JPH1165460A - Image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep a picture display section in a clean state over a long time and to realize a good display by providing a transparent photocatalyst on the outer surface of the picture display section. SOLUTION: A picture display device main body 11 utilizing an electron beam is constituted of a cathode-ray tube(CRT) 12 being a display section and a control circuit section 13 controlling it. A film of a transparent photocatalyst 14 is formed on an outer surface of the CRT 12. Thereby, organic matter or the like adsorbed on the surface of the CRT display section 12 can be dissolved and removed. As dust or the like is suppressed to deposite on the surface when the organic matter does not exist on the surface, the CRT display section 12 can be kept in a clean state over a long time and a good display can be realized. When titanium is used as the photocatalyst 14, the dissolution and the removal of the organic matter or the like can be performed efficiently. For example, the film of the photocatalyst 14 having superior transparency can be easily formed on the surface of the CRT display section 12 by a sol-gel method or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device attached to information equipment and the like and an image display device such as a TV.
The present invention relates to an image display device that can effectively prevent a stain on an image display unit.

[0002]

2. Description of the Related Art An image display unit of an image display device such as an information device or a TV is usually made of glass. However,
Since glass is an insulator, charges easily accumulate on the surface due to the effects of electrons and ions. In the case of a display method using an electron beam or the like, charges are more likely to accumulate on the surface due to the influence of the electron beam. When such charge accumulation occurs, it becomes easier to attract dust, organic molecules, and the like contained in the surrounding air, and stains are generated on the image display unit. Therefore, there is a problem that cleaning must be performed frequently in order to maintain the function as the image display device.

[0003] In order to reduce the accumulation of electric charges, a method of providing a mesh filter on the front surface and grounding the electric charges has been performed. However, this method does not sufficiently reduce the electric charge accumulation, and furthermore, has a problem. There is a disadvantage that the brightness of the display device is significantly reduced.

When a conventional indoor air purifier is operated in parallel with such an image display device, it is possible to purify the air in the entire room to some extent. Since the surface itself has an action of attracting a substance causing dirt, it has been difficult to keep the image display device surface clean for a long time.

[0005]

As described above, in the conventional method, it was difficult to prevent the display surface of the image display device from being stained and to keep the image display portion clean. SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and provides an image display device that maintains an image display unit in a clean state for a long time and realizes good display.

[0006]

According to the present invention, there is provided an image display apparatus for displaying an image on an image display unit using an electron beam, wherein a transparent photocatalyst is provided on an outer surface of the image display unit. An image display device characterized by comprising:

According to the present invention, there is provided an image display apparatus for displaying an image on an image display unit using a liquid crystal, wherein a transparent photocatalyst is provided on an outer surface of the image display unit. Is provided.

Since the image display device of the present invention has a transparent photocatalyst on the outer surface of the image display unit, it absorbs the ultraviolet light from a fluorescent lamp or the like stored in the room and accumulates electric charges on the surface. Organic substances and the like thus obtained can be decomposed and removed, and formation of stains on the surface of the image display device can be suppressed. If there is no organic substance on the surface, the adhesion of dust and the like to the surface can be suppressed, so that the display portion surface can be kept clean for a long time, and the object of the present invention is achieved.

Further, if the image display device of the present invention is used,
Although a certain period of time is required, it is also possible to reduce organic substances and the like contained in indoor air. Further, this reduction effect is exhibited even when the image display device is not used. However, the effect is smaller as compared with the case where the image display device is used. Needless to say, if this image display device is installed in parallel with a normal air purifier, the effect will be higher.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The image display device according to the present invention refers to a display device attached to an information device or the like, or an image display device such as a TV.

The outer surface of the image display section in the present invention is made of a transparent material, for example, glass.

[0012] The photocatalyst in the present invention absorbs light,
It refers to a catalyst that has the function of utilizing the energy to promote the progress of a chemical reaction. The photocatalyst exerts its function even by external light, but more remarkably exerts its function by receiving light for display when the image display device is used.

In the present invention, the photocatalyst is required to be transparent because it is provided in the image display section of the image display device. Here, "transparent" means transparent so as not to impair the function of the image display device.

As such a photocatalyst, for example, Ti
O ₂ , PbS, ZnS, WO ₃ , Fe ₂ O ₃ , ZrO ₂ , C
dSe and the like. Two or more of these can be used in combination. Of the above examples, titanium oxide is particularly preferred. In addition to excellent chemical resistance, heat resistance, and safety,
This is because the catalyst efficiency is high and a film with high transparency is easily formed.

