JP2010134120A - Display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display easily obtaining a configuration for preventing an electrical short circuit from occurring between a display panel and the outside, while making a frame narrower. <P>SOLUTION: The display includes the display panel, a placement table on which the display panel is placed, and an insulating sheet arranged under the placement table. The display panel includes an exposed conductive member in the side surface of the display panel and the insulating sheet covers the conductive member in the side surface of the display panel, in such a manner that at least one side of the insulating sheet is turned up. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a display device. More specifically, the present invention relates to a display device that performs display drive control using a conductive member in a display panel.

As display panels provided in electronic devices such as televisions, personal computers, mobile phones, digital cameras and the like that have been widely used in recent years, liquid crystal display (LCD) panels, plasma display panels (PDPs), Examples thereof include an electroluminescence (EL) display panel.

In addition to such a display panel, the display device includes an electronic member for driving and controlling the display panel, an optical member for controlling light used for display, and the like. And these members are being fixed by the bezel etc. which comprise the outer frame of a display apparatus. FIG. 13 is an exploded perspective schematic view of a general liquid crystal display device (for example, see Patent Document 1).

As shown in FIG. 13, the liquid crystal display device includes a reflection plate 111, a light source 114, a light guide plate 113, a diffusion plate 115a, a prism sheet 115b, a liquid crystal cell 117, and a bezel 118. The light source 114 is a rod-shaped lamp, and a light guide plate 113 is disposed next to the light source 114. By arranging the light guide plate 113, the light emitted from the light source 114 can be switched to planar light having the size of the light guide plate 113. A reflection plate 111 is attached to the back surface of the liquid crystal display device, and the light emitted from the light source 114 can be reflected toward the liquid crystal cell 117. Next to the light guide plate 113, a diffusion plate 115a is disposed. By disposing the diffusion plate 115a, the light of the surface light source emitted from the light guide plate 113 can be converted into light of uniform intensity. A prism sheet 115b is disposed next to the diffusion plate 115a. By arranging the prism sheet 115b, the light emitted from the diffusion plate 115a can be collected. The light condensed by the prism sheet 115b enters the adjacent liquid crystal cell 117.

The liquid crystal cell 117 is made of glass, and a liquid crystal layer is disposed inside. In addition, polarizing films that limit the vibration direction of transmitted light are attached to both surfaces of the liquid crystal cell 117. The light emitted from the prism sheet 115 b is limited by the polarizing film attached to the incident surface of the liquid crystal cell 117, and only the light that vibrates in a predetermined direction enters the liquid crystal cell 117. Then, using the polarizing film attached to the incident surface of the liquid crystal cell 117, the light oscillating in the predetermined direction is dispersed when passing through the liquid crystal layer, and is attached to the other surface of the liquid crystal cell 117. When the light is transmitted through the polarizing film, the vibration direction of the light is further restricted to control the transmission and non-transmission of the light and to control the on and off of the display. A bezel 118 is disposed next to the liquid crystal cell 117. The bezel 118 has a box shape with one side open.
JP 2006-133651 A

The present inventor has examined the performance improvement of the display device, and has focused on the fact that the display screen may cause unexpected unlighting. A conductive member disposed inside the display panel such as a liquid crystal display panel may be exposed to the outside from the side surface of the display panel in the manufacturing process, and configures the exposed conductive member and the outer frame of the display device. When the metal bezel touches, an electrical short circuit occurs between them, causing unstable voltage in the display panel and causing the display screen to not light up. I found.

Subsequently, the inventor conducted various studies on means for preventing an electrical short circuit between the conductive member exposed to the outside from the side surface of the display panel and the bezel. As a means for preventing an electrical short circuit, a method of inserting an insulating partition member made of resin or the like between the display panel and the bezel can be considered. As an example of such a partition member, a display panel is used. It is conceivable to use a mounting table for supporting. Specifically, at the stage of performing the injection molding of the mounting table, a configuration in which a part of the mounting table is molded so as to extend in the height direction and the extending part of the mounting table surrounds the outer periphery of the display panel is provided. It is possible. Thereby, an insulating partition member can be provided between the display panel and the bezel using a member included in the display device. However, in order to extend a part of the mounting table by injection molding in order to provide an insulating partition member, a certain thickness width (horizontal width) is required in the extending part in the manufacturing process, and at least the display panel and the bezel A fixed interval is formed between the two. This is not preferable for the goal of reducing the frame of a display device that has been required in recent years. On the other hand, for example, there is a method in which an insulating resin film is applied to the side surface of the display panel where the conductive member is exposed, or an insulating process is performed on the side surface of the display panel by attaching an insulating tape. Conceivable. However, in order to provide such an insulating member, a separate process for directly processing the display panel is required, and a new problem that the manufacturing cost is higher is included.

The present invention has been made in view of the above-described present situation, and a display device capable of easily obtaining a configuration that prevents an electrical short-circuit between the display panel and the outside while achieving a narrow frame. Is intended to provide.

