JP2009205080A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that when a conductive tape is stuck onto a display device, it is needed to satisfactorily secure a sticking surface area and when a sticking surface area is not satisfactorily secured, peeling is caused by an environment resistance test to temperature, moisture and the like and peeling due to rebounding without following bending of a flexible board is also generated. <P>SOLUTION: In this liquid crystal display device, a liquid crystal panel and a metal component (a frame) are electrically connected to a circuit board via a GND substrate by providing an electrode on the GND substrate of a backlight unit instead of conventional conduction of the conductive tape. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an antistatic enhancement structure in an electronic device.

In conventional display devices, countermeasures against static electricity using conductive tape have been taken. In such a display device, an electronic component mounted on a circuit board and a conductive tape that connects a GND terminal provided on the circuit board are provided, and static electricity is transferred to the GND terminal on the circuit by the conductive tape. Conduction is made (see, for example, Patent Document 1).
JP 2006-236870 A

  When a conductive tape is pasted on the display device, it is necessary to secure a sufficient pasting area. When securing the affixing area is insufficient, peeling occurs due to an environmental resistance test such as temperature and humidity, and the bending of the flexible substrate cannot be followed, and peeling due to repulsion also occurs. For this reason, the applied static electricity route cannot be secured. In addition, it is necessary to reliably attach in the assembly process, and at the time of attachment, a cost for damage due to damage to the display panel (glass breakage, etc.) due to pressurization and a burden on the manufacturing process are applied.

  In order to solve the above problems, a liquid crystal display device according to the present invention includes a liquid crystal panel in which liquid crystal is sealed in a gap between an upper substrate and a lower substrate, a conductive layer provided on the upper surface of the upper substrate, and the liquid crystal A casing for housing a panel; a frame that covers the casing and that is connected to the conductive layer; and a GND substrate that is provided in the frame. The electrode provided on the GND substrate and the frame are electrically connected Decided to connect to.

  In addition, the liquid crystal display device includes a circuit board on which driving parts of the liquid crystal panel are mounted and connected to the liquid crystal panel, and the electrodes are electrically connected to the GND terminal of the circuit board.

  In the liquid crystal display device, the frame and the electrode are electrically connected by a conductive cushion.

  Charges charged on the surface of the liquid crystal panel can be released via the metal frame and the GND substrate. In addition, an anti-static structure that can follow the bending of the flexible substrate becomes possible.

  The liquid crystal display device of the present invention includes a conductive layer provided on the outer surface of the liquid crystal panel and a frame in contact with the conductive layer. The frame is formed so as to cover a casing that houses the liquid crystal panel, and a GND substrate is disposed in the frame. The electrode provided on the GND substrate and the frame are electrically connected. With such a configuration, charges charged on the surface of the liquid crystal panel can be released to the GND substrate via the frame.

  Embodiments relating to the display device of the present invention will be specifically described below with reference to the drawings.

  FIG. 1 schematically shows a schematic view of the display device of this example. The liquid crystal panel 10 is covered with an upper metal frame 9, and the circuit board 1 on which components for driving the liquid crystal panel are mounted is connected to the liquid crystal panel 10. FIG. 2 shows a cross section taken along the line AA ′ of FIG. As shown in the figure, the conductive layer 11 provided on the liquid crystal panel 10 is in contact with the upper metal frame 9. The liquid crystal panel 10 is housed in the casing 3, and a lower metal frame 7 is provided to hold the casing 3. An upper metal frame 9 is provided so as to cover the liquid crystal panel 10 and the casing 3, and the upper metal frame 9 is engaged with the lower metal frame 7. A conductive layer 11 is provided between the upper substrate 12 and the upper polarizing plate 14. The conductive layer 11 is in contact with the upper metal frame 9, and the upper metal frame 9 is mechanically fastened to the lower metal frame 7. An electrode 6 is provided on the GND substrate 4 fixed to the casing 3, and the lower metal frame 7 is electrically connected to the electrode 6 through a conductive cushion 8. Here, the liquid crystal panel 10 has a configuration in which liquid crystal is sealed between an upper substrate 12 and a lower substrate 13, and an upper polarizing plate 14 and a lower polarizing plate 15 are disposed so as to sandwich the liquid crystal panel 10.