The image display device of the present invention has a form in which the outer surface of the image display section has the film containing the photocatalyst, and a transparent plate in which the outer surface of the image display section has the film containing the photocatalyst is adhered. It is preferable to use a configuration in which With such a configuration, the photocatalyst can be provided on the outer surface of the image display unit by a simple process. In addition, it is preferable that the said transparent plate is a glass plate, for example. The thickness of the film containing the photocatalyst is preferably 0.1 μm or more and 10 μm or less. When the thickness is 0.1 μm or more, good uniformity of the film thickness can be maintained. The upper limit of the film thickness is not particularly limited.
It is sufficient that the film thickness is not more than m. Further, the film containing the photocatalyst is a film containing titanium oxide,
Preferably, the film is formed by a gel method. This is because the effect of preventing contamination is high and the control of the film thickness is easy. When the film thickness is small, it can be formed by a sputtering method.

FIG. 1 shows an example of the image display device of the present invention. An image display apparatus main body 11 using an electron beam includes a cathode ray tube 12 as a display unit and a control circuit unit 13 for controlling the cathode ray tube. On the outer surface of the cathode ray tube 12, a film of a transparent photocatalyst 14 is formed.

FIG. 2 is a diagram showing an example of an image display device using a liquid crystal. The image display device main body 21 includes a display portion of a liquid crystal 24 sandwiched between glass plates 22 and 23 and a control circuit 25 for controlling the display portion. A transparent photocatalyst 26 film is formed on the outer surface of the outer glass 22 of the display unit.

The above-mentioned film of the photocatalyst 26 is not formed directly on the glass of the display portion, but a method of adhering the glass formed on the surface of the photocatalyst film to the surface of the display portion can be adopted.

In the present invention, in order to increase the quantum efficiency of the photocatalyst, it is effective to attach metal particles such as platinum on the surface of the film containing the photocatalyst. The metal particles have a small particle size of about several nm so as not to impair the transparency of the surface of the image display unit, and can be attached by an evaporation method, a sputtering method, or the like.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the image display device according to the present invention will be described in more detail with reference to embodiments. (Example 1) An example in which the image display device 11 using an electron beam is applied to a display monitor of a personal computer will be described below. A transparent titanium oxide film of about 1 μm was formed as a photocatalyst on the outer surface of the display of the cathode ray tube 12 constituting the display monitor by a sol-gel method. That is, it was formed by adding an alcohol solution of titanium tetraisopropoxide to pure water, hydrolyzing with nitric acid, forming a titania sol, applying the sol to the surface, and then performing a heat treatment at a temperature of about 500 ° C.

The image display device having such a configuration is installed in a closed space (about 1.5 m square), and can be operated from outside by a cable. A fluorescent lamp was installed above the image display device, and light was applied to the display surface. After that, 10 ppm was added to the closed space containing normal indoor air.
Of acetaldehyde and smoke for two or three cigarettes. After introducing them, the state of the enclosed space was observed, and the inside air was analyzed by GC-MS (gas chromatography mass spectrometry). As a result, after one hour, almost no acetaldehyde or cigarette smoke was detected. No stain was observed on the surface of the display unit.
Even after performing the above operation at a frequency of 5 times / day for one week continuously, almost no stain was recognized on the surface of the image display device. On the other hand, a small amount of dirt due to tobacco was visually confirmed on the wall of the closed space.

As a comparative example, an image display device having no photocatalyst on its surface was placed in the above-mentioned closed space, and acetaldehyde and cigarette smoke were introduced in the same manner as described above. As a result, acetaldehyde hardly decreases,
Smoke from tobacco smoke was observed on the surface of the image display device.

(Embodiment 2) Image display device 2 using liquid crystal
An example in which 1 is applied to a liquid crystal TV will be described below. A transparent titanium oxide film having a thickness of about 1 μm was formed as a photocatalyst by a sol-gel method on the outer surface of the glass plate 22 positioned on the outer side of the glass plates sandwiching the liquid crystal. That is, the titanium oxide was formed by adding an alcohol solution of titanium tetraisopropoxide to pure water, hydrolyzing with nitric acid, forming a titania sol, applying it to the surface, and then performing a heat treatment at a temperature of about 500 ° C.

The image display device having the above-described configuration is installed in a closed space (about 1.5 m square), and can be operated from outside by a cable. An ultraviolet lamp was installed above the image display device, and light was emitted to the display surface. After that, place in a closed space containing normal room air.
Acetaldehyde at a concentration of ppm and smoke for one or two cigarettes were charged and sealed. After introducing them, the state of the enclosed space was observed, and the internal air was analyzed by GC-MS (gas chromatograph mass spectrometry). As a result, acetaldehyde and cigarette smoke were hardly detected after 2 hours. . No stain was observed on the surface of the display unit. Even after performing the above operation for 5 consecutive days at a frequency of 1 week, almost no stain was observed on the surface of the image display device. On the other hand, a small amount of dirt due to tobacco was visually confirmed on the wall of the closed space.

