; when the switch SW2 is in short circuit, the voltage difference of the positive and negative phase ends of the comparator U3 is 0V, the comparator outputs low level, the resistor is powered off, the heat radiation difference is eliminated, and erasing is realized.
Preferably, each display unit includes: PMOSQP1, triode QP2, switch SW1 and resistor; when writing, the writing is carried out according to the principle that the switch SW1 is short-circuited, the transistor QP2 is conducted, the voltage of the collector of the transistor QP2 is pulled to the bottom, the PMOSQP1 is conducted, the voltage of the base of the transistor QP2 is provided, the transistor QP2 and the PMOSQP1 are always in a conducting state, and therefore the resistor is driven to continuously generate heat; when the switch SW1 is short-circuited again, the base electrode of the triode QP2 discharges to the collector electrode, the triode QP2 becomes a cut-off state, the PMOSQP1 is not electrified, the resistor is powered off, the heat radiation difference is eliminated, and the erasing is realized; the PMOSQP1 is a P-channel metal oxide semiconductor field effect transistor.
The invention also provides a display device applied to the display method; the display device comprises a background radiation source; and a writing layer used for shielding the heat radiation of the background radiation source is arranged above the background radiation source.
Preferably, the writing layer and the background radiation source have a set distance therebetween; when writing, the distance between the written part of the writing layer and the background radiation source is changed, and the difference value between the temperature of the writing layer of the written part and the temperature of the background radiation source is changed; the written part of the writing layer has a difference of heat radiation with the non-written part of the writing layer.
Preferably, the distance between the writing layer and the background radiation source is restored to eliminate the thermal radiation difference.
Preferably, the writing layer is a structure which can be partially erased or coated; a supporting layer which is permeable to heat radiation is arranged between the background radiation source and the writing layer and is used for supporting the writing layer; when writing, the written part of the writing layer is erased or coated, and the heat radiation of a background radiation source of the erased or coated part is exposed or shielded; there is a thermal radiation difference between the background radiation source of the thermal radiation exposed portion and the writing layer of the shielded portion.
Preferably, after erasing or coating the portion of the writing layer, the writing layer is recoated or erased after a set time, and the writing layer recocks or exposes the thermal radiation of the background radiation source to eliminate the thermal radiation difference.
The invention also provides a display device, which is applied to the display method; the display device comprises a background radiation source with a certain temperature; the written portion of the background radiation source surface is coated with a writing layer having a different thermal radiation emissivity than the background radiation source.
Preferably, the difference in thermal radiation emissivity of the background radiation source and the writing layer is greater than 0.2.
Preferably, the background radiation source is heated or cooled.
Preferably, one of the background radiation source and the writing layer is made of metal.
Preferably, the writing layer is wiped off or recoated to eliminate the difference in heat radiation.
The invention also provides a writing device which is applied to the display method; the writing device has a set temperature; the temperature of the writing device is different from the temperature of the surface to be written; during writing, the writing device conducts heat with the written surface to change the temperature of the written part, and the written part and the non-written part have the heat radiation difference; or the heat radiation difference disappears after a certain time.
The invention also provides a thermal imaging device which is applied to the display method; the thermal imaging device reads a thermal image formed by the difference in thermal radiation.
Preferably, the thermal imaging device displays an image against the human eye through the display device.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of an apparatus according to a third embodiment of the present invention;
FIG. 2 is a first circuit diagram of each display unit of the device according to the third embodiment of the present invention;
FIG. 3 is a second circuit diagram of each display unit of the apparatus according to the third embodiment of the present invention;
FIG. 4 is a third circuit diagram of each display unit of the device according to the third embodiment of the present invention
FIG. 5 is a schematic diagram of the arrangement of the positive and negative electrodes in a line in the third embodiment of the present invention;
FIG. 6 is a schematic view of an apparatus according to a fourth embodiment of the present invention;
FIG. 7 is a schematic view of an apparatus according to a fifth embodiment of the present invention;
fig. 8 is a schematic view of a sixth embodiment of the apparatus of the present invention.