As a result of various studies on means for solving such problems, the present inventor has paid attention to the arrangement relationship of each member constituting the display device. Then, a thin sheet having an insulating property is prepared below the mounting table on which the display panel is mounted so as to be wider than the bottom area of the display device, and at least one side of the sheet is folded back to expose the conductive surface exposed on the side surface of the display panel. By adjusting the folded portion of the sheet so as to cover the member and forming an insulating partition member between the display panel and the outside, there is no need to perform a complicated manufacturing process. The inventors have found that an electrical short circuit can be prevented from occurring with the outside, and have conceived that the above problems can be solved brilliantly, and have reached the present invention.

That is, the present invention is a display device comprising a display panel, a mounting table on which the display panel is mounted, and an insulating sheet disposed under the mounting table, the display panel being exposed on the side surface of the display panel. The insulating sheet is a display device that covers at least one side and covers the conductive member on the side surface of the display panel. The display device of the present invention will be described in detail below.

The display device of the present invention includes a display panel, a mounting table on which the display panel is mounted, and an insulating sheet disposed under the mounting table. Examples of the display panel include an LCD panel, an EL display panel, and a PDP. In the case where the display panel is a liquid crystal display panel, conductive members such as electrodes and wirings for driving the liquid crystal are easily exposed to the outside from the side surface of the liquid crystal display panel. As long as the mounting table is a member that can support the display panel, its structure, material, size, and the like are not particularly limited, but the display table may be formed in an annular shape along the outer periphery of the display panel. It is preferable from the viewpoint of support effect. By providing such a mounting table, members other than the display panel such as a light source, a light guide plate, and an optical film can be efficiently arranged.

The display panel includes a conductive member exposed on a side surface of the display panel. The conductive member is one in which the conductive member in the display panel is exposed to the outside of the display panel. Accordingly, examples of the conductive member include conductive members such as wirings and electrodes used for driving the display panel. These conductive members are easily affected by an electrical short circuit directly with the outside. Therefore, an insulating partition member is placed between the conductive member and the outside to prevent them from conducting. Problems such as non-lighting of the screen can be solved, and display reliability can be greatly increased.

The insulating sheet is folded at least on one side to cover the conductive member on the side surface of the display panel. Here, “covering” does not necessarily mean that the covering member and the covering member are not in contact with each other. The insulating sheet preferably has a height that covers at least half of the side surface of the display panel when viewed from the cross-sectional direction of the display panel (direction perpendicular to the main surface of the display panel). More preferably, the insulating sheet has a height that covers the entire side surface of the display panel.

The insulating sheet functions as a partition member that prevents an electrical short circuit between the display panel and the outside. Examples of the arrangement form of the sheet include a form in which the sheet itself constitutes the bottom surface of the display device, and a form in which the sheet is arranged along a member constituting the bottom surface of the display device. The “sheet” is a concept including a film, and means a thickness of 0.1 mm or less. According to the sheet-like member, the space between the outside and the display panel can be reduced while forming an insulating partition member that prevents an electrical short circuit between the display panel and the outside. It is also effective in narrowing the frame of the device. Further, by arranging such a sheet-like member under the mounting table, the insulating sheet uses light even if optical members such as a light source, a light guide plate, and an optical film are arranged on the side of the mounting table. Does not affect efficiency reduction. Furthermore, according to the sheet-like member, it is easy to fold compared to a member having a large thickness (a member having a thickness greater than 0.1 mm).

In the present specification, the display panel side with respect to the mounting table is “upper” and the opposite side is “lower”. That is, in the present invention, the display panel is located on the mounting table. Further, the direction orthogonal to the upper or lower direction is defined as “horizontal”.

The configuration of the display device of the present invention may or may not include other components as long as such components are essential.

A preferred embodiment of the display device of the present invention will be described in detail below.

The insulating sheet preferably has reflectivity. When an optical member such as a light source, a light guide plate, or an optical film is disposed on the side of the mounting table, a reflective sheet (hereinafter also referred to as a reflective sheet) is disposed under the mounting table, thereby displaying the display panel. Since the light emitted in the opposite direction is reflected by the reflecting sheet and travels toward the display panel, the light use efficiency can be improved. In this embodiment, since such a reflection sheet is effectively used as the insulating sheet, the effect of the present invention of preventing a short circuit between the display panel and the outside can be obtained without performing a new manufacturing process. . In the present specification, “reflectivity” refers to a reflectance of at least 70% or more.

The insulating sheet preferably has a shape in which a cutout is provided in at least one corner of a rectangle. The shape of the insulating sheet here indicates the state before folding. If the shape of the insulating sheet before the cutout is rectangular, the cutout is provided at the corner of the rectangle, so that when the two or more sides of the insulating sheet are folded back, there is no cutout at the corner. As compared with a simple rectangular insulating sheet that is not provided, folding can be performed more easily, and a partition member having a well-balanced shape can be manufactured.

