JP4759965B2 - Liquid crystal display - Google Patents

Description

  The present invention relates to a liquid crystal display device capable of performing double-sided irradiation with a single backlight unit.

  In recent years, mobile phones, PDAs, or portable information terminals that have a telephone function and can display more messages have been commercialized and widely spread. Among these devices, in particular, the mobile phone is connected to the Internet in addition to the telephone function for exchanging the original conversation, and various functions such as e-mail, information retrieval, or map display and destination guidance are provided. It is equipped with various functions such as navigation, and more software will be installed in the future.

  As such various kinds of software are installed in mobile phones, the phone itself, so-called hardware, is pursued to be more convenient, lighter and more portable, and various types are developed and commercialized. ing.

  This mobile phone type is roughly classified into a bar type and a foldable type, and recently, the liquid crystal display panel can be turned upside down so that the incoming party can be confirmed while folded and the time and the like are displayed. Many of the latter foldable types that have been incorporated into places have become widespread.

  5A and 5B are diagrams showing a conventional foldable mobile phone, in which FIG. 5A is a perspective view seen from one side with the phone open, and FIG. 5B is a perspective view seen from the other side.

  As shown in FIGS. 5 (A) and 5 (B), the foldable mobile phone 50 normally has an upper housing 51 and a lower housing 52 connected to each other by a hinge mechanism 53 so as to be freely opened and closed. A double-sided liquid crystal display panel is provided, and the operation surface 52a of the lower housing 52 has a configuration in which an input keyboard 52b for performing dial operation or the like is provided.

  This double-sided light-emitting type liquid crystal display panel includes a main liquid crystal display panel 51a whose main display surface is exposed on the operation surface side and an auxiliary liquid crystal display panel 51b exposed on the exterior surface side.

  According to the mobile phone 50 equipped with this liquid crystal display panel, even when the housings 51 and 52 are folded by the hinge mechanism 53, the auxiliary liquid crystal display panel 51b is located on the exterior side of the upper housing 51. Various information can be confirmed from the auxiliary display surface without opening the housings 51 and 52.

  FIG. 6 is a side view schematically showing a known liquid crystal display panel used in this type of foldable mobile phone.

  The liquid crystal display panel 60 includes a main liquid crystal display panel 61 serving as a main display surface and an auxiliary liquid crystal display panel 62 serving as an auxiliary display surface. The main liquid crystal display panel 61 includes a transflective liquid crystal display panel 61a, The main backlight 61b irradiates the liquid crystal display panel 61a. The main backlight 61b includes a light source 61c and a light guide plate 61d.

  The auxiliary liquid crystal display panel 62 includes a transflective liquid crystal display panel 62a that is smaller than the main liquid crystal display panel 61, and an auxiliary backlight 62b that irradiates the liquid crystal display panel 62a. The auxiliary backlight 62b is a light source. 62c and a light guide plate 62d.

  However, since this liquid crystal display panel 60 requires a main backlight 61b and an auxiliary backlight 62b for the main and auxiliary liquid crystal display panels 61 and 62, respectively, a light source 61c and 62c is required for each backlight. As a result, the mobile phone itself tends to be large and have a large number of parts. In order to solve such a problem, a double-sided liquid crystal display device capable of irradiating two liquid crystal display panels with a set of backlight units is also introduced in the patent literature. (For example, refer to Patent Document 1 below).

  FIG. 7 is an exploded perspective view of a double-sided liquid crystal display device described in Patent Document 1 below. As shown in this figure, the double-sided liquid crystal display device includes an inner liquid crystal display panel 71, that is, a main liquid crystal display panel, a holder 72 that accommodates the main liquid crystal display panel 71, a backlight unit 73, and an outer liquid crystal display panel. 76, that is, an auxiliary liquid crystal display panel, and the backlight unit 73 includes a light guide plate 75 and a flexible substrate 74.

The backlight unit 73 is assembled as follows. First, the light guide plate 75 is inserted inside the holder 72, and the liquid crystal display panel 71 is attached to the bottom surface of the light guide plate 75. A flexible substrate 74 is disposed above the light guide plate 75, and the outer liquid crystal display panel 76 is fixed to the holder 72 by a frame 77 on the flexible substrate 74. Further, a light emission source LED 74 a is fixed to one side surface of the flexible substrate 74.
JP 2002-287144 A (FIG. 4, paragraphs [0025] to [0030])

  However, the known liquid crystal display panel 60 requires two sets of backlight units of a main backlight 61b and an auxiliary backlight 62b, so that the number of parts is large, the cost is high, and the assembly work is troublesome. There is a problem that the thickness of the product increases.

