JP2011081414A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device that has a display panel of sufficient strength against an impact from a display surface side, has high contrast, and has a low cost. <P>SOLUTION: The display device 1 includes a flat panel type display means 2 for performing display by light emission operation in space formed by facing glass substrates 210 and 220 to each other. A glass substrate 290 on the side for performing display, of the glass substrates, has a laminated glass structure where inorganic glass plates 220 and 240 are stuck to each other via an adhesive layer 230 of an organic polymer material. The adhesive layer 230 includes the material of a melting point temperature lower than that of the adhesive for sticking the glass substrates to each other. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a display device that displays a television image or the like using display means such as a flat panel display.

  In display devices such as television receivers, with the progress of display means, flat panel (planar panel type) display means such as a liquid crystal display (hereinafter abbreviated as “LCD”) and a plasma display panel (Plasma). Thin panels using Display Panel (hereinafter abbreviated as “PDP”) are being introduced. In addition, display monitors using flat panels are becoming larger and, for example, large-sized panels of type 50 (diagonal 1270 mm, etc.) have come to be used.

  As the set becomes larger, the strength of the panel has become a problem. Patent Documents 1 to 3 below are related arts related to reinforcing the strength of a panel of a display device.

JP 11-295702 A JP 2004-181975 A Japanese Patent Laid-Open No. 2002-341781

  In the prior art described in Patent Document 1, the display means is a plasma addressed liquid crystal system, and laminated glass is used between the plasma portion and the liquid crystal portion to increase the strength during assembly. However, in this prior art, the reinforcement with the laminated glass is the reinforcement of the inner part of the panel, and the glass part forming the outer side of the display device is not reinforced. For this reason, it has not been sufficiently considered in the past that sufficient strength may not be obtained against destruction by external force.

  In the prior art described in Patent Document 2, a sheet having an impact absorbing function is attached to a flat panel display means to obtain a panel that is strong against an impact from an external force. However, in this prior art, since the strength of the sheet material itself is not high, it has not been sufficiently recognized that sufficient strength may not be obtained depending on the use environment. Further, the sheet has a two-stage structure, and the manufacturing process of the sheet is complicated, which may be disadvantageous in terms of cost.

  In the prior art described in Patent Document 3, a separate plate material such as glass is provided on the display surface side with respect to the flat panel display means so that an external force is not directly applied to the flat panel display means body. Thus, the strength of the entire apparatus is maintained. In this conventional technique, a plate material separate from the panel is required, and the thickness of the entire apparatus including the distance between the panel and the plate material is increased, resulting in an increase in size. In addition, since it is a separate body, the interface has been optically increased, stray light may be generated due to reflection at the interface, and the contrast of the display screen may be lowered.

  The present invention has been made in view of the above-mentioned problems, and its object is to provide a display device having a high contrast and a low cost while having a display panel with sufficient strength against an impact from the display surface side, and its manufacture. It is to provide a method.

  The present invention is characterized by the structures described in the claims. More specifically, it has a flat panel display means having a front glass and a rear glass, and performing display by light emission operation or light modulation operation in a space formed by facing the front glass and the rear glass. The display device includes a front grill having translucency as an exterior case located on the front side of the display device, and the front grill is larger than the front glass of the flat panel display means, and the front grill and the A front glass is combined, and the front grill is thicker than the front glass.

  According to the present invention, since the substrate glass portion is made of laminated glass, there is an effect that the impact resistance strength of the entire device can be increased and a display device having sufficient strength for the use environment can be provided. Further, since the glass is directly pasted, an unnecessary reflecting surface is not formed, so that a reduction in contrast can be prevented. Furthermore, since a simple glass plate is attached, there is an effect that is advantageous over the shock absorbing sheet method in terms of cost. Furthermore, in the unlikely event of breakage, the broken glass is held by an adhesive layer of laminated glass, and there is an effect that safety can be maintained without glass fragments being scattered.

  As described above, there is an effect that it is possible to provide a display device that is excellent in impact resistance, optically high in contrast, and low in cost.

1 is a perspective view illustrating an appearance of a display device according to Embodiment 1. FIG. Sectional drawing of the panel part of the display means in Example 1. FIG. The flowchart which shows the laminated glass preparation procedure of the panel part in Example 1. FIG. Sectional drawing of the panel part of the display apparatus of Example 2. FIG. Sectional drawing of the panel part of the display apparatus of Example 3. FIG. FIG. 10 is a perspective view illustrating an appearance of a display device according to a third embodiment.

