Dual sided liquid crystal display device and mobile telecommunication terminal using the same

• US 6,466,292 B1
• Filed: 06/19/2000
• Issued: 10/15/2002
• Est. Priority Date: 06/17/1999
• Status: Expired due to Term

• Current Assignee: LG Information & Communications Ltd. (LG Corporation)
• Original Assignee: LG Information & Communications Ltd. (LG Corporation)
• Inventors: Kim, Hong Joo
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): CHOWDHURY, TARIFUR RASHID
• Application Number:
  US09/596,559
• Time in Patent Office: 848 Days
• Field of Search: 349/143, 349/16, 349/113, 353/20, 455/566, 455/556, 455/557, 455/575
• US Class Current: 349/143
• CPC Class Codes: G02F 1/133342 for double-sided displays
• CPC Class Codes: G02F 1/133541 Circular polarisers
• CPC Class Codes: G02F 1/133553 Reflecting elements associated to illuminating devices G02F1/133605
• CPC Class Codes: H04M 1/0214 Foldable telephones, i.e. with body parts pivoting to an open position around an axis parallel to the plane they define in closed position combined with translation movement H04M1/0235
• CPC Class Codes: H04M 1/0245 using open/close detection
• CPC Class Codes: H04M 2250/16 including more than one display unit

Abstract

A liquid crystal display device and a mobile telecommunication terminal using the same can display messages such as information on a calling party, a received message, and temporal information even when a folding cover is not open by using a double-faced liquid crystal display device. The double-faced liquid crystal display device includes a first substrate having a common electrode, a second substrate having n scan electrodes and m signal electrodes, a liquid crystal layer disposed between the first and second substrates, a polarizer, and a reflector, wherein the liquid crystal display device is divided into a first region and a second region, and the polarizer and the reflector are symmetrically disposed so that the first region is displayed in a first direction and the second region is displayed in a second direction.

Claims

1. A mobile telecommunication terminal, comprising:

a folding cover attached to a base and movable between an open position and a closed position, the folding cover having an inner surface and an opposed exterior surface, wherein the inner surface is adjacent the base when the folding cover is in the closed position;

a liquid crystal display device in the folding cover, the liquid crystal display having a first viewable region and a nonoverlapping, contiguous second viewable region, wherein the first viewable region is viewable when the folding cover is in the open position but not when the folding cover is in the closed position;

wherein the second viewable region is viewable when the folding cover is in the closed position;

wherein a first front polarizer and a first rear mirror sandwich the first viewable region; and

wherein a second front polarizer and a second rear mirror sandwich the second viewable region; and

a driver for driving the liquid crystal display device.

2. The mobile telecommunication terminal as claimed in claim 1, further comprising a folder switch for detecting open and closed states of the folding cover, and a controller for controlling the driver to selectively produce an image in either the first viewable region or in the second viewable region in accord with the state of the folder switch.

3. The mobile telecommunication terminal as claimed in claim 2, wherein the controller selectively produces an image in the first viewable region when the folder cover is open.

4. The mobile telecommunication terminal as claimed in claim 2, wherein the controller selectively produces an image in the second viewable region when the folder cover is closed.

5. A mobile telecommunication terminal according to claim 1, wherein the liquid crystal display device further includes:

a first substrate having a common electrode;

a second substrate having n scan electrodes and m signal electrodes; and

a liquid crystal layer disposed between the first and second substrates.