JP5125417B2 - Protection plate integrated display panel - Google Patents

Description

  The present invention relates to a protective plate-integrated display panel in which a protective plate for protecting an observation surface of the display element is integrally disposed on the observation side of a display element that displays an image.

Conventionally, as a protection plate integrated type display panel, a display element and an observation surface protection plate arranged on the observation side are joined via a frame-shaped spacer, and a gap between the display element and the protection plate is formed. There is one in which a viscous liquid is filled in a region surrounded by the spacer (see Patent Document 1).
Utility Model Registration No. 2529118

  However, the conventional protective plate-integrated display panel does not have sufficient bonding strength between the display element and the observation surface protective plate, and the viscous liquid is applied to the gap between the display element and the protective plate. Manufacture is difficult because it must be sealed to prevent leakage.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a protective plate integrated display panel that simplifies the joint structure between a display element and an observation surface protective plate and can be easily manufactured.

The protection plate integrated type display panel according to claim 1 of the present invention,
A pair of substrates on the opposite side and an observation side bonded via a sealing material, and a liquid crystal layer is sealed in a region surrounded by the sealing material in a gap between the pair of substrates; A pair of polarizing plates on the outer surface and the opposite side are arranged, and a display element for displaying an image,
The display element has an area covering the observation side surface, and a convex portion having a predetermined height surrounding a region corresponding to the screen area of the display element is formed on the surface facing the display element. On the observation side of the element, the projection is placed in contact with the observation side surface of the polarizing plate on the observation side of the display element so as to overlap the outer peripheral edge of the polarizing plate on the observation side. The board,
An elastic filling layer made of a polymer of a polymer material filled in a region surrounded by the convex portion of the gap between the display element and the protective plate;
It is characterized by providing.

Invention according to claim 2, in the protective plate-integrated display panel according to claim 1, wherein the convex portion is formed in a frame shape that surrounds the area corresponding to the screen area of the display device, at least A missing portion that connects the space surrounded by the convex portion and the outside of the convex portion is provided in part.

According to a third aspect of the present invention, in the protection plate integrated display panel according to the first or second aspect, the filling layer is a polymer of a polymer material having both ultraviolet-polymerizable and thermal-polymerizable characteristics. It is formed by these.
According to a fourth aspect of the present invention, in the protection plate integrated display panel according to any one of the first to third aspects, an outer peripheral portion of a surface of the observation surface protection plate facing the liquid crystal display element is provided. A light-shielding film is formed over the entire area outside the screen area so as to cover the convex portion.

  According to the protection plate integrated display panel of the present invention, the joint structure between the display element and the observation surface protection plate can be simplified and manufactured easily.

  1 to 3 show an embodiment of the present invention. FIG. 1 is a side view of a protective plate integrated display panel, and FIG. 2 is an enlarged sectional view of one end of the protective plate integrated display panel.

  As shown in FIGS. 1 and 2, the protection plate integrated display panel has an area covering the display element 1 for displaying an image and a surface on the observation side of the display element 1, and faces the display element 1. A convex portion 9 having a predetermined height surrounding a region 8a (see FIG. 3) corresponding to the screen area of the display element 1 is integrally formed on the surface, and the convex portion 9 is formed on the observation side of the display element 1. A transparent observation surface protection plate 8 arranged with the portion 9 in contact with the observation side surface of the display element 1 and the convex portion 9 in the gap between the display element 1 and the protection plate 8 And a transparent elastic filling layer 12 made of a polymer of resin filled in the region.

  The display element 1 is, for example, a liquid crystal display element. The display element 1 is opposed to each other with a predetermined gap, and is paired with a transparent side on the opposite side and an observation side joined via a frame-shaped sealing material 4 surrounding the screen area. The substrates 2 and 3, the liquid crystal layer 5 enclosed in the region surrounded by the sealing material 4 in the gap between the substrates 2 and 3, and the observation side disposed on the outer surfaces of the pair of substrates 2 and 3, respectively. And a pair of polarizing plates 6 and 7 on the opposite side.

  The liquid crystal display element 1 is an active matrix liquid crystal display element in which, for example, a TFT (thin film transistor) is used as an active element. Although omitted in the drawing, the liquid crystal display element 1 is formed on the inner surface of one substrate, for example, the substrate 3 opposite to the observation side. A plurality of transparent pixel electrodes arranged in a matrix in the row direction and the column direction, a plurality of TFTs arranged corresponding to these pixel electrodes and connected to the corresponding pixel electrodes, and each row A plurality of scanning lines for supplying gate signals to the TFTs of the TFTs and a plurality of signal lines for supplying data signals to the TFTs of each column are provided, and the plurality of scanning lines are provided on the inner surface of the other substrate, for example, the substrate 2 on the observation side. A single-film transparent counter electrode facing the pixel electrode array region is provided.