  In this regard, the double-sided liquid crystal display device described in Patent Document 1 does not need to provide another backlight unit because the two main auxiliary liquid crystal display panels share one backlight unit.

  However, this double-sided light emitting liquid crystal display device has a structure in which the inner and outer liquid crystal display panels are arranged on the front and back of the light guide plate and are supported by the light guide plate, so that the light guide plate has a certain degree of mechanical strength. The light guide plate cannot be made thin. On the other hand, since this light guide plate is only accommodated in the holder, it is difficult to maintain sufficient mechanical strength. Furthermore, a frame is required to fix the outer liquid crystal display panel, and the number of parts increases. As a result, it is difficult to reduce the thickness of the liquid crystal display panel.

  In addition, since this double-sided light emitting liquid crystal display device does not take measures against noise, there is a problem that the device must take measures against noise when used in a mobile phone or the like.

  Accordingly, the present invention has been made to solve the above-described problems of the prior art, and the object of the present invention is to realize a thin shape while maintaining a predetermined mechanical strength and to simplify the assembly. An object of the present invention is to provide a liquid crystal display device provided with a double-sided light emitting plate and a portable information terminal equipped with the liquid crystal display device.

  In order to achieve the above object, a liquid crystal display device according to claim 1 of the present invention includes a first liquid crystal display panel on one surface of a light guide plate that guides light to both the front and back surfaces, and the first liquid crystal display panel on the other surface. In a liquid crystal display device in which a second liquid crystal display panel having a smaller size is arranged and stacked, the liquid crystal display device has approximately the same size as the light guide plate between the light guide plate and the second liquid crystal display panel. A thin plate-like reinforcing frame having an opening of approximately the same size as the display surface of the second liquid crystal display panel is interposed, covered with a cover having an opening corresponding to the display surface of the second liquid crystal display panel, and the reinforcing frame and the cover The second liquid crystal display panel is sandwiched and fixed.

  According to a second aspect of the present invention, there is provided the liquid crystal display device according to the first aspect, wherein the reinforcing frame is formed of a metal member.

  According to a third aspect of the present invention, in the liquid crystal display device according to the first or second aspect, a circuit in which a semiconductor element or the like for driving the liquid crystal display panel is mounted between the reinforcing frame and the cover. A substrate is provided.

  According to a fourth aspect of the present invention, there is provided the liquid crystal display device according to the first aspect, further comprising a frame-shaped frame body having a size that can accommodate the light guide plate and the like. And a light source for irradiating light to one end of the light guide plate, and the first liquid crystal display panel.

 According to the present invention, the above-described means provides the following excellent effects. That is, according to the first and second aspects of the invention, the first and second liquid crystal display panels are formed by laminating the first liquid crystal display panel, the light guide plate and the second liquid crystal display panel with the thin plate-like reinforcing frame interposed. Even if the light guide plate is made thin, it can be supported while being mechanically reinforced with this reinforcing frame. Therefore, even if a reinforcing frame is added, the thickness of the light guide plate and the first and second liquid crystal display panels can be reduced. As a result, the liquid crystal display device can be thinned.

  In addition, since the second LCD panel can be fixed by being sandwiched between the reinforcing frame and the cover, there is no need for a fixing frame for fixing the second LCD panel required in the prior art, the number of parts can be reduced, and the assembly work is easy. become.

  According to the invention of claim 3, since the circuit board is disposed between the reinforcing frame and the cover, the wiring and elements mounted on the circuit board are covered with the cover. It is possible to protect from contact with the other. In addition, by forming the reinforcing frame and the cover with a metal member, a good electrical connection with the circuit board becomes possible. Furthermore, since the circuit board and the like can be protected by attaching an insulating material to the inner surface of the cover, it is possible to reduce electromagnetic interference.

  In addition, the circuit board is provided with an opening large enough to penetrate the display surface of the second liquid crystal display panel, and is disposed between the reinforcing frame and the cover, so that the circuit board can be positioned and fixed effectively using a narrow space. In addition, wiring, semiconductor elements, and the like can be attached to the periphery of the opening.

  Furthermore, the circuit board is affixed to the reinforcing frame, so that the circuit board is stably fixed and the circuit board does not move due to vibration or the like, poor contact of semiconductor elements, wiring, etc. mounted on the board. No circuit failure will occur.