The insulating sheet preferably has a shape in which notches are provided at four corners of a rectangle. The shape of the insulating sheet here indicates the state before folding. When the shape of the insulating sheet before the cutout is provided has a rectangular shape, such a cutout is provided when the four sides of the rectangular insulating sheet are folded. As compared with the case where it is not, folding can be performed more easily, and a well-balanced partition member can be produced. In addition, according to this form, the insulating sheet which has the following box shape can be produced easily.

The shape of the notch is preferably rectangular or square. Since the notch provided in the corner of the rectangle has such a shape, a partition member having a well-balanced shape can be produced when at least one side of the sheet is folded at a right angle.

The insulating sheet preferably has a box shape formed by folding four sides. By folding the four sides of the insulating sheet, the entire outer periphery of the display panel can be enclosed, so that a sufficient insulating effect can be obtained on any side of the display panel, and the frame can be narrowed. The effect can be obtained particularly greatly.

The mounting table and the insulating sheet are preferably fixed to each other by an adhesive layer beside the mounting table. In order to fix the shape of the folded insulating sheet, the insulating sheet is preferably bonded to some member, but it is particularly preferable to effectively use the mounting table as the member. When the insulating sheet placed under the mounting table is folded, it is not necessary to create an extra space by placing the folded portion of the insulating sheet along the mounting table. Therefore, an adhesive layer is formed on the side of the mounting table. By adhering the insulating sheet and the insulating sheet, it becomes an efficient configuration that realizes both fixing and narrowing of the insulating sheet at a time.

The mounting table and the insulating sheet are preferably fixed to each other by an adhesive layer under the mounting table. Since the insulating sheet is disposed under the mounting table, it is preferable to form an adhesive layer at a position where these members are in contact with each other in order to prevent positional displacement of these members. Moreover, it becomes easy to fold a sheet | seat along a mounting base by preventing the position shift of an insulating sheet.

The display device preferably includes an outer frame member that surrounds an outer periphery of the insulating sheet, and the insulating sheet is preferably sandwiched between the outer frame member and the mounting table and fixed to each other. In order to fix the folded portion of the insulating sheet, by arranging an outer frame member on the outside of the folded portion of the insulating sheet, it is possible to fix the folded portion of the sheet without separately providing an adhesive layer. The manufacturing process is simplified, leading to cost reduction. In addition, fixability can be further increased by providing a fitting hole in each of the outer frame member, the reflection sheet, and the mounting table, and fitting a member for fitting them. That is, it is preferable that the outer frame member, the insulating sheet, and the mounting table have a fitting hole at a position where they overlap each other, and the fitting member is fitted in the fitting hole. Even if a metal having high rigidity is used as the material of the outer frame member, an electrical short circuit between the display panel and the outer frame member is prevented by the above-described configuration of the present invention. The panel and the outer frame member can be brought into close contact with each other, and the fixing of the partition member and the narrowing of the frame of the display device can be realized at a time, resulting in a highly efficient structure. In addition, the “outer frame member” in the present embodiment preferably has a function of fixing the arrangement of each member included in a display device such as a display panel, as in the case of the above-described bezel. It becomes a typical configuration.

Preferably, the display panel includes a pair of substrates and a liquid crystal layer sandwiched between the pair of substrates, and the conductive member is a liquid crystal driving conductive member included in at least one of the pair of substrates. That is, in this embodiment, a liquid crystal display panel is used as the display panel, and a liquid crystal display device is used as the display device. The liquid crystal display device of the present invention can be manufactured by preparing a pair of insulating substrates such as glass and injecting a liquid crystal layer between the pair of substrates. In addition, a conductive member such as an electrode or a wiring is provided on at least one of the pair of substrates so that a constant voltage is applied to the liquid crystal layer. Since the liquid crystal driving conductive member for applying a voltage to the liquid crystal layer needs to be disposed in a region facing the liquid crystal layer, according to the configuration in which the pair of substrates sandwich the liquid crystal layer as described above, In the manufacturing process, the liquid crystal driving conductive member is easily exposed on the side surface of the substrate from between the pair of substrates. On the other hand, according to the configuration of the present invention, even when the liquid crystal driving conductive member is exposed to the outside as described above, since the insulating partition member is provided, the liquid crystal driving conductive member is provided between the display panel and the outside. An electrical short circuit is prevented from occurring.

According to the display device of the present invention, even when the conductive member is exposed to the outside of the display panel, a short circuit between the display panel and the outside can be prevented by the sheet-like partition member having insulation. Moreover, since such a partition member is devised so as to be efficiently arranged, it is possible to reduce the frame of the display device without performing a complicated manufacturing process.

Embodiments will be described below, and the present invention will be described in more detail with reference to the drawings. However, the present invention is not limited only to these embodiments.