  Although not shown in the drawing, the inner surface of the observation-side substrate 2 has red, green, and blue corresponding to a plurality of pixels each having a region in which the plurality of pixel electrodes and the counter electrode face each other. These three color filters are provided, and the counter electrode is formed on the color filter. An alignment film is provided on the inner surfaces of the pair of substrates 2 and 3 so as to cover the electrodes, and the liquid crystal molecules of the liquid crystal layer 5 are interposed between the pair of substrates 2 and 3 by the alignment film. It is oriented in the defined orientation state.

  The liquid crystal display element 1 displays an image by controlling transmission of light emitted from a surface light source (not shown) disposed on the opposite side to the observation side by applying a voltage between the electrodes of the plurality of pixels. To do.

  The observation surface protection plate 8 is formed in a rectangular plate shape having an outer peripheral portion projecting around the liquid crystal display element 1, and an acrylic resin or the like in which the convex portion 9 is integrally formed on one surface. It consists of a molded product.

  FIG. 3 is a plan view of the protective plate 8 as seen from the convex portion forming surface side. The convex portion 9 has a region 8a corresponding to the screen area of the liquid crystal display element 1 (hereinafter referred to as a screen area corresponding region) 8a. It is formed in a surrounding rectangular frame shape, and at least a part thereof, for example, four corners, is provided with a missing portion 10 that allows the space surrounded by the convex portion 9 to communicate with the outside of the convex portion 9.

  Furthermore, the outer peripheral portion of the surface of the protective plate 8 facing the liquid crystal display element 1 covers the convex portion 9 over the entire area outside the screen area corresponding region 8a (the region indicated by broken line hatching in FIG. 3). Thus, a light-shielding film 11 made of a light-shielding paint printing film or a plating or vapor deposition film of a metal such as chromium is formed.

  The protective plate 8 has the surface on which the projections 9 are formed facing the liquid crystal display element 1 on the observation side of the liquid crystal display element 1, and the projections 9 are on the observation side of the liquid crystal display element 1. (The outer surface of the viewing-side polarizing plate 6), the gap defined by the convex portion 9 (convex) is formed between the liquid crystal display element 1 and the screen area corresponding region 8a of the protective plate 8. The same gap as the height of the portion 9 is provided.

  In addition, the elastic filling layer 12 filled in the region surrounded by the projections 9 in the gap between the liquid crystal display element 1 and the protective plate 8 has both ultraviolet-polymerizable and thermal-polymerizable characteristics. It is formed of a transparent resin made of a polymer of a polymer material.

  High molecular weight materials with both UV-polymerizable properties and heat-polymerizable properties include acrylic monomers such as acrylates and methacrylates, or alicyclic epoxy resins such as acrylic oligomers that are low polymers of one or both of acrylates and methacrylates. It is obtained by adding a curing initiator made of an organic peroxide such as a sulfonium salt.

  This polymer material has a viscosity in an unpolymerized state of 1500 to 10000 mPa · s (millipascal secant), preferably 3000 to 5000 mPa · s, and an E-code hardness after ultraviolet polymerization and thermal polymerization of E4 to E13, It is preferable that the shrinkage rate by E7 to E10, ultraviolet polymerization and thermal polymerization is 0.9 to 2.0%, preferably 0.97 to 1.64%.

  This protective plate-integrated display panel has both UV-polymerizable and thermal-polymerizable properties near the center (near the center of the screen area corresponding region 8a) on the surface of the protective plate 8 on which the projections 9 are formed. A filling material made of a transparent polymer material is supplied by a dispenser or the like, and the liquid crystal display element 1 is disposed thereon with the observation side surface facing the protective plate 8, and these are overlapped. The light-shielding film formed by covering the convex portion 9 formed integrally with the display element facing surface of the protective plate 8 on the outer peripheral portion of the display element facing surface of the protective plate 8 by pressing 11 while abutting against the surface on the observation side of the liquid crystal display element 1 through 11, and by applying the applied pressure, the filler is spread over the entire region surrounded by the convex portion 9 while maintaining the pressurized state. UV light from the outer surface side of the protective plate 8 for a certain time Shines, then, the releasing the pressure, to produce in a way that for a predetermined time, the filling material of the polymerization temperature was hold heat in the atmosphere.

  In the manufacture of the protective plate integrated display panel, the filler supplied on the protective plate 8 is formed by pressing the liquid crystal display element 1 on top of the filler to press the liquid crystal display element 1 and the protective plate. A region surrounded by the convex portion 9 in the gap between the liquid crystal display element 1 and the protective plate 8 is pushed and spread while discharging air between the liquid crystal display element 1 and the protective plate 8. The whole is filled.

