Two-Directions Light Transmission Reflective-Transmissive Prism Sheet, Two-Directions Backlight Assembly, and Liquid Crystal Display Having the Two-Directions Backlight Assembly

• US 20070008738A1
• Filed: 06/20/2006
• Published: 01/11/2007
• Est. Priority Date: 07/11/2005
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Han, Byung-woong, Chu, Young-bee, Kim, Kyu-seok, Kim, Dong-cheol
• Application Number:
  US11/425,274
• Publication Number:
  US 20070008738A1
• Time in Patent Office: Days
• US Class Current: 362/607
• CPC Class Codes: G02B 27/0972 Prisms prisms per se G02B5/04
• CPC Class Codes: G02B 27/1046 for use with transmissive spatial light modulators
• CPC Class Codes: G02B 27/12 operating by refraction only
• CPC Class Codes: G02B 27/14 operating by reflection only
• CPC Class Codes: G02B 5/045 Prism arrays
• CPC Class Codes: G02F 1/133342 for double-sided displays
• CPC Class Codes: G02F 1/133606 including a specially adapted diffusing, scattering or light controlling members
• CPC Class Codes: G09G 3/3426 the different display panel areas being distributed in two dimensions, e.g. matrix

Abstract

A two-directions light transmission transflective prism sheet, a two-directions backlight assembly, and a two-directions liquid crystal display (LCD) device having the two-directions backlight assembly are provided. The two-directions light transmission transflective prism sheet includes a two-directions light transmission transflective film that reflects some incident light irradiated from a light source and transmits the remainder of the light, and a plurality of prism patterns that are formed on one surface of the two-directions light transmission transflective film to have a predetermined height and a predetermined width.

Claims

1. A two-directions light transmission transflective prism sheet comprising:

a two-directions light transmission transflective film that reflects some incident light irradiated from a light source and transmits the remainder of the light; and

a plurality of prism patterns formed on one surface of the two-directions light transmission transflective film, the plurality of prism patterns having a predetermined height and a predetermined width.

2. The two-directions light transmission transflective prism sheet of claim 1, wherein the plurality of prism patterns is formed by alternately forming a first slope and a second slope, each pair of the first slope and the second slope forming a peak or a valley in the plurality of prism patterns.

3. The two-directions light transmission transflective prism sheet of claim 2, wherein the angle of the peaks of the plurality of prism patterns is in a range of 45-135°

4. The two-directions light transmission transflective prism sheet of claim 2, wherein the angle between the first slope and the second slope in the valley of respective pairs of adjacent prism patterns is in a range of 70-110°

.

5. The two-directions light transmission transflective prism sheet of claim 2, wherein the prism patterns have a curved profile at their respective peaks.

6. The two-directions light transmission transflective prism sheet of claim 1, wherein the prism patterns have a refractive index of 1.40-1.70.

7. The two-directions light transmission transflective prism sheet of claim 1, wherein the two-directions light transmission transflective film has a haze characteristic of at least 30%.

8. The two-directions light transmission transflective prism sheet of claim 1, wherein the two-directions light transmission transflective film comprises dispersion particles dispersing light.

9. The two-directions light transmission transflective prism sheet of claim 8, wherein the dispersion particles are formed of one of titanium dioxide (TiO₂) and silicon dioxide (SiO₂).

10. The two-directions light transmission transflective prism sheet of claim 1, wherein the two-directions light transmission transflective film is formed of one selected from the group consisting of polycarbonate, polyester, and polyethylene terephthalate.

11. The two-directions light transmission transflective prism sheet of claim 1, wherein the two-directions light transmission transflective film has a thickness in a range of 50-100 μ

m.

12. The two-directions light transmission transflective prism sheet of claim 1, wherein the prism patterns have a height in a range of 12-25 μ

m.

13. The two-directions light transmission transflective prism sheet of claim 1, wherein the prism patterns have a width in a range of 1-300 μ

m.

14. The two-directions light transmission transflective prism sheet of claim 1, wherein the prism patterns have a cylindrical profile with a predetermined height and a predetermined width.

15. The two-directions light transmission transflective prism sheet of claim 1, wherein the heights of the prism patterns vary at a predetermined interval.

16. The two-directions light transmission transflective prism sheet of claim 1, wherein the prism patterns are formed of either acrylic resin or silicon resin.

17. A two-directions backlight assembly comprising:

a light source generating light;

a waveguide plate including a first light exit surface through which light incident upon the waveguide plate is emitted in a first direction and a second light exit surface through which the light incident upon the waveguide plate is emitted in a second direction, the second direction being opposite to the first direction; and

a two-directions light transmission transflective prism sheet arranged at one side of the waveguide plate and comprising a two-directions light transmission transflective film that reflects some incident light irradiated from a light source and transmits the remainder of the light, and a plurality of prism patterns formed on one surface of the two-directions light transmission transflective film, the plurality of prism patterns having a predetermined height and a predetermined width.

18. The two-directions backlight assembly of claim 17, further comprising:

a plurality of first optical sheets arranged on the first light exit surface for enhancing the brightness of light emitted through the first light exit surface in the first direction; and

a plurality of second optical sheets arranged on the second light exit surface for enhancing the brightness of light emitted through the second light exit surface in the second direction.

19. The two-directions backlight assembly of claim 17, wherein the plurality of prism patterns is formed by alternately forming a first slope and a second slope, each pair of the first slope and the second slope forming a peak or a valley in the plurality of prism patterns.

20. The two-directions backlight assembly of claim 19, wherein the angle of the peaks of the plurality of prism patterns is in a range of 45-135°

.

21. The two-directions backlight assembly of claim 19, wherein the angle between the first slope and the second slope in the valley of respective pairs of adjacent prism patterns is in a range of 70-110°

.

22. The two-directions backlight assembly of claim 17, wherein the prism patterns have a refractive index of 1.40-1.70.

23. The two-directions backlight assembly of claim 17, wherein the two-directions light transmission transflective film has a haze characteristic of at least 30%.

24. The two-directions backlight assembly of claim 17, wherein the two-directions light transmission transflective film comprises dispersion particles dispersing light.

25. The two-directions backlight assembly of claim 24, wherein the dispersion particles are formed of one of titanium dioxide (TiO₂) and silicon dioxide (SiO₂).

26. A two-directions liquid crystal display (LCD) device comprising:

a two-directions backlight assembly including a light source generating light, a waveguide plate including a first light exit surface through which light incident upon the waveguide plate is emitted in a first direction and a second light exit surface through which the light incident upon the waveguide plate is emitted in a second direction, the second direction being opposite to the first direction, and a two-directions light transmission transflective prism sheet arranged at one side of the waveguide plate and comprising a two-directions light transmission transflective film that reflects some incident light irradiated from a light source and transmits the remainder of the light, and a plurality of prism patterns formed on one surface of the two-directions light transmission transflective film, the plurality of prism patterns having a predetermined height and a predetermined width;

a first LCD panel disposed at one side of the two-directions backlight assembly toward the first direction and displaying a first image; and

a second LCD panel disposed at the other side of the two-directions backlight assembly toward the second direction and displaying a second image.

27. The two-directions LCD of claim 26, further comprising:

a plurality of first optical sheets arranged on the first light exit surface for enhancing the brightness of light emitted through the first light exit surface in the first direction; and

a plurality of second optical sheets arranged on the second light exit surface for enhancing the brightness of light emitted through the second light exit surface in the second direction.