The various reference numbers in the figures illustrate:
1. writing means or finger, 2, resistor, 3, electrode, 4, display unit circuit, 5, writing layer, 6, sliding bar, 7, background radiation source, 8, support layer.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions in the embodiments of the present invention will be clearly described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The appearances of the phrases "first," "second," and "third," or the like, in the specification, claims, and figures are not necessarily all referring to the particular order in which they are presented. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to the listed steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The first embodiment,
The invention provides a display method, which comprises the following steps: writing on a surface, wherein a thermal radiation difference is formed between a written part and an unwritten part of the surface, and a thermal image with the thermal radiation difference is formed on the surface; reading the thermal image formed by the thermal radiation difference through a thermal imaging device, and further obtaining the information represented by the thermal image. The display method can generate heat radiation difference during writing, so that the thermal infrared imager is used for observation, and ambient light or self luminescence is not needed for display. The thermal infrared imager provided by the invention is used for imaging by detecting the thermal radiation emitted by an object and is usually used for night vision or temperature field analysis. The thermal image can be viewed by using a head-mounted device directly against the human eye, wherein the light emitted by the microdisplay device is not visible to other people.
The difference in the generated heat radiation has two main directions: one is that the temperature of the written portion of the surface is higher than that of the unwritten portion; the other is that the temperature of the written part of the surface is lower than that of the unwritten part. As long as there is a difference in heat radiation, when writing is performed on the display plane, the written portion and the non-written portion generate a difference in heat radiation, and the written content can be captured by the thermal imaging device.
Further, after a set time has elapsed since the difference in heat radiation formed between the written portion and the non-written portion of the surface, the difference in heat radiation is eliminated; or the difference in thermal radiation disappears by itself. The text generated by this difference in heat radiation needs to exist for a certain time after the text is written on the display plane so that the user has time to see and remember the content. After the user remembers the character content, the temperature of the surface can be reset, the state of the surface is recovered to the same temperature, the original characters are erased, and the next screen writing is carried out.
Example II,
The invention also provides a display device which is applied to the display method; the display device comprises at least one display surface; the display surface has a background temperature; when the display surface is written, the written part and the unwritten part of the display surface form a thermal radiation difference, and a thermal image with the thermal radiation difference is formed on the display surface. The display surface can be the surface of an object, when the writing is carried out, liquid is reserved in a written area of the display surface, the liquid can be water, and when the liquid volatilizes, the heat of a written position is taken away through volatilization, so that the written part and the unwritten part of the display surface have heat radiation difference.
When the display surface is used, a water pen or a hand can be used for dipping water, even a finger (a certain amount of water is generated on the finger due to sweating of a human body) is directly used for writing on the surface of an object, and when the water is volatilized, the heat of a written position is taken away, so that the display surface has a thermal radiation difference between a written part and an unwritten part.
The display device may be a dedicated writing tablet, the surface of which comprises a porous material and/or a liquid absorbing material to retard the rate of evaporation of the liquid so that the liquid remains on the display surface for a set period of time during which the user can see and record the writing. The display surface can be heated by a heating device, after the liquid is heated and volatilized, the display surface is recovered to the same temperature, the heat radiation difference is eliminated, the original characters are erased, and the next screen is written. It is of course also possible to wait for the liquid on the display surface to evaporate naturally.
The display device of the present invention needs to be used in conjunction with a thermal imaging device.
Example III,
As shown in fig. 1, the present invention further provides another display device, which is applied to the display method; the display device comprises at least one display surface; a background temperature is present at the display surface; when the display surface is written, the written part and the unwritten part of the display surface form a thermal radiation difference, and a thermal image with the thermal radiation difference is formed on the display surface.
