JPS59119655A - Display unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to display devices or commonly referred to as VDu's. Typically, such a location will be associated with a television tube for displaying information derived from a processor or computer device.

BACKGROUND OF THE INVENTION It has been found that operators who sit in front of display devices are particularly susceptible to skin diseases around the face and neck, likely due to exposure to an active VDU.

Early attention was focused on the possibility of radiation poisoning and the like, but careful testing and measurements have largely reduced these possibilities.

According to the volunteer's own experiments, an alternative potential reason for irritation appears to arise from dust particles accelerated by the electrostatic field generated by the screen, and the skin irritation is probably due to dust particles impinging on the skin. It is considered to be a thing.

The object of the present invention is to overcome this problem and provide indication II, which is less likely to cause dermatitis.

SUMMARY OF THE INVENTION According to the present invention, there is provided a display device 5- having a conductive material placed in front of a cathode ray tube screen of the display device, the conductive material being connected to charge dissipation means and connected to the screen. are arranged correspondingly,
The electrical charge appearing on the screen is thereby guided to its dissipation means.

EXAMPLE It is known that by dissipating the electrical charge that forms on a CRT screen, the risk of dermatitis on the aforementioned areas of the operator is reduced.

The charge can be dissipated by an electrical connection between the conductive material and an actual or effective earth.

Alternatively, the corona amm pole may be oriented away from where the operator is normally located;
The electrically conductive material can be connected thereto and dissipated using needle discharge electrodes according to well-known discharge theory. Here, the needle discharge WAll is placed near VDu and a separate conductive screen is required between the discharge device and the operator to prevent any air flow between the discharge tip and the operator.

6- In one embodiment, the conductive material may be applied directly to the surface of the cathode mw of the VDU. The material is film-A<,
One suitable film is Natlonal Adh.
T I-121, manufactured by eslavas
TL125. There are also products sold under trade names such as TI-126 and TI-126. It should be recognized that these specific references are not intended to limit the invention to the use of these particular materials, but are specified by way of example only.

These materials are water-based polymers, and when dried, their conductivity is believed to be unaffected by ambient humidity. Therefore, those materials are inherently conductive materials, and if the film is formed of such materials or has such properties, the conductivity of the film will depend on the location of the VDU. It is convenient if it is not affected by the humidity of the environment.

Electrical connections to such films are made by forming conductive areas where electrical leads electrically connect with the remainder of the film to dissipate any charge that forms on the surface of the VDLJ. The coated area is surrounded by an electrically conductive frame which is established; or which is connected via suitable electrical conductors for charge dissipation purposes.

In another preferred embodiment of the invention, the electrically conductive material forms part of an independent self-supporting mask, which mask is placed in front of the cathode ray tube on or near the border area of the tube. , or spread across a suitable support frame in front of the cathode ray tube, or additionally or attached to a frame that usually encloses a glass CRT screen. In each case, electrical connections need to be made to the mask, provided with conductive terminals such as metal eyelets or solder tags,
Electrical connections can be made to the terminal.

The electrically conductive material may be in the form of a fine grid of lines, which may be parallel to each other or intersect at right angles, for example forming an orthogonal array. Typically a grid of lines with a pitch of 20 lines per inch,
Each line may have a width of approximately 0.010 inches. If the line is opaque and you use it, you can use CRT.
By appropriate selection of pitch and line width, the loss of light can be reduced to non-problematic wetting.

This most-mentioned embodiment has the advantage over a planar conductive surface, in that each wire additionally acts as a discharge corona wire, and in practice less conductive material may be required. Of course, the charge can be dissipated by a suitable electrical connection to ground or by a discharge electrode as described above.

The grid can also be formed as a mesh, which is mounted on a transparent carrier sheet member, preferably a flexible sheet.

Typical dimensions of the metal mesh needed to achieve the desired optical properties are 100 micron holes and 0.05 micron holes.
11111 diameter wire. The types of metals that can be used commercially to form this fine mesh are limited by the ability to draw the metal to the fine diameter required; commonly used metals include brass and stainless steel. It is steel.