(Embodiment 1)
FIG. 1 is an exploded perspective schematic view of the liquid crystal display device according to the first embodiment. As shown in FIG. 1, the liquid crystal display device of Embodiment 1 includes a reflective sheet 11, a resin frame (mounting table) 12, a light guide plate 13, a light emitting diode-flexible printed circuit (LED) from the back side toward the display surface side. -FPC) substrate 14, optical sheet 15, adhesive tape (RIM tape; adhesive layer) 16, liquid crystal display panel 17, and front bezel (outer frame member) 18 are provided in this order. As described above, the display device according to the first embodiment is a liquid crystal display device, and includes a liquid crystal display panel as a display panel. Further, an electronic member and an optical member for effectively using the liquid crystal display panel, and fixing these members are used. A fixing member is provided. In addition, the optical member comprised with the reflection sheet 11, the resin frame 12, the light-guide plate 13, the light emitting diode-flexible printed circuit (LED-FPC) board | substrate 14, the optical sheet 15, etc. is also called a backlight. Hereinafter, each member will be described in order.

FIG. 2 is a schematic cross-sectional view of the liquid crystal display device according to the first embodiment. In the first embodiment, the liquid crystal display panel 17 includes a pair of substrates 21 and 22 and a liquid crystal layer sandwiched between the pair of substrates 21 and 22. On at least one surface of the pair of substrates 21 and 22, liquid crystal driving conductive members such as electrodes and wirings for controlling the orientation of the liquid crystal molecules in the liquid crystal layer are formed. Examples of the driving method of the liquid crystal display panel include an active matrix type and a passive matrix type. In the first embodiment, any driving method may be adopted.

FIG. 3 is an exploded perspective schematic view of the liquid crystal display panel of Embodiment 1 when the liquid crystal display panel has an active matrix driving method. The pair of substrates 21 and 22 constituting the liquid crystal display panel 17 are insulating glass substrates. In the present embodiment, the substrate closer to the display surface is the upper glass substrate 21, and the substrate closer to the back surface is the lower glass substrate 22. Each of the upper glass substrate 21 and the lower glass substrate 22 has an electrode on the surface on the side facing each other. In the present embodiment, the material of the pair of substrates 21 and 22 is not particularly limited to glass as long as it has insulating properties, and a resin may be used. Further, the upper glass substrate 21 and the lower glass substrate 22 do not necessarily have electrodes, and at least one glass substrate has an electrode on the surface facing the other glass substrate. Just do it. Examples of liquid crystal alignment modes when electrodes are formed on both of the pair of substrates 21 and 22 include a vertical alignment (VA) mode and a twisted nematic (TN) mode. As an alignment mode of the liquid crystal when an electrode is formed on either one of the pair of substrates 21 and 22, for example, an in-plane switching (IPS) mode is given.

A plurality of pixel electrodes 43 are arranged in a matrix on the upper surface of the lower glass substrate 22, and one pixel electrode 43 corresponds to one pixel. Also, a plurality of vertical and horizontal wirings 41 and 42 intersecting each other are formed so as to surround the pixel electrode 43, and one thin film transistor (TFT) 45 is provided for each pixel electrode 43. The switching elements for controlling the application of the signal voltage to the pixel electrodes 43 are arranged at the intersections of the plurality of wirings 41 and 42 in the vertical and horizontal directions. For example, one of the plurality of wirings 41 and 42 in the vertical direction and the horizontal direction is a signal wiring 41 for applying a signal voltage to the pixel electrode 43, and the other one is a scanning wiring 42 for controlling on / off of the TFT. .

A counter electrode 44 is formed on the entire surface of the lower surface of the upper glass substrate 21. An electric field can be generated in the liquid crystal layer by applying a predetermined voltage to the pixel electrode 43 and the counter electrode 44.

According to such an active matrix driving method, since the formation of an electric field in the liquid crystal layer is controlled for each pixel by the switching function of the TFT 45, high-definition display can be controlled.

Examples of the method for forming the pixel electrode 43 and the counter electrode 44 include a sputtering method, a chemical vapor deposition (CVD) method, a vapor deposition method, and the like. The pixel electrode 43 can be patterned into a pixel shape by further using a photolithography method. As a material of the pixel electrode 43 and the counter electrode 44, a transparent metal oxide film such as indium tin oxide (ITO) is preferably used.

Examples of the method for forming the signal wiring 41 and the scanning wiring 42 include a sputtering method, a CVD method, and a vapor deposition method. Further, it can be patterned into a desired shape using a photolithography method. As the material of the signal wiring 41 and the scanning wiring 42, a metal having a low resistance and a high melting point such as aluminum (Al), silver (Ag), tantalum nitride (TaN), titanium nitride (TiN), molybdenum nitride (MoN), etc. It is preferable to use from the viewpoint of conductivity and reliability.

FIG. 4 is an exploded perspective schematic view of the liquid crystal display panel of Embodiment 1 when the liquid crystal display panel has a passive matrix driving method. Each of the upper glass substrate 21 and the lower glass substrate 22 has a plurality of linear electrodes 46 and 47 on the surfaces facing each other. If the electrode formed on the lower surface of the upper glass substrate 21 is the upper electrode 46, the extending directions of the plurality of upper electrodes 46 are parallel to each other. If the electrode formed on the upper surface of the lower glass substrate 22 is the lower electrode 47, the extending directions of the plurality of lower electrodes 47 are parallel to each other. On the other hand, the extending direction of the upper electrode 46 and the extending direction of the lower electrode 47 intersect each other.