  According to the fourth aspect of the present invention, the light guide plate and the first liquid crystal display panel are fitted into the frame-like frame body, so that a member for fixing the first liquid crystal display panel is unnecessary and the assembly of the liquid crystal display panel is easy. In addition, the mechanical strength can be increased.

  Hereinafter, the best embodiment of the present invention will be described with reference to the drawings. However, the embodiment described below exemplifies a liquid crystal display device for embodying the technical idea of the present invention and a portable information terminal equipped with the liquid crystal display device. It is not intended to be specified as a portable information terminal provided with this liquid crystal display device, and other embodiments included in the scope of the claims are equally applicable.

  1 is an exploded perspective view of a liquid crystal display device according to one embodiment of the present invention, FIG. 2 shows an assembly of the liquid crystal display device of FIG. 1, FIG. 2 (a) is a plan view, and FIG. 2 (b). Is a cross-sectional view taken along line AA in FIG. 2A, FIG. 3 shows a circuit board mounted on the liquid crystal display device of the present invention, FIG. 3A is a front perspective view, and FIG. FIG. 4 shows a sheet metal frame mounted on the liquid crystal display device of the present invention, FIG. 4 (a) is a front perspective view, and FIG. 4 (b) is a rear perspective view.

  The present invention is a liquid crystal display device provided with a double-sided light-emitting type light guide plate. The liquid crystal display device 10 is arranged on the light guide plate 11 for guiding light to both the front and back surfaces, and on the surface 11a side of the light guide plate 11. A first liquid crystal display panel 15 provided, and a second liquid crystal display panel 30 that is smaller than the first liquid crystal display panel 15 disposed on the back surface 11b side of the light guide plate 11, and on the back surface 11b of the light guide plate 11, A thin plate-like sheet metal frame 25 having an opening 26 having substantially the same size as the light guide plate 11 and having the same size as the display surface of the second liquid crystal display panel 30 is brought into contact with the first liquid crystal display panel 15 and the conductive plate. The light plate 11 and the second liquid crystal display panel 30 are laminated, the laminated body is covered with a cover 40, and a fixed configuration is made such that the surface of the second liquid crystal display panel 30 is exposed from an opening 42 provided in the cover 40. Have.

  As shown in FIGS. 1 and 2, the light guide plate 11 is formed of a thin plate-like body, introduces light emitted from the light source 14 into the inside from one end portion 11 c thereof, and is on the surface 11 a side (first side) of the light guide plate 11. The liquid crystal display panel 15 side) and the back surface 11b side (second liquid crystal display panel 30 side) are led out and formed of a transparent material. As the transparent material, for example, an acrylic resin material is used. Further, the thickness is preferably about 0.6 mm, and the light guide plate 11 is fitted into the frame-like frame body 12.

  As shown in FIGS. 1 and 2B, the frame-like frame body 12 into which the light guide plate 11 is fitted is composed of frame pieces 12 a to 12 d having a rectangular shape and a predetermined width and height. The liquid crystal display panel 15, the light guide plate 11, the optical sheets 17a and 17b, and the light source 14 are large enough to be accommodated.

  Among these frame pieces 12a to 12d, when opposing long side frame pieces 12c and 12d are extended longer than the light guide plate 11, the frame piece 12a is provided at the tip thereof, and when the light guide plate 11 is fitted into the frame body 12, A gap 12a ′ is formed between the frame piece 12a and the light guide plate 11. The light source 14 is inserted into the gap 12a 'when the liquid crystal display panel is assembled.

  The first liquid crystal display panel 15, the optical sheets 17 a and 17 b, and the light guide plate 11 are fitted into the frame-shaped frame body 12. By fitting each component into the frame body 12 in this way, one assembly is formed. Therefore, the assembly of the liquid crystal display panel in the next process is simplified. Further, a member for fixing the first liquid crystal display panel 15 is not required, the assembly of the liquid crystal display panel is simplified, and the mechanical strength can be increased.

  The light source 14 is provided with a plurality of LEDs (Light Emitting Diodes) 13a arranged in a line on an elongated substrate 13, and power is supplied through a wiring 13b connected to the substrate. Although the light source has been described as an LED here, the present invention is not limited to this, and for example, a fluorescent lamp or the like may be used.