  In this embodiment, the convex portion 9 is formed in a rectangular frame shape surrounding the screen area corresponding region 8a, and the missing portion 10 is provided at each of its four corners. The air between the protective plate 8 is discharged from the missing portions 10 at the four corners, and the filler is surrounded by the convex portion 9 in the gap between the liquid crystal display element 1 and the protective plate 8. The entire area can be evenly filled.

  The amount of the filler supplied onto the protective plate 8 depends on the volume of the region surrounded by the convex portion 9 in the gap between the liquid crystal display element 1 and the protective plate 8. The amount of protrusion of the filler from the portion 10 to the outside is set as small as possible.

  Ultraviolet polymerization of the filler filled in the region surrounded by the convex portion 9 in the gap between the liquid crystal display element 1 and the protective plate 8 is performed while maintaining the pressurized state. This is performed by irradiating ultraviolet rays from the outer surface side.

  As described above, when the ultraviolet ray is irradiated from the outer surface side of the protective plate 8 while maintaining the pressurized state, the filler made of the polymer material having both the ultraviolet polymerizable property and the thermal polymerizable property is first converted into the ultraviolet ray. The liquid crystal display element 1 and the protective plate 8 are bonded to each other via the ultraviolet-polymerized filler layer.

  Irradiation of the ultraviolet ray is performed for a time slightly longer than the time required for the filler to undergo ultraviolet polymerization, depending on the properties of the filler, and then the pressure is released to polymerize the filler. The filler is thermally polymerized by being left in a heated atmosphere maintained at a temperature.

  As described above, when the filler filled in the region surrounded by the projection 9 in the gap between the liquid crystal display element 1 and the protective plate 8 is further polymerized by ultraviolet polymerization, The entire layer of filler is uniformly polymerized without unevenness.

  That is, in the ultraviolet polymerization of the filler, the ultraviolet light irradiated from the outer surface side of the protective plate 8 is blocked by the light shielding film 11 formed on the outer peripheral portion of the protective element 8 on the display element facing surface. When the protective plate 8 is printed for decoration or the like, the ultraviolet rays are blocked by the printed film, thereby corresponding to the light shielding film 11 or the printed film of the ultraviolet-polymerized filler. Even if an insufficiently polymerized part or an unpolymerized part remains in the part, the insufficiently polymerized part or the unpolymerized part of the filler due to the ultraviolet irradiation is polymerized by heating after the ultraviolet irradiation.

  In the thermal polymerization of the filler, since the liquid crystal display element 1 and the protective plate 8 are already joined by ultraviolet polymerization of the filler, the polymerization temperature of the filler is maintained without maintaining the pressurized state. The heating can be carried out by leaving the filler in a heating atmosphere maintained for at least the time required for thermal polymerization.

  The filling layer 12 formed by ultraviolet polymerization and thermal polymerization of the filler has an appropriate elasticity such as a rubber film. Therefore, when an impact is applied to the outer surface of the protection plate 8, The impact can be buffered by the filling layer 12, and the liquid crystal display element 1 can be protected from the impact.

  The protective plate-integrated display panel has an observation surface protection in which a projection 9 having a predetermined height is integrally formed on the observation side of the liquid crystal display element 1 so as to surround a region 8 a corresponding to the screen area of the liquid crystal display element 1. The plate 8 is disposed with the convex portion 9 in contact with the surface on the observation side of the liquid crystal display element 1, and is surrounded by the convex portion 9 in the gap between the liquid crystal display element 1 and the protective plate 8. Since the elastic filling layer 12 made of the polymer of the polymer material is provided in a region where the liquid crystal display element 1 and the protective plate 8 are surrounded by the convex portion 9, In this case, the bonding strength between the liquid crystal display element 1 and the protective plate 8 can be increased.

  In addition, the protection plate integrated display panel has a projection 9 for defining the gap between the liquid crystal display element 1 and the protection plate 8 and the filling region of the filling layer 12 on the observation surface protection plate 8. Therefore, the protective plate 8 is disposed on the observation side of the liquid crystal display element 1 with the convex portion 9 in contact with the surface on the observation side of the liquid crystal display element 1, and the liquid crystal display element 1. It can be easily manufactured by forming the elastic filling layer 12 in a region surrounded by the convex portion 9 in the gap between the protective plate 8 and the protective plate 8.