According to such a passive matrix driving method, when a signal voltage is applied to each of them in time series, the upper electrode 46 to which the signal voltage is applied, and the lower electrode 47 to which the signal voltage is applied, Since an electric field is formed in the liquid crystal layer located at the intersection of the liquid crystal molecules, the alignment of the liquid crystal molecules can be individually controlled by adjusting the timing of applying the signal voltage.

As a method of forming the upper electrode 46 and the lower electrode 47, a conductive film is formed over the upper glass substrate 21 and the lower glass substrate 22 by a sputtering method, a CVD method, a vapor deposition method or the like, and then a photolithography method is used. And patterning into a desired shape. As the material of the upper electrode 46 and the lower electrode 47, a transparent metal oxide film such as indium tin oxide (ITO) is preferably used.

Thus, in a liquid crystal display panel having an active matrix type driving method or a passive matrix type driving method, at least one glass substrate has an electrode on the surface facing the other glass substrate. ing. When the upper glass substrate 21 and the lower glass substrate 22 are bonded together, the signal wiring 41, the scanning wiring 42, the pixel electrode 43, the counter electrode 44, the upper electrode 46, the lower electrode 47, etc. A part of the liquid crystal driving conductive member may be exposed to the outside from the side surface of the liquid crystal display panel 17.

In FIG. 2, the portion shown in gray on the side surface of the liquid crystal display panel 17 is the conductive member 10 exposed to the outside of the liquid crystal display panel from the side surface of the liquid crystal display panel as described above. The conductive member 10 is not limited to an electrode, wiring, or the like for driving and controlling the liquid crystal display as described above, and is not particularly limited as long as it is a conductive member exposed from the liquid crystal display panel.

Polarizing plates 31 and 32 are disposed on the upper surface of the upper glass substrate 21 and the lower surface of the lower glass substrate 22, respectively. These polarizing plates 31 and 32 include a polarizer that can convert natural light emitted from a light source into polarized light that vibrates in a certain direction (polarization axis direction). As the polarizer, a polyvinyl alcohol (PVA: Poly Vinyl Alcohol) film obtained by adsorbing an iodine complex or a dichroic dye can be used, and the polarizer is produced by stretching the film in one direction. Moreover, a triacetyl cellulose (TAC: Tri Acetyl Cellulose) film is bonded on both sides or one side of the polarizer as a protective film for protecting the polarizer. A TAC film is excellent as a protective film for protecting a polarizer in particular because it has low depolarization (the property of breaking polarized light) and is excellent in translucency and durability.

If the polarizing plate disposed on the upper surface of the upper glass substrate 21 is the upper polarizing plate 31 and the polarizing plate disposed on the lower surface of the lower glass substrate 22 is the lower polarizing plate 32, The polarization axis of the side polarizing plate 32 is preferably orthogonal or parallel. These may be either orthogonal or parallel to each other. The alignment mode of the liquid crystal, or whether the display is white when no voltage is applied to the liquid crystal layer (normally white mode) ) Or black display (normally black mode).

The liquid crystal display device according to the first embodiment includes a resin frame 12 on which the liquid crystal display panel 17 is placed below the liquid crystal display panel 17. The liquid crystal display panel 17 and the resin frame 12 are bonded to each other by an adhesive RIM tape 16 and fixed to each other. As the material of the adhesive layer 16, for example, a rubber-based, acrylic-based, vinyl ether-based, or silicone-based elastomer added with a low molecular weight tackifier can be used. Examples of the material of the resin frame 12 include resins such as polycarbonate, acrylic resin, and polypropylene. As shown in FIG. 1, the resin frame 12 is formed in an annular shape along the outer periphery of the liquid crystal display panel 17, and the adhesive layer 16 is on the surface of the resin frame 12, that is, along the outer periphery of the liquid crystal display panel 17. It is provided in an annular shape.

In the liquid crystal display device of Embodiment 1, a light guide plate is disposed under the liquid crystal display panel 17, and a light source is disposed on the side of the light guide plate, thereby providing a sidelight (edge light) type backlight system. it can. On the other hand, by arranging a light source under the liquid crystal display panel 17 without providing a light guide plate, a direct backlight type can be obtained.