The display surface comprises an electrode 3 array, the electrode 3 array is composed of a plurality of positive and negative electrodes 3 pairs; each pair of positive and negative electrodes 3 can form a basic hot spot, when writing is carried out, the positive and negative electrodes 3 of the written part are conducted, so that the temperature of the written part is increased, the top end of each electrode 3 is provided with the resistor 2, and when the positive and negative electrodes 3 are conducted, the temperature of the corresponding part through which current flows is obviously increased. The circuit 4 can be designed to make the conducting positive and negative electrodes 3 still in conducting state after the writing tool leaves the display surface. The written part and the non-written part have heat radiation difference, and the positive and negative electrodes 3 continuously provide power supply to generate heat, so that the temperature of the written part can be always kept higher than that of other parts. The display device described in this embodiment may be connected to a power supply, and continuously provides power to the conductive positive and negative electrodes 3, and the positive and negative electrodes 3 are always kept in a conductive state after being conducted. The array of electrodes 3 is located in a thermally insulating material, which may be ceramic or air, etc., so as to slow down the diffusion of heat so that the written portion is clearly distinguished from the non-written portion. After the positive and negative electrodes 3 are conducted for a period of time, when the written content needs to be eliminated, the positive and negative electrodes 3 are controlled to be disconnected, the heat radiation difference is eliminated, the original characters are erased, and the next screen writing is carried out.
As shown in fig. 2, each display unit may include: the switch SW1, the switch SW2, the optocoupler U1, the optocoupler U2 and the resistor 2; when writing, the positive electrode and the negative electrode 3SW1 of the written part are conducted, the optical coupler device U1 is conducted, and a light emitting diode in the optical coupler device U2 is driven; the pin of the optocoupler U2 is switched on, so that the optocoupler U2 is self-driven; even if the switch SW2 is turned off, the resistor 2 is always in the energized state and generates heat; when the switch SW1 is in short circuit, the balance of the optocoupler U2 is broken, the resistor 2 is powered off, the heat radiation difference is eliminated, and erasing is realized.
As shown in fig. 3, each display unit may include: a switch SW1, a switch SW2, a comparator U3 and a resistor 2; when writing, the writing tool enables the switch SW1 to be in short circuit, the positive and negative ends of the comparator U3 have voltage difference, the comparator outputs high level, and the driving resistor 2 continuously heats; even if the switch SW1 is turned off, the resistor 2 is always in the energized state and generates heat; when the switch SW2 is in short circuit, the voltage difference of the positive and negative phase ends of the comparator U3 is 0 volt, the comparator outputs low level, the resistor 2 is powered off, the heat radiation difference is eliminated, and erasing is realized.
As shown in fig. 4, each display unit may include: PMOSQP1, a triode QP2, a switch SW1 and a resistor 2; when writing, according to the short circuit of the switch SW1, the transistor QP2 is conducted, the voltage of the collector 3 of the transistor QP2 is pulled to be bottom, the PMOSQP1 is conducted, the voltage of the base of the transistor QP2 is provided, the transistor QP2 and the PMOSQP1 are always in a conducting state, and therefore the resistor 2 is driven to continuously generate heat; when the switch SW1 is short-circuited again, the base electrode of the triode QP2 discharges to the collector 3, the triode QP2 becomes a cut-off state, the PMOSQP1 is not electrified, the resistor 2 is powered off, the heat radiation difference is eliminated, and the erasing is realized; the PMOSQP1 is a P-channel metal oxide semiconductor field effect transistor.
As shown in fig. 5, it is also possible to arrange the positive and negative electrodes 3 in respective lines, the lines of the positive electrodes 3 and the lines of the negative electrodes 3 forming an angle, and the planes of the positive and negative electrodes 3 directly forming a distance. When the writing tool is pressed, the positive electrode 3 and the negative electrode 3 at the pressed part are conducted, heat is generated when current flows through the resistor 2, the temperature of the pressed part changes, and a heat radiation difference is generated by distinguishing the temperature of the part which is not pressed from the temperature of the part which is not pressed.