  The best mode for carrying out the present invention will be described.

  Embodiments of a display device and a manufacturing method thereof according to the present invention will be described below with reference to the drawings. Note that components having common functions are denoted by the same reference symbols throughout the drawings, and repeated descriptions of those described once are omitted to avoid complication.

  Example 1 will be described. 1 to 5 are explanatory diagrams of this embodiment. Description will be made sequentially from FIG. FIG. 1 is a perspective view showing a display device according to the first embodiment. In FIG. 1, a monitor unit 1 is a display device main body portion, and is placed in a state of being supported by a display device support base 3. An image is displayed on the display unit 2 of the monitor unit 1 based on an external broadcast radio wave or video signal taken in from the signal input terminal 110. In the present embodiment, the display unit 2 of the monitor unit 1 will be described using an example using flat panel display means such as a PDP.

  FIG. 2 shows a cross section of the panel unit 200 that forms the main part of the display unit 2 of the display device 1 according to the first embodiment shown in FIG. A plasma cell unit 201 that performs a display operation is placed in an airtight container surrounded by a rear glass 210 and a front glass 220 that are arranged to face each other at a predetermined distance (for example, 100 μm) and a frame glass 270 that seals the peripheral edge thereof. Discharge gas (not shown) is sealed, and cells serving as pixels are formed in a matrix. A plurality of striped pairs of display electrodes 260 (actually two electrodes but shown as one for convenience) are formed on the inner surface of the front glass 220, and orthogonal to the display electrodes 260 on the inner surface of the rear glass 210. A plurality of striped address electrodes (not shown) are formed in the direction. The internal space between the rear glass 210 and the front glass 220 is partitioned by a plurality of barrier ribs 250 along each address electrode (not shown) and divided into a plurality of discharge spaces 255, and each address in each discharge space 255 is also divided. A phosphor 280 is applied over the partition 250 so as to cover an electrode (not shown). Then, ultraviolet light is generated by plasma discharge in the discharge space 255 at the intersection of the display electrode 260 to which the drive voltage is applied and the address electrode (not shown), and the phosphor 280 is excited to generate visible light, so that display is performed. Is called. In this sense, the discharge space area at the intersection of the display electrode 260 and the address electrode corresponds to a pixel and is generally called a cell (discharge cell). Light from the plasma cell unit 201 is emitted from the front glass 220 side. The display electrode 260 is actually orthogonal to the extending direction of the partition wall 250 (that is, orthogonal to the address electrode), but in FIG.

  A cover glass 240 is provided on the light emission side of the front glass 220 via a light-transmitting adhesive layer 230 made of a polymer material, and an image displayed on the plasma cell unit 201 is observed from the cover glass 240 side. Can do. An arrow 120 indicates the observation direction.

  The cover glass 240 and the front glass 220 are each made of an inorganic glass plate, and are laminated through an adhesive layer 230 to form a laminated glass, which constitutes a front glass portion 290. The front glass portion 290 is a composite reinforced material that combines two functions of the tensile strength of the adhesive layer and the compressive strength of the glass layer due to the laminated glass structure. For this reason, it is possible to obtain strength several times to ten times or more, particularly impact resistance, as compared with a display panel having a normal glass structure.

  As an adhesive used for the adhesive layer 230, for example, an epoxy adhesive for attaching an optical member or an acrylic adhesive is used. These refractive indexes are substantially the same as those of glass, and the reflection at the adhesive layer is at a level that causes no problem in practical use, and there is no possibility of causing a decrease in contrast.

  In the case of a conventional plasma panel, there is a firing step in which the glass portion is heated and bonded between the back glass and the front glass in the manufacturing process, and the glass portion is exposed to a firing temperature at this time, for example, 400 ° C. For this reason, even if it is a case where normal tempered glass (made by increasing the strength by reducing the crystal by heat treatment on the surface) is used for the front glass, tempering is performed in the above baking step, The crystal structure may grow and the strength may be greatly reduced, for example, to a half or a third. However, in this embodiment, the front glass portion 290 composed of the front glass 220 and the cover glass 240 has a laminated glass structure by retrofitting the cover glass 240. Strength higher than tempered glass, especially impact resistance can be obtained.