In the first embodiment, the liquid crystal display device includes a light guide plate 13 and uses a light emitting diode (LED) -flexible printed circuit (FPC) substrate as the light source 14. The LED-FPC board is a board formed by integrating an LED and an FPC, and the LED included in the LED-FPC board is used as a light source for liquid crystal display. As the light source 14, in addition to the LED, a cold cathode fluorescent lamp (CCFL), an organic light emitting element (OEL), or the like can be used. The light guide plate 13 is not particularly limited as long as it is a colorless and transparent plate-like member capable of guiding light incident in the light guide plate 13 in the display screen direction. In the side light (edge light) type backlight system, the light emitted from the light source 14 is once incident on the light guide plate 13 from the side surface of the light guide plate 13, and the incident light is provided on the light guide plate 13. The light is reflected, refracted, and diffused by the pattern, and is emitted from the main surface side of the light guide plate 13 toward the liquid crystal display panel 17 as planar emitted light. Between the light guide plate 13 and the liquid crystal display panel 17, one or more optical films 15 such as a diffusion plate and a prism sheet may be arranged.

A reflective sheet (insulating sheet) 11 is disposed under the resin frame 12. The reflection sheet 11 is a member that can improve the light utilization efficiency by reflecting the light emitted from the light source 14 on the surface of the reflection sheet 11 and directing the light toward the liquid crystal display panel 17 side. In Embodiment 1, the reflection sheet 11 is made of an insulating material, and is used as a partition member for preventing the liquid crystal display panel 17 from being electrically short-circuited with the outside. As a result, the efficiency of the manufacturing process and the cost reduction can be realized. Examples of the material of the reflection sheet 11 include polyethylene terephthalate (PET), a multilayer structure of polyester resin, and a mixture of polyester resin and urethane resin.

As shown in FIG. 1, in Embodiment 1, the partition member has a box shape formed by folding the four sides of the reflection sheet 11 at right angles, so that all four side surfaces of the liquid crystal display panel 17 are formed. The structure can be covered and well-balanced. The folded portion of the reflection sheet 11 is extended to the height of the upper surface of the upper glass substrate 21, and a sufficient insulating effect can be obtained. The film thickness of the reflective sheet 11 is 0.1 mm or less and 0.03 mm or more. For example, by setting the thickness of the reflective sheet 11 to 0.05 mm, it is possible to sufficiently obtain the effect of preventing leakage while narrowing the frame.

The reflection sheet 11 has a shape in which cutouts are provided at four corners of a rectangle before folding. 5A and 5B are schematic diagrams illustrating the shape of the reflection sheet 11 according to the first embodiment. FIG. 5A is a development view before folding, and FIG. 5B is a perspective view after folding. A dotted line is a folding line, and as shown in FIG. 5, the reflection sheet 11 before folding has a shape in which square cutouts are provided at all four corners of the rectangle. A line extending from the top of the corner of the reflection sheet 11 formed by cutting out the corner of the cutout portion (hereinafter also referred to as a cutout point) toward the cutout of the opposite corner is folded back. Become a line. A folded portion formed by folding the reflection sheet 11 constitutes the wall surface of the partition member and covers the side surface of the liquid crystal display panel 17. When the height of the wall surface is different for each surface, the shape of the notch may be a rectangle. The shape of the notch is not necessarily a square or a rectangle, but it is preferably a square or a rectangle having a right angle from the viewpoint of balancing the shape when folded at a right angle.

In Embodiment 1, the shape before the reflection sheet 11 is folded may be a shape as shown in FIGS. 6-9 is a schematic diagram showing modified examples 1-4 of the shape of the reflective sheet 11 in the first embodiment, where (a) is a developed view before folding, and (b) is a perspective view after folding. Show. 6 shows a first modification, FIG. 7 shows a second modification, FIG. 8 shows a third modification, and FIG. 9 shows a fourth modification. By design, when it is not necessary to arrange an insulating partition member between the liquid crystal display panel 17 and when it is not necessary to narrow the frame, it is not necessary to use a reflective sheet but another insulating member between the outside and the liquid crystal display panel. In the case of preventing the continuity, the shape of the reflection sheet 11 may be modified as the first to fourth modifications as appropriate.

In Modification 1 of Embodiment 1 shown in FIG. 6, the reflection sheet 11 has a shape in which notches are provided at both ends of one side of a rectangle. When the reflection sheet before being folded has such a shape, when the three sides of the reflection sheet 11 are folded at right angles, it is possible to produce a well-balanced partition member in which adjacent surfaces are orthogonal to each other.

In the second modification of the first embodiment shown in FIG. 7, the reflection sheet 11 has a shape in which a cutout is provided at one corner of a rectangle. When the reflection sheet before being folded has such a shape, when two adjacent sides of the reflection sheet 11 are folded at a right angle, a well-divided partition member in which the adjacent surfaces are orthogonal to each other can be produced. .

In the modification 3 of Embodiment 1 shown in FIG. 8, the reflection sheet 11 has a rectangle. When the reflection sheet before folding has such a shape, when the two opposing sides of the rectangle are folded at right angles, it is possible to produce a well-balanced partition member in which the facing surfaces are parallel to each other.

In the modification 4 of Embodiment 1 shown in FIG. 9, the reflective sheet 11 has a rectangle. When the reflection sheet before being folded has such a shape, when any one side of the reflection sheet 11 is folded at a right angle, a well-divided partition member can be produced.