The writing instrument of the present invention may be a special purpose tool or a hand.
Of course, the display unit may also only comprise positive and negative electrodes and resistors, the resistors are heated when the positive and negative electrodes are turned on, the temperature is gradually restored when the positive and negative electrodes are turned off, and the content is eliminated when the temperature difference naturally disappears. The resistance may be the resistance of the electrode itself.
Example four,
As shown in fig. 6, the present invention further provides another display device, which is applied to the display method; the display device includes a substrate having a set temperature; the substrate surface is provided with a writing layer 5 having a temperature different from the substrate temperature. A set distance is reserved between the writing layer 5 and the substrate, and the writing layer 5 can be made of a flexible material; when writing, a part of the writing layer 5 is in contact with the substrate, and the temperature of the writing layer 5 at the part to be written is close to the temperature of the substrate; the written portion of the writing layer 5 has a difference in heat radiation from the rest of the writing layer 5. After the written writing layer 5 part contacts the substrate for a set time, when the written content needs to be eliminated, the distance between the writing layer 5 and the substrate is recovered, the thermal radiation difference is eliminated, the original characters are erased, and the next screen writing is carried out. A sliding bar 6 may be used to restore the distance between the writing layer 5 and the substrate.
When the writing tool is pressed, the writing layer 5 is pressed to contact with the substrate having a certain temperature, and the temperature of the pressed portion changes, thereby generating a difference in heat radiation from the temperature of the non-pressed portion.
Similarly, the writing layer 5 is at a set distance from the background radiation source 7, e.g. close together; when writing, the distance between the written part of the writing layer 5 and the background radiation source 7 is increased, and the temperature of the written part of the writing layer 5 is different from the temperature of the background radiation source 7; the written portion of the writing layer 5 is different in heat radiation from the non-written portion of the writing layer 5.
Example V,
As shown in fig. 7, the present invention further provides another display device, which is applied to the display method; the display device includes a substrate having a set temperature; the substrate surface is provided with a writing layer 5 having a temperature different from the substrate temperature. The writing layer 5 is a structure which can be partially erased; the writing layer 5 may be placed on a support layer 8 which is permeable to heat radiation. The writing layer 5 may be a powdery or grease-like heat insulating material. During writing, the written part of the writing layer 5 is erased, and the heat radiation of the substrate below the erased part of the writing layer 5 is exposed or exposed through the support layer 8 which is permeable to heat radiation; there is a difference in heat radiation between the substrate of the heat radiation exposed portion and the writing layer 5 of the non-erased portion. After the partial writing layer 5 is erased, when the written content needs to be erased, the writing layer 5 is coated again, the writing layer 5 shields the heat radiation of the substrate again, the heat radiation difference is eliminated, the original characters are erased, and the next screen writing is carried out.
When the writing instrument is pressed, the writing layer 5 in powder or grease form is erased and the thermal radiation of the substrate with a certain temperature is exposed or is exposed through the support layer 8 through which the thermal radiation is transmitted, which differs from the temperature of the unerased position by a difference in thermal radiation.
In this case, the substrate is used to provide a background for heat radiation, and the background radiation source may be a human hand or other human body part, a vehicle or other heating body, an ambient environment, a ground, a sky, or a near place or a far place.
For example, the background radiation source may be a human hand or other body part, or a vehicle or other heating body, or the surrounding environment, or the ground, or the sky, or may be near or far, and may have a temperature higher or lower than that of the writing material, and a writing layer is coated on the heat radiation transparent support layer 8, and a part of the writing layer is erased, so that a heat radiation difference is generated between the un-erased part and the background radiation source, and the written content can be captured by the thermal imaging device.
