Backlighting device for dual liquid crystal display and folder-type mobile phone therewith

• US 7,034,799 B2
• Filed: 10/10/2002
• Issued: 04/25/2006
• Est. Priority Date: 12/14/2001
• Status: Expired due to Term

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Lee, Seog-Geun
• Primary Examiner(s): Lefkowitz, Sumati
• Assistant Examiner(s): Xiao, Ke
• Application Number:
  US10/268,565
• Publication Number:
  US 20030112217A1
• Time in Patent Office: 1,293 Days
• Field of Search: 349/112, 349 61- 71, 345 4- 6, 345/102, 455/403, 455/566, 455/560
• US Class Current: 345/102
• CPC Class Codes: G02F 1/133342 for double-sided displays
• CPC Class Codes: G02F 1/133604 with lamps
• CPC Class Codes: G02F 1/13452 Conductors connecting driver circuitry and terminals of panels
• 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 1/22 Illumination; Arrangements for improving the visibility of characters on dials
• CPC Class Codes: H04M 2250/16 including more than one display unit

Abstract

Disclosed is a backlighting device for a dual LCD (Liquid Crystal Display). The backlighting device includes a circuit board with a through hole; a backlighting illumination device situated within the hole for radiating light in a first direction substantially perpendicular to a first face of the circuit board and in a second direction substantially perpendicular to a second face of the circuit board; a main LCD being situated on one face of the backlighting illumination device in the first direction, for displaying first information in the first direction; and a slave LCD being situated on another face of the backlighting illumination device through the through hole in the second direction, for displaying second information in the second direction.

Claims

1. A backlighting device for a dual LCD (Liquid Crystal Display), comprising:

a circuit board having a hole located therein;

a backlighting illumination device situated within the hole for radiating light in a first direction substantially perpendicular to a first face of the circuit board and in a second direction substantially perpendicular to a second face of the circuit board;

a main LCD being situated on a first face of the backlighting illumination device in the first direction, for displaying first information in the first direction; and

a slave LCD being situated on second face of the backlighting illumination device through the through hole in the second direction, for displaying second information in the second direction.

2. The backlighting device of claim 1, wherein the backlighting illumination device comprises:

a light emitting diode being provided between the main LCD and the slave LCD; and

a light guide plate for transferring light emitted from the light emitting diode to the main LCD and the slave LCD.

3. The backlighting device of claim 2, wherein the backlighting illumination device further comprises a diffusion sheet being installed between the light guide plate and the main LCD, for diffusing light transferred to a lower face of the main LCD.

4. The backlighting device of claim 1, wherein the main LCD comprises:

liquid crystal;

upper and lower glasses provided above and below the liquid crystal, respectively;

an upper polarizer provided on the upper glass; and

a semi-transparent lower polarizer provided on the lower glass.

5. The backlighting device of claim 1, wherein the slave LCD comprises:

liquid crystal;

upper and lower glasses provided above and below the liquid crystal, respectively;

an upper polarizer provided on the upper glass; and

a lower polarizer provided on the lower glass, situated between the backlighting illumination device and the circuit board, said lower polarizer having a size greater than the hole, the lower polarizer facing the backlighting device.

6. The backlighting device of claim 1, wherein the backlighting illumination device comprises an electro-luminescence sheet provided between a lower face of the main LCD and a lower face of the slave LCD.

7. The backlighting device of claim 6, wherein the electro-luminescence sheet further comprises a diffusion sheet installed at a lower face of the main LCD to diffuse light transferred to the lower face of the main LCD.

8. A folder-type mobile phone with a backlighting device for a dual LCD, comprising:

a body;

the backlighting device including;

a circuit board having a hole located therein;

a backlighting illumination device situated within the hole for radiating light in a first direction substantially perpendicular to a first face of the circuit board and in a second direction substantially perpendicular to a second face of the circuit board;

a main LCD situated on first face of the backlighting illumination device in the first direction, for displaying first information in the first direction;

a slave LCD situated on a second face of the backlighting illumination device and located within the hole in the second direction, for displaying second information in the second direction; and

a folder rotatably foldable to the main body by a hinge device.

9. The folder-type mobile phone of claim 8, wherein the backlighting illumination device further comprises:

a light emitting diode provided between the main LCD and the slave LCD, for emitting light; and

a light guide plate for transferring light emitted from the light emitting diode to the main LCD and the slave LCD.

10. The folder-type mobile phone claim 9, wherein the backlighting illumination device further comprises a diffusion sheet installed between the light guide plate and the main LCD, for diffusing light transferred to a lower face of the main LCD.

11. The folder-type mobile phone of claim 8, wherein the main LCD comprises:

liquid crystal;

upper and lower glasses provided above and below the liquid crystal, respectively;

an upper polarizer provided on the upper glass; and

a semi-transparent lower polarizer provided on the lower glass.

12. The folder-type mobile phone of claim 8, wherein the slave LCD comprises:

liquid crystal;

upper and lower glasses provided above and below the liquid crystal, respectively;

an upper polarizer provided on the upper glass; and

a lower polarizer provided on the lower glass, situated between the backlighting illumination device and the circuit board, sad lower polarizer having a size greater than the hole, the lower polarizer facing the bi-directional backlighting device.

13. The folder-type mobile phone of claim 8, wherein the backlighting illumination device comprises an electro-luminescence sheet provided between a lower face of the main LCD and a lower face of the slave LCD.

14. The folder-type mobile phone of claim 13, wherein the electro-luminescence sheet further comprises a diffusion sheet installed at lower face of the main LCD to diffuse light transferred to the lower face of the main LCD.