JP2009086071A - Liquid crystal display module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reliable liquid crystal display module advantageous for compactifying and thinning application devices and preventing damage by static electricity without increasing cost. <P>SOLUTION: One end of a front glass substrate 11 positioned to the display observation side of a pair of glass substrates 11, 12 which have the liquid crystal of a liquid crystal display panel 1 therebetween is projected from the end face of the corresponding rear glass substrate 12. A driver chip 2 for driving the liquid crystal is COG (Chip On Glass)-mounted on the inner surface (liquid crystal placing surface) of the projection 111. A main FPC 3 is subjected to continuity junction to the end. The liquid crystal display panel 1 is fixed to a shield case 4 coated thereon by a pressure sensitive adhesive double coated sheet 5. The shielding case 4 is engaged to a light case 7 in which a plane light emission radiation panel 6 is housed and installed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a liquid crystal display module in which driver elements are mounted on COG (Chip On Glass).

  In recent years, liquid crystal display panels have been widely used as displays for mobile devices such as mobile phones and PDAs (Personal Digital Assistance) because of the advantage of being thin.

  Conventionally, as disclosed in Patent Document 1, a COG method in which a driver chip for driving a liquid crystal is directly mounted on a glass substrate is employed as a method for mounting a liquid crystal display panel.

  In a liquid crystal display module with a driver chip mounted on the COG, the driver chip and the outside of the module are only separated by a shield case, and this shield case is usually processed by processing a thin metal plate such as stainless steel. It is formed.

In this case, in order to prevent the driver chip from being broken by static electricity from the case plate side, as shown in FIG. 1 and FIG. The structure which sticks to the case inner side and prevents electrostatic destruction of a driver chip is employ | adopted.
JP 2006-235303 A

  However, the use of a shield case with an insulating sheet has a problem that the number of parts increases.

  An object of the present invention is to provide a liquid crystal display module that enables reduction in size and thickness of an applied device and is excellent in reliability.

  According to a first aspect of the present invention, there is provided a liquid crystal display module having a liquid crystal sandwiched between a pair of transparent substrates, wherein the display viewing side is the front side and one end of the front transparent substrate is the corresponding end of the rear transparent substrate. A liquid crystal display panel having a protruding portion protruding from the portion, a surface-emitting irradiation panel that is disposed on the back side of the liquid crystal display panel and irradiates light in a plane toward the liquid crystal display panel, and the front transparent Mounted on the liquid crystal sandwiching side surface of the protruding portion of the substrate, driving the liquid crystal by applying an electric field to the liquid crystal, electrically connected to the protruding portion, and folded back to the back side of the surface emitting irradiation panel It has a flexible wiring board for inputting a liquid crystal drive signal to the driver element, which has a length that can be connected.

  A liquid crystal display module according to claim 2 is the liquid crystal display module according to claim 1, wherein a display window for observing the display is provided, and at least a shield case made of a metal plate mounted on the liquid crystal display panel is provided. In addition, the liquid crystal display panel is fixed to the shield case.

  The liquid crystal display module according to claim 3 is the liquid crystal display module according to claim 1, wherein a frame for holding the liquid crystal display panel and the surface emitting irradiation panel in a predetermined position, and a rear side of the surface emitting irradiation panel. And the flexible wiring board is electrically connected to the drive control circuit board through a lower contact type connector.

  According to the liquid crystal display module to which the present invention is applied, miniaturization and thickness reduction can be achieved with a small number of components, and damage to electronic components such as driver chips due to static electricity can be prevented.

FIG. 1 is a schematic cross-sectional view showing a liquid crystal display module as one embodiment of the present invention.
The liquid crystal display panel 1 includes a pair of rectangular glass substrates 11 and 12 each having an electrode (not shown) formed on one main surface, and a frame-shaped sealing material (not shown) with the electrode forming surfaces facing each other. The liquid crystal (not shown) is sealed between the glass substrates 11 and 12 surrounded by a frame-shaped sealing material. Front and rear polarizing plates 13 and 14 are attached to the outer surfaces of the glass substrates 11 and 12, respectively.