Example six,
As shown in fig. 8, the present invention further provides a display device, which is applied to the display method; the display device includes a substrate having a set temperature; the writing layer 5 with the temperature different from that of the substrate is arranged on the surface of the substrate, and the writing layer 5 is of a coatable structure; the writing layer 5 may be a powder or liquid material. The writing layer 5 is applied partly on the substrate, or on a support layer 8 transparent to the heat radiation, during writing. The heat radiation of the substrate is blocked or exposed at the coated portion and the uncoated portion, generating a heat radiation difference. The thermal radiation difference is generated during writing, so that the thermal infrared imager is used for observation, and the display is performed without ambient light or self-luminescence.
After the heat radiation of the substrate is partially shielded by the writing layer 5, the writing layer 5 can be erased, the heat radiation difference is eliminated, the original characters are erased, and the next screen writing is carried out.
The substrate in the fourth, fifth and sixth embodiments may be an electric heating plate connected to a power supply, or may be a refrigeration plate. The background radiation source 7 may be heated or cooled. The difference in heat radiation is eliminated by restoring the initial state of the writing layer 5.
In this case, the substrate is used for providing a background for heat radiation, and may be a human hand or other human body part, a vehicle or other heating element, an ambient environment, a ground, a sky, a near place, or a far place.
For example, the background radiation source may be a human hand or other body part, or a vehicle or other heating body, or the surrounding environment, or the ground, or the sky, or may be near or far, and the writing layer is partially coated on the heat radiation transparent support layer 8, so that the writing content can be captured by the thermal imaging device by generating a heat radiation difference between the written part and the background radiation source.
Examples seven,
The invention also provides a writing device 1 applied to the display method; the writing device 1 has a set temperature; the temperature of the writing device 1 is different from the temperature of the surface to be written; during writing, the writing device 1 conducts heat with the surface to be written, changes the temperature of the part to be written, and has the difference in the heat radiation between the part to be written and the part not to be written. The writing device 1 can be an electric heating pen or an electric refrigerating pen, and is used for writing on a plane, so that the temperature of a written part is different from that of an unwritten part, and thermal radiation difference can be generated during writing, so that the thermal infrared imager is used for observation, and ambient light or self luminescence is not needed for displaying.
Example eight,
The invention also provides a display device applied to the display method; the display device includes a substrate having a set temperature; the temperature of the substrate is different from the ambient temperature, and the substrate can be heated or cooled; the writing layer is directly positioned on the substrate; the writing layer material has different thermal radiation emissivity from the substrate, so that the thermal radiation intensity is different even if the temperature of the writing layer material is the same as that of the substrate; preferably, the difference between the emissivity of the two is greater than 0.2; preferably, one of the substrate material and the writing layer material is a metal. The application of writing material to the exposed substrate during writing, or the partial wiping off of a previously applied layer of writing material, results in a different intensity of thermal radiation for the written portion than for the unwritten portion.
Erasing the writing layer material to re-expose the substrate, or completely covering the substrate with the writing layer material can achieve the purpose of erasing the written content.
Examples nine,
The invention also provides a thermal imaging device which is applied to the display method; the thermal imaging device reads a thermal image formed by the difference in thermal radiation.
The thermal imaging device can be a head-wearing thermal imager, a handheld thermal imager or a thermal imaging module connected with the mobile terminal, as long as the thermal imaging device can obtain a written thermal image according to the surface thermal radiation difference.
The thermal imaging detection method provided by the invention can be used for detecting the infrared specific waveband signal of the thermal radiation of an object, converting the signal into an image and a graph which can be distinguished by human vision, and further calculating the temperature value. Infrared thermography techniques have been used to overcome visual barriers by humans, whereby one can see the temperature distribution on the surface of an object. If the surface temperature of the object exceeds absolute zero, electromagnetic waves can be radiated, the radiation intensity and the wavelength distribution characteristic of the electromagnetic waves are changed along with the temperature change, the electromagnetic waves with the wavelength between 0.75 mu m and 1000 mu m are called infrared rays, and the visible light of human vision is between 0.4 mu m and 0.75 mu m. Wherein the part with the wavelength of 0.78-2.0 microns is called near infrared, and the part with the wavelength of 2.0-1000 microns is called thermal infrared. Infrared thermographic inspection is based on measuring the infrared radiation energy of the object surface. The light refers to the electromagnetic wave with the wavelength less than 2 microns and capable of being detected by human eyes or general photoelectric detectors, and the heat radiation refers to the electromagnetic wave with the wavelength of 7-15 microns and capable of being detected by a thermal imaging instrument.