The liquid crystal display device of Embodiment 1 includes a front bezel (outer frame member) 18 that surrounds the outer periphery of the upper surface of the liquid crystal display panel 17 and the entire side surface of the liquid crystal display panel 17. The front bezel 18 serves to fix the liquid crystal display panel 17 and other members constituting the liquid crystal display device. Therefore, as the front bezel 18, a material having high rigidity is preferably used, and a metal material having conductivity such as stainless steel or aluminum is preferably used. Conventionally, when such a conductive metal is used as the front bezel, when the liquid crystal display panel and the front bezel are brought close to each other for the purpose of narrowing the frame of the display device, they come into contact with each other, and the liquid crystal display An electrical short circuit may occur between the liquid crystal driving conductive member exposed to the outside of the panel and the metal bezel. On the other hand, according to the configuration of the liquid crystal display device of the first embodiment, the partition member using the reflective sheet 11 having an insulating property is disposed between the front bezel 18 and the liquid crystal display panel 17. Even if the width between the liquid crystal display panel 18 and the liquid crystal display panel 18 is reduced, an electrical short circuit between the front bezel 17 and the liquid crystal display panel 18 is prevented by the partition member. Further, according to the configuration of the first embodiment, the folded portion of the reflective sheet 11 is sandwiched and fixed to each other by the front bezel 18 and the resin frame 12 that are close to the liquid crystal display panel 17 for narrowing the frame. . Therefore, the folding portion of the partition member can be fixed between the front bezel 18 and the resin frame 12 without separately providing an adhesive layer 16 for bonding them between the resin frame 12 and the reflection sheet 11. These members can be used efficiently. Further, as shown in FIG. 1, a fitting hole 19 that penetrates the front bezel 17, the reflection sheet 11, and the resin frame 12 is provided, and the front bezel 17, the reflection sheet 11 is formed with respect to the fitting hole 19. And by fitting the fitting member for fixing the resin frame 12, these members can be fixed to each other, and the effect of preventing the displacement of the reflective sheet 11 can be further enhanced.

As described above, according to the configuration of the liquid crystal display device of the first embodiment, an electrical short circuit between the front bezel 18 and the liquid crystal display panel 17 can be prevented and the frame can be narrowed very efficiently. It has a configuration. By such a device, it is possible to obtain a liquid crystal display device that is low in cost and highly effective without requiring a complicated manufacturing process.

(Embodiment 2)
FIG. 10 is a schematic cross-sectional view illustrating the configuration of the liquid crystal display device according to the second embodiment. The liquid crystal display device of the second embodiment is the same as the liquid crystal display device of the first embodiment except that a back bezel (outer frame member) 28 is disposed between the front bezel 18 and the folded portion of the reflection sheet 11. It has a configuration. The back bezel 28 is a member arranged so as to surround the back surface of the liquid crystal display panel 17 and the entire periphery of the reflection sheet 11, and serves to fix the back bezel 28 and other members constituting the liquid crystal display device. To fulfill. Therefore, as the back bezel 28, a material having high rigidity is preferably used, and it is preferable to use a conductive metal material such as stainless steel or aluminum. By providing the back bezel 28 as a fixing member in addition to the front bezel 18, a liquid crystal display device having a more robust external structure can be obtained. In the present embodiment, since the folded portion of the reflective sheet 11 having insulating properties is disposed between the back bezel 28 and the liquid crystal display panel 17, the conductive member 10 exposed from the back bezel 28 and the liquid crystal display panel 17 Can be prevented from being electrically short-circuited.

(Embodiment 3)
FIG. 11 is a schematic cross-sectional view illustrating the configuration of the liquid crystal display device according to the third embodiment. The liquid crystal display device of Embodiment 3 does not include a front bezel, and the reflective sheet 11 and the resin frame 12 are fixed to each other by the adhesive layer 26 beside the resin frame 12 and the adhesive layer 26 below the resin frame 12. Except for this, the liquid crystal display device of the first embodiment has the same configuration. As shown in FIG. 11, an adhesive layer 26 is provided on the side surface and the bottom surface of the resin frame 12. A material similar to that of the adhesive layer (RIM tape) 16 on the resin frame 12 can be used as the adhesive layer 26 beside and under the resin frame 12. The folded portion of the reflective sheet 11 is arranged along the side surface of the resin frame 12, and the folded portion of the reflective sheet 11 and the side surface of the resin frame 12 are fixed to each other using the adhesive layer 26, so that the reflective sheet 11 bends. Thus, the height enough to cover the side surface of the liquid crystal display panel 17 can be maintained. Thereby, it can prevent that the electrically-conductive member 10 exposed from the liquid crystal display panel 17 and the exterior are electrically short-circuited.