For the V D IJ shield of this invention, some blackening process is required to make the mesh as anti-glare as possible and improve its optical properties. As a possibility, the brass mesh can be electroplated, for example with black chrome. The problem with this is that the actual chrome (or other plating) deposit tends to bond the wire meshes together at the points where each wire intersects. This means that the mesh no longer has high flexibility and will not easily conform to the three-dimensional shape of the DU screen. However, to prevent moiré patterns caused by the interaction between the shadow of the mesh and the mesh itself,
It is important that the mesh is in contact with the screen. This problem was solved by forming the mesh using a male mosquito press toy after electroplating, thereby giving the mesh a permanent dish-like shape that roughly matched the shape of the VD10-U screen. can.

An oxidation process is a method of blackening metal mesh without losing the flexibility of the mesh, which is applied to stainless steel mesh (which is also more durable than brass mesh). This process (for example l 100
is a non-electrolytic oxidation process in which stainless steel mesh is immersed in a bath of acid and additives. To further improve the anti-glare properties of the mesh, it is necessary to roughen the inherent polished surface of the wire: this can be done by chemical etching or electrolytic reaction, as well as paints, rubbers, adhesives or the like. types of ions commonly used to etch metal surfaces prior to bonding with
This can also be done through bombardment. Importantly, it has been found that wires with uniformly matte surfaces can be obtained by plasting with ceramic, aluminum oxide, or iron sand. Sand of size smaller than the mesh hole size should be used, typically 50-75 microns. These roughening processes are preferably performed before the blackening process.

The mask can also be made from a conductive braided mesh, such as dark or black nylon. This material is each R13
The navy blue surface has an inherent luster and an overall amount of light reflection. In a preferred embodiment, the fine mesh is formed from a metallic material that is chemically treated or electroplated to give a black matte surface to the entire constituent metal of the mesh, making the mask totally reflective. reduce

In order to reduce static levels as effectively as possible, it is desirable that the conductive mesh be mounted in contact with the surface of the cathode ray tube.

The mask can be fixed to the \fDU screen using a transparent adhesive material used to adhere the mask to glass, disposed at least in the corner areas of the mask.

A transparent double-sided adhesive tape is possible as the transparent adhesive material.

Alternatively, the transparent sheet member can preferably be formed from a type of plastic material that adheres to glass without adhesive.

To attach the screen to the screen, one corner containing the ground wire is first secured.

The diagonal corners are then fixed, removing any slack. The remaining two diagonal corners are then stretched and fixed simultaneously to remove wrinkles.

It has been found that when adhesive strips are used along the entire edge of the mask, it is very difficult to align and secure them. If a small piece of adhesive material is used at each corner, some misalignment will be tolerated and the mask can be modified later.

As an alternative embodiment, it is also possible to apply such a grid of lines or a conductive film directly to the glass of the cathode ray tube of the display device, with suitable electrical connections if necessary for lightning dissipation. A connection is provided.

The transparent sheet member used may be formed of a material that has filtering properties that reduce ultraviolet or other radiation emitted by the cathode ray tube during normal use of the tube. In this way, the display device is made acceptable even to operators with particularly sensitive skin.

According to a further preferred feature of the invention, the improved mask is formed with large dimensions so that the C
It is used after being cut to a size that fits the RT screen.

According to another aspect of the invention, a kit for attaching a mask to a polar ray tube screen comprises a mask as described above, the overall dimensions of which are the same as the largest screen for which the kit is intended. and a pattern, which pattern has a mark printed on it and can be applied to the cathode i-tube to which the mask is to be attached, and the two adjacent edges are The stencil material 181 is aligned with the edges of the opening of the frame containing the tube screen (e.g., one bottom edge 14- and one side edge), and the pattern material 181 is stretched over the CRT screen before being aligned with the remaining two edges of the screen. Two edges are measured on the pattern and marked thereon by means of a sharp blade or needle to provide a cutting line that allows the pattern to be cut to exactly the dimensions of the cathode ray tube screen. The paper pattern can then be used to draw the perimeter of the mask, or directly so that the mask can be cut to the correct size.

The mask is convenient for packing and shooting, as it can be rolled up with a pattern and placed in a cardboard bag, along with a ground wire and a small piece of adhesive if needed.

The finished VDU shield is supplied to fit the divine dimensions, i.e., as a large rectangle that the user cuts to fit the specific VDU screen, but alternatively, it comes pre-cut. The user can also provide the size or model of their VDU and the mesh is cut to fit that size, typically by mold cutting by the vDU shield manufacturer.

