Backlight assembly, liquid crystal display apparatus having the same and method thereof

• US 7,549,760 B2
• Filed: 02/20/2007
• Issued: 06/23/2009
• Est. Priority Date: 05/20/2006
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Jung, Dae-Yoon, Lee, Kwang-Hoon
• Primary Examiner(s): Choi; Jacob Y
• Application Number:
  US11/676,566
• Publication Number:
  US 20070268721A1
• Time in Patent Office: 854 Days
• Field of Search: 362/606, 362/607, 362/609, 362/610, 362/611, 362/612, 362/613, 362/614, 362/616, 362/617, 362/618, 362/619, 362/561, 362/97, 349/62, 349/64, 359/599
• US Class Current: 362/97.1
• CPC Class Codes: G02F 1/133604 with lamps
• CPC Class Codes: G02F 1/133605 including specially adapted reflectors
• CPC Class Codes: G02F 1/133606 including a specially adapted diffusing, scattering or light controlling members

Abstract

A backlight assembly includes a plurality of lamps, a first reflecting plate and an optical member. The lamps are disposed substantially parallel with each other and generate light. The bottom reflecting plate is disposed under the lamps to reflect the light. The first reflecting plate is disposed over the lamps to transmit and reflect the light and has a plurality of penetration holes for transmitting the light. The optical member is disposed over the first reflecting plate. The formation density of the penetration holes increases as a position of the penetration holes approaches an intermediate region between adjacent lamps from a region corresponding to a position of the lamps.

Claims

1. A direct backlight assembly comprising:

A plurality of elongated lamps disposed substantially parallel with each other, the lamps generating light; and

a first reflecting plate disposed over the lamps in the direct backlight assembly, the first reflecting plate including a plurality of penetration holes spaced in a longitudinal direction of the first reflecting plate and in a transverse direction of the first reflecting plate,

wherein a formation density of the penetration holes increases as a position of the penetration holes approaches an intermediate region between adjacent lamps from a region corresponding to a position of the lamps.

2. The direct backlight assembly of claim 1, wherein a diameter of the penetration holes is in a range of about 10 μ

m (micrometers) to about 100 μ

m(micrometers).

3. The direct backlight assembly of claim 1, wherein the first reflecting plate includes polyethylene terephthalate (“

PET”

) or polycarbonate (“

PC”

).

4. The direct backlight assembly of claim 1, further comprising a second reflecting plate disposed under the lamps.

5. The direct backlight assembly of claim 4, wherein a distance between the first reflecting plate and the second reflecting plate is in a range of about 5 millimeters (mm) to about 10 millimeters (mm).

6. The direct backlight assembly of claim 1, further comprising an optical member disposed over the first reflecting plate, the optical member including:

a diffusing plate diffusing the light passing through the first reflecting plate;

a diffusing sheet disposed over the diffusing plate; and

a condensing sheet disposed over the diffusing plate.

7. The direct backlight assembly of claim 6, wherein the first reflecting plate is attached and fixed to a bottom surface of the diffusing plate.

8. The direct backlight assembly of claim 1, wherein the penetration holes are spaced at substantially the same interval in the longitudinal direction of the first reflecting plate and in varying intervals in the transverse direction of the first reflecting plate, such that a formation density of the penetration holes increases as a position of the penetration holes approaches an intermediate region between adjacent lamps from a region corresponding to a position of the lamps.

9. A direct backlight assembly comprising:

a plurality of elongated lamps disposed substantially in parallel with each other, the lamps generating light;

a bottom reflecting plate disposed under the lamps in the direct backlight assembly and reflecting the light;

a diffusing plate disposed over the lamps in the direct backlight assembly and diffusing the light; and

a printed pattern layer formed on a bottom surface of the diffusing plate facing the lamps, the printed pattern layer including a plurality of penetration holes transmitting the light, the penetration holes spaced in a longitudinal direction of the diffusing plate and in a transverse direction of the diffusing plate,

wherein a formation density of the penetration holes of the printed pattern layer increases as a position of the penetration holes approaches an intermediate region between adjacent lamps from a region corresponding to a position of the lamps.

10. The direct backlight assembly of claim 9, wherein the printed pattern layer is patterned with an ink reflecting light.

11. The direct backlight assembly of claim 9, wherein the penetration holes are spaced at substantially the same interval in a longitudinal direction of the diffusing plate and in varying intervals in a transverse direction of the diffusing plate, such that the formation density of the penetration holes of the printed pattern layer increases as a position of the penetration holes approaches in the intermediate region between adjacent lamps from the region corresponding to the position of the lamps.

12. The direct backlight assembly of claim 9, wherein a distance between the printed pattern layer and the bottom reflecting plate is in a range of about 5 millimeters (mm) to about 10 millimeters (mm).

13. The direct backlight assembly of claim 9, further comprising:

a diffusing sheet disposed over the diffusing plate; and

a condensing sheet disposed over the diffusing plate.

14. A display apparatus comprising:

a direct backlight assembly including;

a plurality of elongated lamps disposed substantially parallel with each other, the lamps generating light;

a bottom reflecting plate disposed under the lamps to reflect the light;

a perforated reflecting plate disposed opposite to the bottom reflecting plate with respect to the lamps, and reflecting and transmitting the light, the perforated reflecting plate including a plurality of penetration holes transmitting the light, the penetration holes spaced in a longitudinal direction of the perforated reflecting plate and in a transverse direction of the perforated reflecting plate;

an optical member disposed over the perforated reflecting plate; and

a display panel disposed over the optical member, the display panel displaying images via the light passing through the optical member,

wherein a formation density of the penetration holes increases as a position of the penetration holes approaches an intermediate region between adjacent lamps from a region corresponding to a position of the lamps.

15. The display apparatus of claim 14, wherein the optical member includes a diffusing plate diffusing the light passing through the perforated reflecting plate, wherein the perforated reflecting plate is attached and fixed to a bottom surface of the diffusing plate.

16. A display apparatus comprising:

a direct backlight assembly including;

a plurality of elongated lamps disposed substantially in parallel with each other, the lamps generating light;

a bottom reflecting plate disposed under the lamps to reflect the light;

a diffusing plate disposed over the lamps and diffusing the light; and

a printed pattern layer formed on a bottom surface of the diffusing plate facing the lamps, the printed pattern layer being patterned with an ink to reflect the light and including a plurality of penetration holes transmitting the light, the penetration holes spaced in a longitudinal direction of the diffusing plate and in a transverse direction of the diffusing plate; and

a display panel disposed over the diffusing plate, and opposite to the bottom reflecting plate with respect to the lamps, the display panel displaying images,

wherein a formation density of the penetration holes of the printed pattern layer increases as a position of the penetration holes approaches an intermediate region between adjacent lamps from a region corresponding to a position of the lamps.