  The front glass substrate 11 positioned on the display viewing side of the glass substrates 11 and 12 is formed with a protruding portion 111 by projecting one short edge outward from the corresponding end surface of the rear glass substrate 12. ing. On the inner surface (surface on the liquid crystal sandwiching side) of the projecting portion 111, lead wirings led out from the electrodes of both the substrates 11 and 12 are arranged, and the driver chip 2 as a driver element for driving the liquid crystal is COG (Chip On Glass). ) It is mounted directly by the method. In addition, each connection terminal (not shown) of the input wiring for the driver chip 2 is arranged in parallel at the end of the protruding portion 111. A main flexible wiring board (hereinafter referred to as FPC (Flexible Printed Circuit Board)) 3 for supplying drive control signals is conductively joined to the connection terminal row.

  A shield case 4 is mounted on the liquid crystal display panel 1 described above. The shield case 4 is formed into a case having an open bottom surface in which side plates 42 are erected on the four sides around a rectangular top plate 41 by processing a thin stainless steel plate into a metal plate. A display window 43 is formed corresponding to the display area of the liquid crystal display panel 1.

  A cutout portion 421 is formed in the side plate 42 corresponding to the end portion of the four side plates 42 to which the main FPC 3 of the liquid crystal display panel 1 to be accommodated is joined, and the main FPC 3 is connected to the case from the cutout portion 421. Pulled out.

  The liquid crystal display panel 1 is fixed by a double-sided pressure-sensitive adhesive sheet 5 while being accommodated in the shield case 4. The double-sided pressure-sensitive adhesive sheet 5 is formed in a rectangular frame shape surrounding the display area of the liquid crystal display panel 1, and is disposed on the periphery of the display window 43 on the inner surface of the top plate 41.

  A surface emitting irradiation panel 6 is installed on the back side opposite to the viewing side of the display of the liquid crystal display panel 1. In the surface emitting irradiation panel 6 of the present embodiment, an LED (Light-Emitting Diode) 62 as a light source element is provided at one end of a transparent light guide plate 61 having a rectangular shape substantially corresponding to the liquid crystal display panel 1 to be irradiated. A plurality of sidelight type backlight panels arranged.

  On the light emitting surface (front surface) 611 of the light guide plate 61, an optical sheet laminate 63 as a light control member is installed. The optical sheet laminate 63 is formed by sequentially laminating a lower diffusion sheet 631, a prism sheet 632, and an upper diffusion sheet 633 on the light emitting surface 611.

  On the rear surface 612 of the light guide plate 61, a concavo-convex pattern (not shown) is formed for uniformly reflecting the light emitted from the LEDs 62 and entering the light guide plate 61 toward the front surface 611. A light reflecting sheet 64 made of a white PET (polyethylene terephthalate) sheet is installed on the rear surface 612.

  The LED 62 is directly mounted on the FPC 65 by a COF (Chip On Film) method, and an FPC (hereinafter referred to as a light source FPC) 65 on which the LED 62 is mounted COF is disposed adjacent to the light reflection sheet 64.

  In the surface emitting irradiation panel 6 configured as described above, the light emitted from the LED 62 enters the light guide plate 61 from its opposite end surface, and this incident light enters the concave-convex pattern on the rear surface 612. Thus, the light is internally reflected toward the front surface 611 and emitted from the front surface 611 into a planar shape. The emitted light passes through the optical sheet laminate 63 and is irradiated onto the liquid crystal display panel 1 as planar irradiation light having a uniform luminance distribution and high front luminance. There is also light that exits from the light guide plate 61 after entering the concavo-convex pattern. However, the emitted light is reflected by the light reflecting sheet 64 and re-entered into the light guide plate 61, thereby causing the light from the LED 62 to be incident. The utilization efficiency of the emitted light is increased.

  The surface-emitting irradiation panel 6 is housed and installed in a light case 7. The light case 7 is an open top case whose outer shape formed using a resin material forms a rectangular parallelepiped, and the shield case 4 is fitted and mounted thereon. Accordingly, the four side plates 72 erected on the four sides of the rectangular bottom plate 71 substantially corresponding to the light guide plate 61 are respectively formed with recesses 721 for fitting the front end portions of the side plates 42 of the shield case 4. Has been. The light source FPC 65 is pulled out of the light case 7 from a notch (not shown) provided in the light case 7 and is conductively connected to a predetermined portion of the main FPC 3 joined to the liquid crystal display panel 1 described above. .

  If the shield case 4 in which the liquid crystal display panel 1 is accommodated is fitted and mounted on the light case 7 in which the surface emitting irradiation panel 6 is accommodated, the liquid crystal display module of this embodiment is obtained.