In use, the VDLJ shield should be connected by a conductive lead to a convenient ground point, thus dissipating or radiating static electricity from the VDU screen. A single wire could be used for this purpose, but it may not be very aesthetically pleasing as a retrofit device attached to the outside of the VDU.

Another feature of the invention involves the use of a metal strip that is itself adhesive. Typically, this is aluminum 50 microns thick and approximately 10 mm wide, with an adhesive backing, such as acrylic, which is protected before use with a silicone paper-lined strip. . Such materials include Sellotape, 3M, and Barrler
It is available from various companies such as Prior to shield installation, this material is attached at one end to one convenient edge or corner of the vDU screen, guided to the corner of the screen frame, around the cabinet, and glued to the back of the vDU. and a convenient ground point on its back, e.g. chassis, coax.

or glued to a power ground connection, etc. This gives the appearance of a tidy ground connection and is preferable to Wire A7.

For home use, an easily removable plastic shield would be preferred, especially if the television set is used in conjunction with a microcomputer. In this case, the television can be used for full viewing without a shield, or can be used with a shield when using a computer. This means that the shield must be mounted on the screen and then removed many times, so the shield material must be durable and must have an easy installation method. Must be. A suitable material is a grade of transparent PvC known as ``self-glue'' or ``window adhesive.''

It is typically about 0.010 inches thick and is commonly used for example in automobiles. ~Used as a sticker on a window as a landmark or sign, such as a paper holder to hold a driver's license fixed to the glass. The material is)-1o
J is made by several manufacturers including escht company Kuwana.

An equivalent of the gold layer mesh of E) is introduced onto the transparent PvC surface in the form of a printed black conductive grid. Typical grid dimensions are 50 micron wide lines with 100 micron hole dimensions, such as Coates B r.

s (l industrial Finishes
) company or A chesOn Industry Co., Ltd. IJ”A
A black matte conductive ink of the type described can be used. It contains graphite or nickel powder to provide the necessary conductivity.

Although there are limited printing methods that can provide the required grid fineness, one such suitable printing method is known as d, p, or direct printing, according to which flat metal The plate has a grid of etched grooves corresponding to the desired grid pattern. Conductive ink is filled into the grooves and excess ink is wiped from the surface of the plate. The plate is then brought into pressure contact with the surface of the PVC sheet and is often heated along with the plate. The ink is transferred from the groove to the PvC sheet and subsequently dried. Additionally, the printed PvC may be further coated over the printed grid with a transparent varnish that serves to retain the ink.
It may also be matte or semi-matte to provide a surface of the sheet with low reflectivity. The invention also provides a cathode ray tube for use in a display device or the like, the display screen including an optical filter over a portion or all of the display area, which prevents radiation from the screen during use. UV and other harmful radiation are filtered, and the filter is combined with a grid of conductive elements or a conductive film, thereby reducing the electric field generated on the surface of the screen during use by grounding or discharging electrodes or such Can be dissipated by electrical connection to objects.

From the foregoing, it is clear that when a grid of lines is used, the lines should be formed so long as the spacing between the lines is sufficient to allow light to pass from the display and does not interfere with reading the information on the display. The material to be coated does not have to be transparent.

According to a particularly preferred embodiment of the invention, the film of transparent conductive material or the grid of conductive lines may be formed by metallizing the surface of the CRT or a sheet of glass or plastic material placed in front of the CRT. It is possible. The metallization can be accomplished using a vacuum deposition process or the like.

It has been found that when a color television screen is viewed at close range, such as when a color television monitor is used as a computer terminal, its individual primary colors are easily distinguished. Naturally, this is undesirable and can be eliminated by using a blurring screen between the observer and the phosphorescent surface that produces the primary colors upon impact of the electron beam.

The blurring screen can be integrally formed with the glass screen forming the end of the cathode ray tube, or it can be a separate sheet member placed in front of a conventional cathode ray tube screen.

One convenient form of a blurring screen includes a sheet of plastic or glass, one side of which is slightly "frosted" by having a number of depressions or pyramidal ridges formed thereon. More pleasing colors are obtained through the use of this type of blurring screen, which is either integrally formed with the monitor screen or placed in front of the screen.

According to another feature of the invention, the protective screen for reducing both glare and electrostatic fields arising from the cathode tube is made of nylon or similar plastic thread coated with a suitable conductive material. It may be formed from a loosely woven mesh, with connection means provided for dissipating electrostatic fields and attachment means provided for attaching the mesh to the front surface of the screen. There is.