  Furthermore, in the protective plate integrated display panel, the filling layer 12 is surrounded by the convex portion of the gap between the display element having both ultraviolet polymerizable properties and thermal polymerizable properties and the protective plate. Since it is formed of a polymer of a polymer material filled in the region, the filler made of the resin in the region surrounded by the convex portion 9 in the gap between the liquid crystal display element 1 and the protective plate 8 The filling material is polymerized by ultraviolet irradiation while maintaining the pressurized state in which the convex portion 9 of the protective plate 8 is in contact with the liquid crystal display element 1, and then the pressure is released. Then, by leaving the heated material kept at the polymerization temperature of the filler for a certain period of time to thermally polymerize the insufficiently polymerized part and unpolymerized part in the ultraviolet irradiation, the entire layer of the filler is uniformly distributed. Forming a polymerized packed bed 12; Can.

  On the other hand, when the filling layer 12 is formed of a resin having only ultraviolet polymerizability, the resin can be polymerized in the same ultraviolet irradiation time as in the above examples, but the ultraviolet light is irradiated. Insufficient polymerization or unpolymerized portions may remain as they are, and sufficient bonding strength between the liquid crystal display element 1 and the protective plate 8 cannot be obtained.

  On the other hand, when the filling layer 12 is formed of a resin having only thermopolymerizability, the heating time required to polymerize the resin is longer than that of ultraviolet polymerization, and thus the protective plate 8 is used during the heating time. The pressure state in which the convex portion 9 is brought into contact with the liquid crystal display element 1 must be maintained.

  The protective plate-integrated display panel of the above embodiment forms the filling layer 12 by polymerizing a filler made of a polymer material having both ultraviolet polymerizable properties and heat polymerizable properties by ultraviolet irradiation and heating. Therefore, the insufficiently polymerized portion or the unpolymerized portion does not remain in the filling layer 12, and therefore the bonding strength between the liquid crystal display element 1 and the protective plate 8 can be sufficiently ensured.

  Further, in this protection plate integrated type display panel, since the filling layer 12 has an appropriate elasticity such as a rubber film, when the impact is applied to the outer surface of the protection plate 8, the impact is reduced. The liquid crystal display element 1 can be protected from the impact by buffering by the filling layer 12.

  The filling layer 12 is preferably formed of a resin having both the ultraviolet polymerizable property and the thermal polymerizable property, but is a polymer of a polymer material having only the ultraviolet polymerizable property, or only the thermal polymerizable property. It may be formed of a polymer of a polymer material having

  Further, the protective plate integrated display panel of the above embodiment includes the liquid crystal display element 1 as a display element for displaying an image. However, the display element is not limited to the liquid crystal display element, and an electroluminescence display element, Further, a plasma display element or the like may be used.

1 is a side view of a protection plate integrated display panel according to a first embodiment of the present invention. The expanded sectional view of the one end part of the said protection plate integrated display panel. The top view seen from the convex part formation surface side of the observation surface protection board in the said protection plate integrated display panel.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Liquid crystal display element, 2, 3 ... Board | substrate, 4 ... Sealing material, 5 ... Liquid crystal layer, 6, 7 ... Polarizing plate, 8 ... Observation surface protective plate, 9 ... Convex part, 10 ... Missing part, 11 ... Light shielding film , 12 ... packed bed.

Claims (4)

A pair of substrates on the opposite side and an observation side bonded via a sealing material, and a liquid crystal layer is sealed in a region surrounded by the sealing material in a gap between the pair of substrates; A pair of polarizing plates on the outer surface and the opposite side are arranged, and a display element for displaying an image,
The display element has an area covering the observation side surface, and a convex portion having a predetermined height surrounding a region corresponding to the screen area of the display element is formed on the surface facing the display element. On the observation side of the element, the projection is placed in contact with the observation side surface of the polarizing plate on the observation side of the display element so as to overlap the outer peripheral edge of the polarizing plate on the observation side. The board,
An elastic filling layer made of a polymer of a polymer material filled in a region surrounded by the convex portion of the gap between the display element and the protective plate;
A protective plate-integrated display panel comprising: The convex portions, wherein the display element is formed in a frame shape that surrounds the area corresponding to the screen area, the at least a portion missing portion communicating the outer and a space surrounded by the convex portion and the convex portion The protective plate-integrated display panel according to claim 1, further comprising: 3. The protection plate integrated display panel according to claim 1, wherein the filling layer is formed of a polymer of a polymer material having both ultraviolet polymerizable property and thermal polymerizable property. The light-shielding film is formed in the outer peripheral part of the surface facing the said liquid crystal display element of the said observation surface protection board so that the said convex part may be covered in the whole region outside the said screen area. The protective plate integrated display panel according to any one of claims 1 to 3.

Images