  As a procedure for creating the laminated glass portion, the plasma cell portion 201 is created, and then the front glass 220 and the cover glass 240 are bonded via the adhesive layer 230. For this reason, the melting point temperature of the adhesive layer 230 made of an organic polymer material is relatively low, for example, 180 ° C., and the combination is such that the plasma cell portion 201 is melted when subjected to a baking temperature, for example, 400 ° C. However, since it adheres after the plasma cell part 201 is created, it can be created without any problem.

  In addition, the surface of the cover glass 240 is provided with an antireflection coating (generally referred to as “AR coating”) or a coating that reduces light. In this case, since the base material of the cover glass 240 is an inorganic glass plate, the surface hardness can be made relatively high compared to a conventional method of attaching an AR coating film, and scratches are caused in handling. The effect of being difficult is obtained.

  FIG. 3 is a flowchart showing a manufacturing procedure of the panel portion of the first embodiment shown in FIGS. 1 and 2. In FIG. 3, when processing is started in step (hereinafter abbreviated as “S”) 410, first, S 420, which is a PDP portion creation step of the plasma cell portion 201, is performed, and then a cover glass matching step S 430 is performed, The glass 220 and the cover glass 240 are brought into contact with each other with the adhesive layer 230 interposed therebetween and placed at a position where they are bonded. Next, a heat bonding treatment step S440 is performed, and the adhesive layer 230 is heated and melted to a melting point of the adhesive layer, for example, 180 ° C. or higher, for example, 200 ° C., and the cover glass 240 is bonded to the front glass 220. Finally, a cooling treatment step S450 is performed to complete the front glass portion 290 having a laminated glass structure (S460). By adopting such a manufacturing process, it is possible to create a display means having a laminated glass structure having an adhesive layer having a melting point lower than the firing temperature at the time of manufacturing the plasma cell portion.

Since the laminated glass structure described above is simply a structure in which the cover glass 240 is attached to the front glass 220, the manufacturing process is simpler than the case where a sheet having an impact absorbing function is attached to the front glass, which is advantageous in terms of cost. In addition, it is advantageous in terms of strength. In addition, in the unlikely event of breakage, the broken glass is held by an adhesive layer of laminated glass, and there is an effect that glass fragments are not scattered and safety can be maintained.

  A second embodiment will be described. FIG. 4 shows a cross section of the panel unit 202 which forms the main part of the display device of the second embodiment. In this embodiment, the principle of the display means will be described by using a liquid crystal. The liquid crystal display unit 203 that performs a display operation is formed of a liquid crystal layer 271 filled in a space formed by the back glass 210, the front glass 220, and the frame glass 270. Each pixel is formed by an electric field generated from each electrode 261,262. The liquid crystal in the liquid crystal layer 271 changes its polarization direction by an electric field applied between a pair of electrodes 261 and 262 forming individual pixels, and operates as individual pixels. Display as. In addition, although the electrode 261 and the electrode 262 are actually orthogonal, in FIG. 4, it has shown as the same direction for convenience. An arrow 120 indicates the observation direction. The image displayed from the cover glass 240 side is observed.

  The cover glass 240 and the front glass 220 are laminated through an adhesive layer 230 to form a laminated glass, and constitute a front glass portion 290. The front glass portion 290 is a composite reinforced material that combines two functions of the tensile strength of the adhesive layer and the compressive strength of the glass layer due to the laminated glass structure. For this reason, it is possible to obtain strength several times to ten times or more, particularly impact resistance, as compared with a display panel having a normal glass structure.

  A third embodiment will be described. FIG. 5 shows a cross section of a panel portion that is a main part of the third embodiment. In the present embodiment, a plurality of cold cathode electron-emitting devices that do not require heating (hereinafter referred to as “electron source”) are arranged in a matrix on the back glass and emitted from the electron source. A flat panel display means that excites a phosphor formed on a front glass disposed opposite to the rear glass with an electron beam and uses visible light generated by the phosphor is used. There are various types of cold cathode electron sources such as field emission type (for example, Spindt type), surface conduction type and hot electron type (for example, MIM type). Hereinafter, a general term for display means using these cold cathode electron sources is referred to as FED.

  In the FED display unit 500 that performs a display operation, an FED cell unit 501 is bonded to a transparent front grill 530 that also serves as a part of an exterior case of the entire display device. The front glass 520 and the transparent front grill 530 of the FED cell portion 501 are laminated through a light-transmitting adhesive layer 540 to form a laminated glass, and the front glass portion 502 is configured.