As a comparative example, an image display device without a photocatalyst attached to the surface was placed in the above-mentioned closed space, and acetaldehyde and cigarette smoke were introduced in the same manner as described above. As a result, acetaldehyde hardly decreases,
Dirt, which was considered to be caused by tobacco smoke, was observed on the surface of the image display device.

(Embodiment 3) Image display device 2 using liquid crystal
An example in which 1 is applied to a liquid crystal monitor will be described below. In the present embodiment, a pair of glass plates 22 and
Separately from Example 3, a glass plate of about 100 μm was prepared, and titanium oxide was formed on the surface thereof in the same manner as in Example 1. This glass plate was brought into close contact with the front surface of the glass plate 22 of the liquid crystal display unit to produce an image display unit.

An image display apparatus having the above-described structure and a commercially available air purifier using ions and adsorbents were installed in a closed space (about 1.5 m square) so that they could be externally operated by a cable. A fluorescent lamp was installed above the image display device, and light was applied to the display surface. afterwards,
Acetaldehyde at a concentration of 10 ppm and smoke for two or three cigarettes were sealed in a closed space containing ordinary room air. After introducing them, the state of the enclosed space was observed and the inside air was analyzed. As a result, after one hour, almost no acetaldehyde or cigarette smoke was detected.
No stain was observed on the surface of the display unit. Even after performing the above operation at a frequency of 5 times / day for one week continuously, almost no stain was recognized on the surface of the image display device. In this case, almost no dirt was observed on the walls of the closed space.

As a comparative example, an image display device without a photocatalyst attached to the surface and the same air purifier as above were placed in the above-mentioned closed space, and acetaldehyde and cigarette smoke were introduced in the same manner as described above. As a result, acetaldehyde was hardly observed, and dirt due to cigarette smoke was not observed on the wall or the like as much as described in the comparative example in Example 2. However, dirt was found on the surface of the image display device. Adherence was observed.

[0029]

Since the image display device of the present invention has a transparent photocatalyst on the outer surface of the image display section, organic substances and the like adsorbed on the surface of the image display section can be decomposed and removed. If there is no organic substance on the surface, the adhesion of dust and the like to the surface can be suppressed, so that the image display section can be maintained in a clean state for a long time, and good display can be realized.

When titanium is used as a photocatalyst, decomposition and removal of organic substances and the like can be performed efficiently, and a photocatalyst film having excellent transparency can be easily formed on the surface of an image display portion by, for example, a sol-gel method. can do.

Further, in the image display device of the present invention, a structure having a film containing a photocatalyst on the outer surface of the image display portion of the image display portion, or a film containing the photocatalyst on the outer surface of the image display portion of the image display portion is provided. By using a structure in which the glass is closely adhered, a photocatalyst can be provided on the outer surface of the image display unit by a simple process.

[Brief description of the drawings]

FIG. 1 is a view schematically showing a structure of an image display device using an electron beam according to the present invention.

FIG. 2 is a view schematically showing a structure of an image display device using a liquid crystal according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Image display apparatus main body 12 CRT display part 13 Control circuit part 14 Photocatalyst 21 Image display apparatus main body 22, 23 Glass plate 24 Liquid crystal 25 Control circuit part 26 Photocatalyst

Claims (9)

[Claims] 1. An image display device for displaying an image on an image display unit using an electron beam, wherein a transparent photocatalyst is provided on an outer surface of the image display unit. 2. An image display device for displaying an image on an image display unit using a liquid crystal, wherein a transparent photocatalyst is provided on an outer surface of the image display unit. 3. The photocatalyst is titanium oxide.
Or the image display device according to 2. 4. The image display device according to claim 1, wherein the image display section is made of glass. 5. The image display device according to claim 1, further comprising a film containing the photocatalyst on an outer surface of the image display unit. 6. The image display device according to claim 1, wherein a transparent plate having a film containing the photocatalyst on the surface is closely attached to an outer surface of the image display portion. 7. The image display device according to claim 6, wherein the transparent plate is a glass plate. 8. The thickness of the film containing the photocatalyst is set to 0.
The image display device according to claim 5, wherein the thickness is 1 μm or more and 10 μm or less. 9. The image display device according to claim 5, wherein the film containing the photocatalyst is a film containing titanium oxide, and is a film formed by a sol-gel method.