  FIG. 3 is a rear view of the GND substrate. An LED element is mounted on the GND substrate 4 as a light source for illuminating the display panel. The GND substrate is provided with a terminal 5 and an electrode 6 which is a region for electrical connection with the lower metal frame 7, and the electrode 6 and the terminal 5 are electrically connected by wiring. By providing the conductive cushion 8 shown in FIG. 2 between the electrode 6 and the lower metal frame 7, the lower metal frame 7 and the terminal 5 of the GND substrate are electrically connected. The terminal 5 is electrically connected to a GND terminal 2 provided on the circuit board 1.

  Therefore, the conductive layer 11 on the liquid crystal panel comes into contact with the upper metal frame 9 and is electrically connected to the lower metal frame 7. Further, the lower metal frame 7 is electrically connected to the electrode 6 through the conductive cushion 8 and is electrically connected to the GND substrate 4. Since the electrode 6 provided on the GND substrate 4 and the GND terminal 5 are electrically connected to each other, the GND terminal 5 is electrically connected to the GND terminal 2 provided on the circuit board 1, so that the GND substrate 4 is Conductive with the circuit board 1.

  According to the above-mentioned form, the electric charge charged on the surface of the liquid crystal panel 10 is electrically transmitted by the GND terminal 5 and the GND terminal 2 through the electrode 6 connected to the lower metal frame 7 from the conductive layer 11 and the GND substrate 4. Can be discharged to the connected circuit board 1.

  Here, although the conductive layer 11 is provided between the upper polarizing plate 14 and the upper glass substrate 12, the same effect can be obtained by providing a polarizing plate with a conductive layer on the upper surface of the upper glass substrate.

  Further, in this embodiment, in order to electrically connect the lower metal frame 7 and the GND substrate 4, an electrode 6 is provided on the GND substrate 4, and further conductive between the lower metal frame 7 and the electrode 6 of the GND substrate 4. Although the conductive cushion 8 is installed, it can be directly connected without using the conductive cushion 8. For example, the same effect can be obtained even if the lower metal frame 7 is processed into a shape that directly contacts the electrode 6 and is electrically connected.

  It is possible to create an optimum anti-static structure that meets the needs of individual cases without being affected by the bending of the flexible substrate. In addition, since it can be performed easily, inexpensively and in a short period of time as compared with the conductive tape, it is suitable for use in the electronic equipment industry where the delivery time is shortened and the cost is reduced.

It is the front schematic of the display apparatus used for this invention. It is sectional drawing of the display apparatus used for this invention. It is a back surface schematic diagram of the LED board used for this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Circuit board 2 GND terminal 3 Casing 4 GND board 5 Terminal 6 Electrode 7 Lower metal frame 8 Conductive cushion 9 Upper metal frame 10 Liquid crystal panel 11 Conductive layer 12 Upper glass substrate 13 Lower glass substrate 14 Upper polarizing plate 15 Lower polarizing plate

Claims (3)

A liquid crystal panel in which liquid crystal is sealed in the gap between the upper substrate and the lower substrate;
A conductive layer provided on the upper surface of the upper substrate;
A casing for housing the liquid crystal panel;
A frame that covers the casing and contacts the conductive layer;
A GND substrate provided in the frame,
A liquid crystal display device, wherein an electrode provided on the GND substrate and the frame are electrically connected.   2. The liquid crystal according to claim 1, wherein the liquid crystal panel driving component is mounted, the circuit board is connected to the liquid crystal panel, and the electrode is electrically connected to a GND terminal of the circuit board. Display device.   The liquid crystal display device according to claim 1, wherein the frame and the electrode are electrically connected by a conductive cushion.

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