  As the first liquid crystal display panel 15, a transflective liquid crystal display panel is used. As shown in FIG. 2B, the liquid crystal display panel 15 includes a liquid crystal 15c enclosed between two first and second substrates 15a and 15b made of opposing glass via a sealing material. It has a bonded structure. Of the substrates 15a and 15b, the second substrate 15b is longer than the first substrate 15a so that the end of the second substrate 15b protrudes from the edge of the first substrate 15a when the substrates are bonded together. To do. And the light source 14 is affixed on the back surface of this protrusion part 15b '. Note that the transflective liquid crystal display panel used here is a known one and will not be described in detail.

  Further, deflecting plates 16a and 16b are disposed on the front and back surfaces of the first liquid crystal display panel 15, respectively. Between the liquid crystal display panel 15 and the light guide plate 11, an optical made of a light diffusion sheet, a prism sheet or the like is provided. A sheet 17a is provided.

  The first liquid crystal display panel 15 has a circuit board 18 connected to one end thereof. The circuit board 18 has a graphic controller, a light source (LED) driver, a semiconductor element for driving liquid crystal, and the like mounted on a flexible printed circuit (FPC). As shown in FIG. 2, the control board 19 has approximately the same size as the first liquid crystal display panel 15 and a connection portion 20 that connects the control board 19 and the first liquid crystal display panel 15. In addition, the circuit board 18 can be folded from the connecting portion 20 during assembly.

  A plurality of ground contact portions 22b are provided on the surface 19b of the circuit board 18 (see FIG. 3A), that is, the surface that contacts the back surface 25b of the sheet metal frame 25 (see FIG. 4B). These ground contact portions 22b are provided near the outer periphery of the substrate.

  On the back surface 19a of the circuit board 18, a semiconductor element 23a for driving liquid crystal, a connector 23b for connecting an external circuit, and the like are attached around the opening 21, and a plurality of ground contact portions 22a are provided. These ground contact portions 22a are connected to the ground contact portions 22b on the substrate surface, and these ground contact portions 22a and 22b are formed by applying a conductive adhesive or applying a conductive adhesive tape. Is done.

  The second liquid crystal display panel 30 is the same transflective liquid crystal display panel as the first liquid crystal display panel 15. The second liquid crystal display panel 30 is configured by joining and integrating a first substrate 30a and a second substrate 30b made of glass facing each other with a liquid crystal layer interposed therebetween with a sealing material, and the second substrate 30b serves as a display surface. ing.

  A flexible circuit board 31 is connected to the liquid crystal display panel 30, and the other end of the board 31 is connected to the circuit board 18 through a connector.

  The sheet metal frame 25 has substantially the same size as the frame-like frame body 12, and has an opening 26 having the same size as the display surface of the second liquid crystal display panel 30 on its surface and a plurality of edges on the outer peripheral edge. And is formed of a thin metal member such as aluminum, and the plate thickness is preferably about 0.2 mm.

  The sheet metal frame 25 is affixed with a black tape on one surface 25a thereof, that is, around the opening 26 on the surface in contact with the light guide plate 11, for the purpose of preventing light leakage.

  Further, on the other surface 25b of the sheet metal frame 25, that is, the surface on which the second liquid crystal display panel 30 is mounted, a plurality of projecting pieces 29a, 29b, 29c projecting from the surface are provided on the three sides of the opening 26. It is formed. These projecting pieces 29 a, 29 b and 29 c are in contact with the outer peripheral surface of the second liquid crystal display panel 30 and position the second liquid crystal display panel 30. The second liquid crystal display panel 30 and the optical sheet (not shown) provided on the back surface of the second liquid crystal display panel 30 are fixed by these protrusions 29a, 29b, 29c and a cover 40 described later. That is, the second liquid crystal display panel 30 and the optical sheet provided on the back surface of the second liquid crystal display panel 30 are positioned on three sides of the protrusions 29a, 29b, and 29c, covered with the cover 40, and provided on the cover 40. The outer periphery of the panel 30 is pressed and fixed around the opening 42. According to this method, a dedicated frame for fixing the panel 30 and the like is not necessary, and the assembling work is simplified.

  As shown in FIG. 4B, the back surface 25b of the sheet metal frame 25 is formed with a plurality of ground contact portions 25b ′ at the outer peripheral end portion, and double-sided adhesive is applied to the portion excluding the electrode 25b ′ and the opening 26. Tape T is affixed. Each ground contact portion 25b 'is formed by applying a conductive adhesive or applying a conductive adhesive tape.

  When the double-sided adhesive tape T is affixed to the surface 25b of the sheet metal frame 25 and the conductive adhesive is applied to the ground contact portion 25b ', the circuit board 18 is placed on one side of the double-sided adhesive tape T when the liquid crystal display panel is assembled. At the same time, the ground contact portion 22b of the circuit board 18 is attached to the conductive adhesive.