(Embodiment 4)
FIG. 12 is a schematic cross-sectional view illustrating the configuration of the liquid crystal display device according to the fourth embodiment. The liquid crystal display device of the fourth embodiment has the same configuration as the liquid crystal display device of the first embodiment, except that the height of the folded portion of the reflection sheet 11 does not reach the upper surface of the liquid crystal display panel 17. In the liquid crystal display device according to the fourth embodiment, the height of the folded portion of the reflection sheet 11 has a height that covers more than half of the side surface of the liquid crystal display panel, specifically about 75% of the side surface of the liquid crystal display panel. Has a height to cover. Here, “the height covering the side surface of the liquid crystal display panel” is a concept representing the distance from the lower surface of the lower glass substrate 22 to the upper surface of the upper glass substrate 21 of the pair of substrates constituting the liquid crystal display panel. It is. Since the folded portion of the reflection sheet has such a height, the side surface of the liquid crystal display panel is sufficiently covered, so that the conductive member 10 exposed from the liquid crystal display panel 17 and the front bezel 18 are electrically connected. A short circuit can be prevented.

1 is an exploded perspective schematic view of a liquid crystal display device of Embodiment 1. FIG. 1 is a schematic cross-sectional view illustrating a configuration of a liquid crystal display device according to Embodiment 1. FIG. It is a disassembled perspective schematic diagram of the liquid crystal display panel of Embodiment 1 in case a liquid crystal display panel has an active matrix type drive system. It is a disassembled perspective schematic diagram of the liquid crystal display panel of Embodiment 1 in case a liquid crystal display panel has a passive matrix type drive system. It is a schematic diagram which shows the shape of the reflective sheet in Embodiment 1, (a) is a development before folding, and (b) shows a perspective view after folding. It is a schematic diagram which shows the modification 1 of the shape of the reflective sheet in Embodiment 1, respectively, (a) is a development before folding, (b) shows the perspective view after folding. It is a schematic diagram which shows the modification 2 of the shape of the reflective sheet in Embodiment 1, respectively, (a) is a development before folding, (b) shows the perspective view after folding. It is a schematic diagram which shows the modification 3 of the shape of the reflective sheet in Embodiment 1, respectively, (a) is a development before folding, (b) shows the perspective view after folding. It is a schematic diagram which shows the modification 4 of the shape of the reflective sheet in Embodiment 1, respectively, (a) is a development before folding, (b) shows the perspective view after folding. 6 is a schematic cross-sectional view illustrating a configuration of a liquid crystal display device of Embodiment 2. FIG. 6 is a schematic cross-sectional view illustrating a configuration of a liquid crystal display device of Embodiment 3. FIG. 6 is a schematic cross-sectional view showing a configuration of a liquid crystal display device of Embodiment 4. FIG. It is a disassembled perspective schematic diagram of a general liquid crystal display device.

Explanation of symbols

10: Conductive members 11 and 111 exposed to the outside from the side surface of the liquid crystal display panel (for liquid crystal drive), 111: Reflective sheet (insulating sheet)
12: Resin frame (mounting table)
13, 113: Light guide plate 14, 114: Light source 15: Optical sheet 16, 26: Adhesive tape, RIM tape (adhesive layer)
17, 117: Liquid crystal display panels 18, 118: Front bezel (outer frame member)
19: Mating hole 21: Upper glass substrate 22: Lower glass substrate 28: Back bezel (outer frame member)
41: signal wiring 42: scanning wiring 43: pixel electrode 44: counter electrode 45: TFT
46: upper electrode 47: lower electrode 115a: diffusion plate 115b: prism sheet

Claims (11)

A display device comprising a display panel, a mounting table on which the display panel is mounted, and an insulating sheet disposed under the mounting table,
The display panel includes a conductive member exposed on a side surface of the display panel,
The display device, wherein at least one side of the insulating sheet is folded to cover a conductive member on a side surface of the display panel. The display device according to claim 1, wherein the insulating sheet has reflectivity. The display device according to claim 1, wherein the insulating sheet has a shape in which a cutout is provided in at least one corner of a rectangle. The display device according to claim 1, wherein the insulating sheet has a shape in which cutouts are provided at four corners of a rectangle. The display device according to claim 3, wherein a shape of the notch is a rectangle or a square. The display device according to claim 4, wherein the insulating sheet has a box shape formed by folding four sides. The display device according to claim 1, wherein the mounting table and the insulating sheet are fixed to each other by an adhesive layer beside the mounting table. The display device according to claim 1, wherein the mounting table and the insulating sheet are fixed to each other by an adhesive layer under the mounting table. The display device has an outer frame member surrounding the outer periphery of the insulating sheet,
The display device according to claim 1, wherein the insulating sheet is sandwiched between an outer frame member and a mounting table and fixed to each other. The outer frame member, the insulating sheet, and the mounting table have fitting holes at positions where they overlap each other,
The display device according to claim 9, wherein a fitting member is fitted in the fitting hole. The display panel includes a pair of substrates, and a liquid crystal layer sandwiched between the pair of substrates,
The display device according to claim 1, wherein the conductive member is a liquid crystal driving conductive member included in at least one of the pair of substrates.

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