  When the device using the liquid crystal display module of the present embodiment as a display is, for example, a mobile phone, a PCB 8 for driving and controlling the liquid crystal display module is provided at the display installation position in the mobile phone. The PCB 8 is provided with a connector 9 for electrically connecting the main FPC 3, and the connector 9 for FPC connection is of a lower contact type as shown in FIGS. 2 (a) and 2 (b). Used.

  In this lower contact type connector 9, an actuator 94 is rotatably provided in a wiring insertion port 93 of a housing 92 that accommodates the connector 91, and the contact terminal portion 911 of the connector 91 is disposed below the insertion port 93 ( (When the actuator 94 side is upward).

   For wiring connection, first, the end portion of the main FPC 3 folded back to the back side of the liquid crystal display module as shown in FIG. 1 is left in the housing 92 with the actuator 94 opened as shown in FIG. Insert until the tip comes into contact with the back of the housing space. As a result, the wiring 31 forming surface of the main FPC 3 is arranged to face the contact terminal portion 911. After this, it is only necessary to close the insertion port by rotating the actuator 94. Thereby, as shown in (b), the reliable connection state in which the wiring 31 of the main FPC 3 is elastically contacted with the contact terminal portion 911 with sufficient pressure is obtained.

  As described above, in the liquid crystal display module of the present embodiment, the end portion of the front glass substrate 11 is protruded, and a connection terminal row for inputting a display drive signal is formed on the inner surface of the protrusion portion 111 to form the main FPC 3. Since the main FPC 3 is pulled out of the case and connected to the PCB 8 disposed on the back surface of the liquid crystal display module, the wiring forming surface is on the lower side (when the liquid crystal display module side is the upper side). Therefore, it is possible to connect the lower contact type connector 9 as it is without having to be folded back again in order to match the contact point. That is, the liquid crystal display module of the present embodiment does not require a minority type of upper contact type connector as a connector on the application device side, or does not need to fold the main FPC 3 to the lower contact type connector to match the contact. It is convenient for implementation.

  As described above, in the liquid crystal display module of the present embodiment, the driver chip 2 is COG-mounted on the inner surface (liquid crystal sandwiching side) of the front glass substrate 11 positioned on the display viewing side. Thus, electrostatic breakdown of the driver chip 2 is prevented. Therefore, it is not necessary to attach an insulating sheet for preventing electrostatic breakdown to the inner surface of the shield case in correspondence with the driver chip 2, and a liquid crystal display module excellent in reliability in which damage due to static electricity is prevented can be obtained by reducing the number of parts and the number of work steps. Can be manufactured without increasing

  Further, the liquid crystal display panel 1 and the shield case 4 are unitized by fixing the outer surface of the front glass substrate 11 on which the protruding portion 111 for mounting the driver chip 2 is formed to the shield case 4 by the double-sided adhesive sheet 5. The liquid crystal display panel 1 and the surface emission irradiation panel 6 can be predetermined without using a member holding means such as a frame by a simple work process in which the light emission irradiation panel 6 is unit bonded to the backlight unit housed in the lamp case 7. A liquid crystal display module that is accurately installed at the relative position of is obtained.

  Further, the main FPC 3 is long enough to be conductively joined to the front glass substrate 111, pulled out of the shield case 4 and folded back to the module back side, and the wiring formation surface at the folded tip is provided on the liquid crystal display module. Since it is located on the side opposite to the side (upper side) (lower side), it can be inserted into the lower contact type connector 9 of the applied device side PCB 8 installed on the back side of the module as it is for electrical connection. As a result, the present liquid crystal display module can be easily and reliably assembled to the application device without using a special and expensive upper contact type connector, and the application device can be reduced in size and thickness.

  Next, a liquid crystal display module as another embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected about the component same as the said embodiment, and the description is abbreviate | omitted.

  The liquid crystal display module of this embodiment includes a frame case 10 with an open top surface in which two rectangular parallelepiped storage spaces having different sizes are formed in two layers. The two storage spaces form a flat rectangular parallelepiped having a flat area smaller than the front chamber 10a of the flat rectangular parallelepiped with the viewing side of the opened display as the front side, and the area of the shelf 101. It consists of a rear chamber 10b of the space.