  The FED cell portion 501 that performs the display operation is surrounded by a rear glass 510 and a front glass 520 that are arranged to face each other at a predetermined distance (for example, 0.5 mm to 3 mm) and a frame glass 550 that seals the peripheral edge thereof. In an airtight container (space 580), an electron source 560 serving as a pixel is formed in a matrix on the back glass 520, and a phosphor 570 is formed on the front substrate. Since the space 580 is vacuum-tight, a plurality of spacers 561 are provided between the front glass 520 and the rear glass 510 in order to protect the FED cell portion 501 from atmospheric pressure. Then, the phosphor 570 is excited by an electron beam emitted from an electron source 560 that is a pixel to emit light, thereby performing display.

  The front glass portion 502 functions as a laminated glass by the adhesive layer 540 provided between the front grill 530 and the front glass 520. The material of the front grill 530 is a transparent polymer material, and is made of, for example, polycarbonate. At this time, when the thickness of the front grille 530 is set to be larger than the thickness of the front glass, such as the thickness of the adhesion surface of the front grill 530 is 3 mm and the thickness of the front glass 520 is 2.8 mm, for example, With respect to the impact from the front surface (in the direction of arrow 120), the occurrence of distortion on the front glass 520 sandwiching the adhesive layer 540 can be suppressed. That is, by using a laminated glass structure, the front glass portion 502 is a composite reinforced material that combines two functions of the tensile strength of the adhesive layer and the compression strength of the front grille. For this reason, it is possible to obtain strength several times to ten times or more, particularly impact resistance, as compared with a display panel having a normal glass structure.

  FIG. 6 is a perspective view showing an appearance of the display device according to the third embodiment described with reference to FIG. As shown in FIG. 6, the front grill 530 functions as an exterior case, and has a role as a strength member as an exterior case of the entire apparatus by fixing a back cover (not shown) by, for example, screws. ing. In addition, the entire apparatus is constituted by the transparent member, and there is an effect that an excellent design can be realized.

  In the above description of the embodiment, three types of display means, PDP, liquid crystal, and FED, have been described as display means. However, other methods such as EL (Electro Luminescence) have similar effects. Needless to say.

  In the description of the examples, as an example of the cover glass of the laminated glass, the example of the inorganic glass plate and the polycarbonate material has been described. However, the same applies even when other materials, for example, polymer resin materials such as acrylic and styrene are used. Needless to say, it is effective. In addition to the side of the observation surface of the inorganic glass plate to which the cover glass is laminated, it is also possible to have the opposite side of the observation surface, and the thickness of the cover glass is the same as the thickness of the inorganic glass plate to be laminated. Or it can be thicker or thinner.

DESCRIPTION OF SYMBOLS 1 Display apparatus, 2 Display part, 200 Panel part, 201 Plasma cell part, 210 Back glass, 220 Front glass, 270 Frame glass, 230 Adhesive layer, 240 Cover glass

Claims (8)

In a display device comprising a flat panel type display means having a front glass and a back glass, and performing display by light emission operation or light modulation operation in a space formed by facing the front glass and the back glass,
A front grille having translucency as an exterior case located on the front side of the display device;
The front grill is larger than the front glass of the flat panel type display means, and combines the front grill and the front glass;
A display device, wherein the front grill is thicker than the front glass.   The display device according to claim 1, wherein the front grille and the front glass are coupled to each other by a translucent adhesive.   3. The display device according to claim 1, wherein the front grill is made of a transparent polymer material.   The display device according to claim 3, wherein the transparent polymer material constituting the front grill includes polycarbonate, styrene, and acrylic.   5. The display device according to claim 1, wherein a portion other than a portion coupled to the front glass of the front grille has a curvature.   6. The display device according to claim 1, wherein a back cover as an exterior case on the back side of the display device is fixed to the front grill. In a display device comprising a flat panel type display means having a front glass and a back glass, and performing display by light emission operation or light modulation operation in a space formed by facing the front glass and the back glass,
As an exterior case of the display device, a translucent front grille and a back cover are provided,
The front grill is larger than the front glass of the flat panel display and is coupled to the front glass of the flat panel display, and the back cover is fixed.
A display device, wherein the front grill is thicker than the front glass.   The display device according to claim 7, wherein the front grill and the front glass are bonded to each other with a light-transmitting adhesive to form a laminated glass structure.

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