The emissivity (emissivity/emissivity) of the invention refers to the ratio of the radiation capability of an object to the radiation capability of a black body at the same temperature, and is called the emissivity, also called emissivity, specific emissivity of the object. The emissivity of an actual object is related to the material composition and surface condition of the object, including the surface temperature, surface roughness, and the presence of surface oxidation, surface contamination, or coatings.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments. In the several embodiments provided in the present application, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one type of division of logical functions, and there may be other divisions when actually implementing, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not implemented. Each functional unit in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The invention is not limited to the embodiments discussed above. The foregoing description of the specific embodiments is intended to describe and explain the principles of the invention. Obvious modifications or alterations based on the teachings of the present invention should also be considered as falling within the scope of the present invention. The foregoing detailed description is provided to disclose the best mode of practicing the invention, and also to enable a person skilled in the art to utilize the invention in various embodiments and with various alternatives for carrying out the invention.
Claims (13)
1. A method of displaying, the method comprising:
writing on a surface, wherein the written part and the unwritten part of the surface generate heat radiation with different intensities, the written part is conducted through a positive electrode and a negative electrode of the surface, so that the corresponding resistance is heated, and the resistance of the written part and the resistance of the unwritten part have heat radiation difference; wherein the surface is a display surface;
reading thermal images caused by different thermal radiation intensities by a thermal imaging device so as to obtain information represented by the thermal images;
the surface is higher in heat radiation at the written part than at the unwritten part;
alternatively, the written portion of the surface radiates less heat than the non-written portion.
2. The display method according to claim 1, wherein the difference in heat radiation is eliminated after a set time has elapsed since the difference in heat radiation is formed between the written portion and the non-written portion of the surface;
or the difference in thermal radiation disappears by itself.
3. The display method of claim 1, wherein the display surface comprises an electrode array consisting of a number of positive and negative electrode pairs.
4. A display device characterized by being applied to the display method according to any one of claims 1 to 3;
the display device comprises at least one display surface;
when writing, the written part and the unwritten part of the display surface form a heat radiation difference, and a thermal image with the heat radiation difference is formed on the display surface;
each display unit comprises a positive electrode, a negative electrode and a resistor, when the writing is carried out, the positive electrode and the negative electrode of the written part are conducted, so that the corresponding resistor is heated, and the heat radiation difference exists between the written part and the unwritten part in the written part.
5. A display device as claimed in claim 4, characterised in that the resistors are de-energized, eliminating the difference in heat radiation.
6. A display device as claimed in claim 4, characterised in that the resistor is located in a thermally insulating material.
7. The display device according to claim 6, wherein the heat insulating material is air or ceramic.
8. The display device according to claim 4, wherein the resistance is kept in an on state after the positive and negative electrodes are turned on.
9. The display device according to claim 4, wherein each display unit comprises: the switch SW1, the switch SW2, the optocoupler U1, the optocoupler U2 and the resistor;
when writing, the positive electrode SW1 of the written part is conducted, the optical coupler U1 is conducted, and a light emitting diode in the optical coupler U2 is driven; the pin of the optocoupler U2 is switched on, so that the optocoupler U2 is self-driven;
even if the switch SW2 is turned off, the resistor is always in the energized state and generates heat;
when the switch SW1 is in short circuit, the balance of the optocoupler U2 is broken, the resistor is powered off, the heat radiation difference is eliminated, and erasing is realized.