If the threads from which the mesh is woven are themselves of a dark color, and the conductive film on top of the threads is also dark, the screen will have the necessary properties to dissipate the electric field in front of the CRT. It also has the properties necessary to reduce glare from the screen and also to reduce reflections from the screen of light incident on the screen.

In a preferred embodiment of this aspect of the invention, the nylon threads are woven into an open mesh and treated with a conductive resin or metallized to make the mesh conductive.

The loosely woven conductive mesh is preferably supported by a frame, which frame corresponds to the opening surrounding the cathode ray tube to be observed, and which frame corresponds to its cathode 1119! It is used by being fixed to a housing or other member surrounding the screen.

In one form, a frame bordering and supporting the conductive mesh includes a PE body in one or more areas around the back of the frame, and the frame is attached to the housing. It remains in place in the housing after being applied and gently pressed into position.

In such embodiments, the crimp area is preferably protected by means of a strip of removable material until the area is ready to be attached to the television monitor.

If a television monitor is placed in front of a television monitor with lines or dots that are necessarily printed in straight lines and closely spaced, a moiré-fringing effect will be obtained when viewing that screen, which is not suitable for normal use. This is completely unacceptable.

In accordance with yet another aspect of the invention, the warp or weft threads of the parallel or convergent mesh forming the grid of lines or dotted lines are arranged in a cathode ray tube raster.
) at an angle in the range 10 degrees to 80 rX with respect to the line scan direction of the scanning spot.

One preferred slope of the line, dotted line, or warp or weft, is 30 degrees to the line scan direction.

When a mask is made by printing conductive ink onto a transparent sheet by an intaglio process, the plate is first created by etching fine grooves arranged orthogonally onto the surface of the plate. . The plate is then applied with ink to fill the grooves, its surface is wiped just so that the ink remains in the grooves, and a transparent sheet (e.g. PVC) is pressed against the plate to print. be done.

This mask can then be mounted onto a paper backing sheet.

Claims (16)

[Claims] (1) A display device, wherein the cathode IIs of the display device
a conductive material placed on the surface of the screen, said conductive material being disposed correspondingly to said screen and connected to charge dissipation means, whereby the electrical charge appearing on said screen is dissipated by said conductive material; A display device characterized in that it is guided to a dissipation means. (2) The display device according to claim 1, wherein the conductive material is formed in contact with the surface of the screen. (3) The conductive material is formed by itself or applied to a transparent substrate, and the substrate is placed in front of the screen. display device. (4) A mask for a cathode ray tube screen of a display device, wherein the mask has conductive properties and does not significantly impair the visibility of the screen when placed in front of the screen. A mask characterized by being almost transparent. 5. A mask according to claim 4, characterized in that the mask includes electrical connection means through which the conductive mask is connected to means for dissipating electrical charge. . (6) A special F! characterized in that the conductive property is provided by a conductive mesh! FM requirement range 4th term or 511th! Mask on la. (7) The mask according to claim 6, wherein the mesh is formed of a metal wire. (8) The mask according to claim 7, wherein the wire has a matte finish surface. (9) The mask according to claim 8, wherein the metal is stainless steel and has a matte black finish by chemical treatment. (10) The mask according to any one of claims 6 to 9, wherein the mesh is supported by a transparent sheet member. 11. A mask according to claim 4 or claim 5, characterized in that the conductive properties are provided by conductive ink printed on the transparent sheet member. (12) The mask according to claim 11, wherein the ink is printed on the sheet member by an intaglio process. (13) The mask according to any one of claims 10 to 12, wherein the sheet member has radiation filtering properties. (14) Claim 1, wherein the transparent sheet member is a flexible plastic material and adheres to glass without the use of any separate adhesive.
A mask described in any one of Items 0 to 13. (15) A mask according to claim 13, characterized in that the ink is printed in the form of a grid of interconnected lines. (16) A kit for applying a mask to a screen of a display device, the kit as claimed in claim r8
comprising a mask according to any of clauses 4 to 15, the overall dimensions of said mask being adapted to the largest screen dimensions, and further said kit comprising a mask adapted to a particular screen comprising: A kit characterized in that it includes a paper pattern having marked outlines of typical screen dimensions to enable it to be marked for cutting.