Illuminating lamp for a display device, an illuminating device for a display device, and a display device

• US 7,794,096 B2
• Filed: 07/18/2006
• Issued: 09/14/2010
• Est. Priority Date: 07/15/2005
• Status: Expired due to Fees

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Iwamoto, Kenichi
• Primary Examiner(s): Tran; Thuy Vinh
• Application Number:
  US11/995,759
• Publication Number:
  US 20090033234A1
• Time in Patent Office: 1,519 Days
• Field of Search: 315/185.R, 315/189, 313/567, 313/568, 313/569, 362/97.1, 362/97.2, 345/102
• US Class Current: 362/97.2
• CPC Class Codes: G02F 1/133604 with lamps
• CPC Class Codes: G02F 1/133613 characterized by the sequence of light sources
• CPC Class Codes: H05B 41/245 for a plurality of lamps

Abstract

An illuminating lamp for a display device is capable of minimizing a luminance difference between a high-voltage driving side and a low-voltage driving side. The illuminating lamp is arranged behind a display panel via optical sheets and driven in a high-voltage driving method. The illuminating lamp includes discharge lamps connected in series, wherein gas pressures of the discharge lamps at a high-voltage driving side are set to be higher than those of the discharge lamps at a low-voltage driving side.

Claims

1. An illuminating device for a display device, which is disposed behind a display panel, the illuminating device comprising:

a backlight chassis made from a metal plate material; and

a plurality of discharge lamps connected in series and disposed on the backlight chassis;

wherein

gas pressures of the discharge lamps at a high-voltage driving side are higher than gas pressures of the discharge lamps at a low-voltage driving side.

2. The illuminating device for a display device according to claim 1, wherein a potential of the discharge lamps connected in series is floated at the low-voltage driving side.

3. The illuminating device for a display device according to claim 1, wherein a potential of the discharge lamps connected in series is grounded at the low-voltage driving side.

4. The illuminating device for a display device according to claim 1, wherein the discharge lamps connected in series are arranged in a zigzag configuration.

5. A display device comprising the illuminating device for a display device according to claim 1.