  Accordingly, the circuit board 18 is firmly fixed to the sheet metal frame 25, and the ground contact portions 22b and 25b 'are securely connected.

  By using the sheet metal frame 25 made of a metal member in this manner, a predetermined mechanical strength is maintained, and the sheet metal frame 25 can be supported while being mechanically reinforced by bringing the sheet metal frame 25 into contact with the light guide plate. Since the sheet metal frame 25 is formed of a metal member or the like, it can maintain a predetermined mechanical strength even if it is thin. Therefore, if the thickness of the light guide plate 11 and the first and second liquid crystal display panels is reduced, the sheet metal frame 25 as a whole. The liquid crystal display panel 10 can be thinned. Further, by contacting the optical sheet 17b interposed between the frame 25 and the light guide plate 11, the optical sheet has a function of extending the wrinkles and preventing wrinkles. Furthermore, since the sheet metal frame 25 is a conductor, a good electrical connection circuit can be formed between the circuit board 18 and a cover 40 described later, and an earth connection can be made through this circuit connection.

  The sheet metal frame 25 is not limited to a metal member, and may be a sheet material made of a resin material having a predetermined strength.

  As shown in FIGS. 1 and 2, the cover 40 is formed from the second liquid crystal display panel 30 side after the first liquid crystal display panel 15, the light guide plate 11, the sheet metal frame 25, the second liquid crystal display panel 30, and the like are laminated. It is a cover that covers this laminate, and has a box shape having shallow side plates 41a to 41d on the outer periphery with a shallow bottom, and an opening 42 having a size that exposes the display surface of the second liquid crystal display panel 30 to the bottom plate 41f. And a plurality of openings 43 through which the connector 23b provided on the circuit board 18 is exposed, and is formed of a metal member. The bottom plate 41f preferably protrudes inward from the portion of the circuit board 18 that contacts the ground contact portion 22a to form a protrusion (not shown), and makes good contact with the ground contact portion 22a during assembly. . The metal member is preferably a stainless material, but is not limited to the stainless material, and may be another metal member or a resin material.

  The assembly of the liquid crystal display device provided with the double-sided light emitting type light guide plate will be described below.

  First, the light guide plate 11 is fitted into the frame-shaped frame body 12, and one or a plurality of optical sheets 17a are placed on one surface 11a of the fitted light guide plate, and a first liquid crystal display is formed from above the optical sheet 17a. The panel 15 is fitted into the frame body 12. Similarly, the other surface 11b of the light guide plate 11 has one or more optical sheets 17b mounted thereon, and has an opening for exposing the display surface of the second liquid crystal display panel 30 on the optical sheet 17b. A light shielding sheet (not shown) is attached.

  This light shielding sheet shields light from the light guide plate 11 from being irradiated to the outer periphery of the small-sized second liquid crystal display panel 30. In addition, by fitting the first liquid crystal display panel 15, the optical sheets 17a and 17b, and the light guide plate 11 in the frame-shaped frame 12, these components are accommodated in the frame 12 to form one assembly. This simplifies the assembly of the liquid crystal display panel in the next process. In addition, a member for fixing the first liquid crystal display panel is unnecessary, the assembly of the liquid crystal display panel is simplified, and the mechanical strength can be increased.

  Next, the sheet metal frame 25 is brought into contact with the back surface of the light shielding sheet of the assembly, and the locking piece 27a of the sheet metal frame is engaged with the locking protrusion 12e of the frame body 12 and fixed.

  In addition, a double-sided adhesive tape T is previously applied to the sheet metal frame 25, and a conductive adhesive is applied to the ground contact portion 25b ′, and between the protrusions 29a to 29c around the opening 26. The second liquid crystal display panel 30 is sandwiched.

  Thereafter, the circuit board 18 is affixed to one surface of the double-sided adhesive tape T, and the ground contact portion 22b of the circuit board 18 is electrically connected to the ground contact portion 25b ′ of the sheet metal frame 25 via a conductive adhesive. To do.

  The assembly assembled in this manner is covered with a metal cover 40 from the second liquid crystal display panel 30 side, and the locking holes 41e of the cover are locked to the locking projections 12f of the frame body 12, so The liquid crystal display device 10 provided with the light plate is assembled. By covering the assembly with the cover 40 as described above, the connector 23b of the circuit board 18 is exposed from the opening provided in the cover 40, and connection to other devices is performed through the connector 23b.