  In the front chamber 10a and the rear chamber 10b of the frame case 10, the same liquid crystal display panel 1 and surface emitting irradiation panel 6 as those of the above-described embodiment are housed and installed. A back cover plate 20 is fitted in a space formed on the back side of the rear chamber 10 b, and a drive control circuit board 30 is installed on the back cover plate 20. The drive control circuit board 30 controls the drive of the entire liquid crystal display module, and is electrically connected to the liquid crystal display panel 1 and the surface emitting backlight unit 6 by a main FPC 3 to which a light source FPC 65 is conductively connected.

  That is, the main FPC 3 is electrically connected to the end portion of the inner surface of the projection 111 of the front glass substrate 11 of the liquid crystal display panel 1 at the one end side of the main FPC 3, and from the notch 103 formed on the side plate 102 of the frame case 10 to the case. After being pulled out and extended downward along the outer surface of the side plate 102, it is folded back to the back side of the frame case 10, and the other end side connection terminal portion is inserted into the lower contact type connector 40 to drive the drive control circuit board 30 is electrically connected.

  The frame case 10 in which the liquid crystal display panel 1, the surface emitting irradiation panel 6 and the drive control circuit board 30 are housed and installed at predetermined positions is covered with a sheet metal cover case 50 in which a display window 501 is formed. Has been.

  As described above, the liquid crystal display module of this embodiment is prevented from being damaged by static electricity because the driver chip 2 is installed on the inner surface of the front glass substrate 111 as in the above embodiment, and the liquid crystal display panel 1 Since the surface emitting irradiation panel 6 is held at a predetermined position by the frame case 10, the relative positions of the panels 1 and 6 are accurately held over a long period of time, and good display quality is stably maintained.

In addition, this invention is not limited to said embodiment.
For example, in the above embodiment, the liquid crystal display panel is configured by sandwiching liquid crystal between a pair of glass substrates. However, the present invention is not limited to this, and the transparent substrate that sandwiches the liquid crystal is, for example, a transparent resin substrate other than the glass substrate. In some cases, the present invention can be applied effectively.

It is typical sectional drawing which shows the liquid crystal display module as one Embodiment of this invention. It is typical sectional drawing which shows the connector by which the said liquid crystal display module is electrically connected, (a) shows an open state, (b) has shown the closed state. It is typical sectional drawing which shows the liquid crystal display module as other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid crystal display panel 11, 12 Front, rear glass substrate 111 Protruding part 13, 14 Front, rear polarizing plate 2 Driver chip 3 Main FPC (Flexible Printed Circuit)
4 Shield Case 41 Top Plate 42 Side Plate 43 Display Window 5 Double-sided Adhesive Sheet 6 Surface Emitting Panel 61 Light Guide Plate 62 LED (Light-Emitting Diode)
63 Optical sheet laminate 64 Light reflecting sheet 65 Light source FPC
7 Light Case 8 Drive Control Circuit Board 9 Connector 91 Connector 92 Housing 93 Wiring Insertion Port 94 Actuator 10 Frame Case 20 Back Cover Plate 30 Drive Control Circuit Board 40 Connector

Claims (3)

A liquid crystal display panel comprising a protrusion sandwiched between a pair of transparent substrates, with the display viewing side as the front side and one end of the front transparent substrate protruding beyond the corresponding end of the rear transparent substrate; ,
A surface-emitting irradiation panel disposed on the back side of the liquid crystal display panel and emitting light in a plane toward the liquid crystal display panel;
A driver element that is mounted on the liquid crystal sandwiching side surface of the protrusion of the front transparent substrate and that drives and displays an electric field applied to the liquid crystal;
A flexible wiring board for inputting a liquid crystal driving signal to the driver element, the conductive wiring being connected to the projecting portion and having a length capable of being electrically connected by folding back to the back side of the surface emitting irradiation panel. LCD module.   A display window for observing the display is provided, and further includes a shield case made of at least a metal plate mounted on the liquid crystal display panel, and the liquid crystal display panel is fixed to the shield case. The liquid crystal display module according to claim 1.   A frame that holds the liquid crystal display panel and the surface-emitting irradiation panel in a predetermined position; and a drive control circuit board disposed on a back side of the surface-emitting irradiation panel; The liquid crystal display module according to claim 1, wherein the liquid crystal display module is electrically connected to the circuit board via a lower contact type connector.

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