10. The display device according to claim 4, wherein each display unit comprises: a switch SW1, a switch SW2, a comparator U3 and a resistor;
when writing, the writing tool enables the switch SW1 to be in short circuit, the positive and negative ends of the comparator U3 have voltage difference, the comparator outputs high level, and the driving resistor continuously heats;
even if the switch SW1 is turned off, the resistor is always in the energized state and generates heat;
when the switch SW2 is in short circuit, the voltage difference of the positive and negative phase ends of the comparator U3 is 0 volt, the comparator outputs low level, the resistor is powered off, the heat radiation difference is eliminated, and erasing is realized.
11. The display device according to claim 4, wherein each display unit comprises: PMOSQP1, triode QP2, switch SW1 and resistor;
when writing, the writing is carried out according to the principle that the switch SW1 is short-circuited, the transistor QP2 is conducted, the voltage of the collector of the transistor QP2 is pulled to the bottom, the PMOSQP1 is conducted, the voltage of the base of the transistor QP2 is provided, the transistor QP2 and the PMOSQP1 are always in a conducting state, and therefore the resistor is driven to continuously generate heat;
when the switch SW1 is short-circuited again, the base electrode of the triode QP2 discharges to the collector electrode, the triode QP2 is turned into a cut-off state, the PMOSQP1 is not electrified, the resistor is powered off, the heat radiation difference is eliminated, and erasing is realized;
the PMOSQP1 is a P-channel metal oxide semiconductor field effect transistor.
12. A thermal imaging apparatus characterized by being applied to the display method according to any one of claims 1 to 3;
the thermal imaging device reads a thermal image formed by the difference in thermal radiation.
13. The thermal imaging device of claim 12, wherein said thermal imaging device displays an image against the human eye via a display device.
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| SE515437C2 (en) * | 1997-10-22 | 2001-08-06 | Lars Andersson | Figure Painting |
| CN1131472C (en) * | 2001-01-12 | 2003-12-17 | 王剑 | Hand Writing input device for computer and its high-speed hand writing input method |
| CN101963871A (en) * | 2010-10-21 | 2011-02-02 | 广州视源电子科技有限公司 | Optical touch control system based on infrared spotlight recognition and realization method thereof |
| CN203444459U (en) * | 2013-07-16 | 2014-02-19 | 上海科世达-华阳汽车电器有限公司 | Novel multi-point resistive touch screen, detection circuit and switching device |
| EP3108330B1 (en) * | 2014-02-17 | 2021-10-20 | Apple Inc. | Method and device for detecting a touch between a first object and a second object |
| CN104139654B (en) * | 2014-07-17 | 2016-06-15 | 苏州芸芮懿电子科技有限公司 | Handwriting eraser |
| CN205403610U (en) * | 2016-03-04 | 2016-07-27 | 中国人民解放军66345部队 | Thermal imaging target |
| CN205728280U (en) * | 2016-04-28 | 2016-11-30 | 上海融军科技有限公司 | A kind of helmet-type IR night vision apparatus |
| JP6086461B1 (en) * | 2016-09-09 | 2017-03-01 | 株式会社ネットアプリ | Touch panel and touch panel system |
| KR102576541B1 (en) * | 2016-10-13 | 2023-09-11 | 엘지디스플레이 주식회사 | Touch display device and method for driving the same, driving circuit, data driving circuit, and gate driving circuit |
| CN106872848A (en) * | 2017-02-17 | 2017-06-20 | 安徽国家铜铅锌及制品质量监督检验中心 | A kind of printed circuit board (PCB) thermal imaging testing method and device |
| CN106919293B (en) * | 2017-03-10 | 2019-12-31 | 北京京东方显示技术有限公司 | Handwriting screen assembly and display device |
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| CN107274823B (en) * | 2017-08-04 | 2020-05-12 | 京东方科技集团股份有限公司 | Pixel circuit, handwriting display panel and handwriting display system |
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