  The liquid crystal display device thus assembled is mounted on a mobile phone as shown in FIG. 5, but the liquid crystal display device 10 of the present invention is thinned by the above-described configuration. Mobile phones equipped with 10 can also be made thinner. However, the device on which the liquid crystal display device 10 is mounted is not limited to a mobile phone, and can be mounted on other mobile information terminals such as a PDA.

FIG. 1 is an exploded perspective view of a liquid crystal display device according to an embodiment of the present invention. 2 shows the assembly of the liquid crystal display device of FIG. 1, FIG. 2 (a) is a plan view, and FIG. 2 (b) is a cross-sectional view taken along line AA of FIG. 2 (a). 3 shows a circuit board mounted on the liquid crystal display device of the present invention. FIG. 3 (a) is a front perspective view, and FIG. 3 (b) is a rear perspective view. FIG. 4 shows a sheet metal frame mounted on the liquid crystal display device of the present invention, FIG. 4 (a) is a front perspective view, and FIG. 4 (b) is a rear perspective view. 5A and 5B are diagrams showing a conventional foldable mobile phone, FIG. 5A is a perspective view seen from one side with the phone open, and FIG. 5B is a perspective view seen from the other side. FIG. 6 is a side view schematically showing a known liquid crystal display panel used for this type of folding cellular phone. FIG. 7 is an exploded perspective view of a conventional double-sided liquid crystal display device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Liquid crystal display device 11 Light guide plate 12 Frame 14 Light source 15 1st liquid crystal display panel 18 Circuit board 25 Sheet metal frame (reinforcement frame)
30 Second liquid crystal display panel 40 Cover

Claims (2)

In the liquid crystal display device in which the first liquid crystal display panel is disposed on one surface of the light guide plate that guides light to both the front and back surfaces, and the second liquid crystal display panel that is smaller than the first liquid crystal display panel is disposed on the other surface.
Between the light guide plate and the second liquid crystal display panel, a thin plate shape having a first opening having substantially the same size as the light guide plate and substantially the same size as the display surface of the second liquid crystal display panel. And a circuit board for controlling the first liquid crystal display panel and the second liquid crystal display panel are interposed,
The reinforcing frame is disposed between the light guide plate and the circuit board,
The circuit board has a second opening corresponding to a display surface of the second liquid crystal display panel;
The second liquid crystal display panel is disposed in the second opening;
A ground contact portion is formed on each of the circuit board surface on the light guide plate side and the second liquid crystal panel side back surface, and the ground contact portion provided on the surface of the circuit board. And the ground contact portion provided on the back surface of the circuit board are connected,
A part of the reinforcing frame is disposed to face at least a region of the surface of the circuit board where the ground contact portion is disposed,
The ground contact portion provided on the surface of the circuit board is disposed in contact with the reinforcing frame,
On the back side of the circuit board, there is a rectangular bottom plate and a side plate having a predetermined height provided on the outer periphery of the bottom plate. The light guide plate, the first liquid crystal display panel, and the second liquid crystal display panel are provided. At least a portion of the cover provided to cover the laminate including,
A conductive adhesive is applied to a region of the reinforcing frame that faces the ground contact portion provided on the surface of the circuit board.
The ground contact portion provided on the surface of the circuit board is connected to the reinforcing frame via the conductive adhesive,
A double-sided adhesive tape is affixed to a region of the reinforcing frame that is out of the region facing the ground contact portion provided on the surface of the circuit board,
The circuit board is affixed to the double-sided adhesive tape,
The cover has a third opening corresponding to the display surface of the second liquid crystal display panel;
A part of the bottom plate of the cover is disposed to face a region where the ground contact portion on the back surface of the circuit board is formed, and toward the ground contact portion on the back surface of the circuit board. Having a protrusion formed to protrude;
The protrusion is made of metal,
The ground contact portion provided on the back surface of the circuit board is disposed in contact with the protrusion ,
The second liquid crystal display panel is sandwiched between a plurality of projecting pieces provided around the first opening of the reinforcing frame, and an outer periphery of the second liquid crystal display panel is the third opening of the cover. A liquid crystal display device characterized by being fixed in a state where it is pressed against the periphery of the liquid crystal display. The frame includes a frame-shaped frame that can be accommodated by the light guide plate. The frame includes the light guide plate, a light source that emits light to one end of the light guide plate, and the first liquid crystal display panel. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is fitted.

Images