Patent Application
20070146570
The present invention relates to a liquid crystal display which includes a flexible printed circuit and a metal frame, the flexible printed circuit having a grounding member, and the metal frame having a holding member for holding the grounding member.
A typical liquid crystal display is capable of displaying a clear and sharp image through thousands or even millions of pixels that make up the complete image. The liquid crystal display has thus been applied to various electronic equipment in which messages or pictures need to be displayed, such as mobile phones and notebook computers. However, liquid crystal in the liquid crystal display does not itself emit light. Rather, the liquid crystal has to be lit up by a light source so as to clearly and sharply display text and images. The light source may be ambient light, or a backlight module attached to the liquid crystal display.
Referring to
The FPC 13 includes a grounding member 133. The grounding member 133 has a plurality of ends of grounding wires (not shown) of the FPC 13 gathered thereon. When the liquid crystal display 10 is assembled, the FPC 13 is bent to attach on a back side (not labeled) of the metal frame 18 of the backlight module 15. The grounding member 133 of the FPC 13 is pasted on the metal frame 18 by a conductive film 19 such that the grounding member 133 is grounded via the metal frame 18. Thus, electromagnetic interference (EMI) of the liquid crystal display 10 is eliminated.
However, the adhesive strength of the conductive film 19 is prone to wane over time. In addition, parts of the conductive film 19 are liable to be chipped off or break off, particular if the liquid crystal display 10 is jarred and if the conductive film 19 is aged. For these kinds of reasons, the resistance between the FPC 13 and the metal frame 18 may be unduly increased, and the capability of the liquid crystal display 10 to resist EMI may be diminished. If the liquid crystal display 10 is prone to EMI, it may not operate reliably.
Therefore, a new liquid crystal display that can overcome the above-described problems is desired.
In one preferred embodiment, a liquid crystal display includes a liquid crystal panel, a flexible printed circuit connected to the liquid crystal panel, and a backlight module configured for illuminating the liquid crystal panel. The flexible printed circuit includes a first grounding member. The backlight module includes a metal frame. The metal frame includes a first holding member. The first holding member of the metal frame holds the first grounding member of the flexible printed circuit such that the first grounding member is electrically. connected with the metal frame.
Other advantages and novel features will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings. In the drawings, all the views are schematic.
Referring to
The FPC 23 includes two extending portions 230, two first grounding members 231, and two second grounding members 233. The extending portions 230 outwardly extend from two opposite free edges (not labeled) of the FPC 23, respectively. The first grounding members 231 are located at free ends of the extending portions 230, respectively. The second grounding members 233 are respectively located at the two opposite free edges of the FPC 23, and are distal from the extending portions 230. Each of the first and second grounding members 231, 233 has a plurality of ends of grounding wires (not shown) of the FPC 23 gathered thereon.
The metal frame 28 includes a bottom plate 285, two opposite sidewalls 286, two first holding members 281, and two second holding members 283. The sidewalls 286 are substantially perpendicularly connected with the bottom plate 285. The first holding members 281 comprise slender notches respectively defined at two junctions (not labeled) between the sidewalls 286 and the bottom plate 285. The first holding members 281 respectively correspond to the extending portions 230 of the FPC 23. The second holding members 283 are respectively defined at two opposite edges of the bottom plate 285 adjacent the sidewalls 286, and correspond to the second grounding members 233 of the FPC 23. Each of the second holding members 283 includes a U-shaped slot 287, and a rectangular elastic tab 288 formed as a result of the formation of the U-shaped slot 287.
When the liquid crystal display 20 is assembled, the FPC 23 is attached to the bottom plate 285 of the metal frame 28. The extending portions 230 are received in the first holding members 281 after being bent. The first grounding members 231 contact the metal frame 28 due to the resilience force of the extending portions 230, thus achieving grounding. The second grounding members 233 are inserted beneath the elastic tabs 288, and contact the elastic tabs 288 of the metal frame 28, thus achieving grounding.
In summary, the grounding members 231, 233 of the FPC 23 respectively cooperate with the holding members 281, 183 to connect the grounding wires of the liquid crystal display 20 to ground. This grounding configuration is achieved by elastic and mechanical interengagement. Unlike conventional art, there is no reliance on a conductive film. Thus, the liquid crystal display 20 has high reliability.
It is believed that the present embodiments and their advantages will be understood from the foregoing description, and it will be apparent that various changes may be made thereto without departing from the spirit and scope of the invention or sacrificing all of its material advantages, the examples hereinbefore described merely being preferred or exemplary embodiments of the invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 94146372 | Dec 2005 | TW | national |
