Liquid crystal display device

• US 20040051825A1
• Filed: 03/26/2003
• Published: 03/18/2004
• Est. Priority Date: 09/14/2002
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Lee, Sang-Hee, Kang, Jung-Tae, Lee, Sang-Duk
• Granted Patent: US 7,154,572 B2
• Time in Patent Office: Days
• US Class Current: 349/65
• CPC Class Codes: G02B 6/0038 Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
• CPC Class Codes: G02B 6/0053 Prismatic sheet or layer; Brightness enhancement element, sheet or layer
• CPC Class Codes: G02F 1/133607 the light controlling member including light directing or refracting elements, e.g. prisms or lenses

Abstract

An LCD device has scratch-resistant property without using a protection sheet and can provide enhanced brightness. The LCD device includes a light path regulating member. The member includes a first prism sheet having first prisms of which apex has a round shape. The first prism sheet concentrates light supplied from a lamp to output the concentrated light. An anti-glare polarizing plate uniformly polarizes polarized planes of the concentrated light and provides the polarized light to the lower substrate. The anti-glare polarizing plate is arranged below the lower substrate of an LCD panel, and an uppermost prism sheet of optical sheets is non-matte-treated and has round-treated apexes. In spite of the absence of the protection sheet, the scratch-resistant property of the uppermost prism sheet and the brightness of the LCD panel may be enhanced.

Claims

1. A liquid crystal display device comprising:

a backlight assembly comprising a light path regulating means including a first prism sheet, and the first prism sheet concentrating a first light supplied from an internal light source, regulating a light path of the first light and outputting a second light; and

a liquid crystal display panel assembly including an anti-glare polarizing plate for uniformly polarizing a polarized plane of the second light, and the liquid crystal display panel assembly displaying an image based on the second light.

2. The liquid crystal display device of claim 1, wherein the first prism sheet has a plurality of first prisms formed on a first transparent film, and an apex of each of the first prisms has a round shape.

3. The liquid crystal display device of claim 1, wherein the liquid crystal display panel assembly further includes i) an upper substrate, ii) a lower substrate facing the upper substrate, iii) a liquid crystal layer interposed between the upper and lower substrates, and the anti-glare polarizing plate is arranged on a rear surface of the lower substrate and provides the lower substrate with the polarized second light.

4. The liquid crystal display device of claim 3, wherein a front face of the anti-glare polarizing plate faces the lower substrate, and a rear face of the anti-glare polarizing plate is treated to have a haze value in a range from about 12% to about 44%.

5. The liquid crystal display device of claim 1, wherein the light path regulating means further includes a second prism sheet having a plurality of second prisms formed on a second transparent film, the second prism sheet being disposed below the first prism sheet and concentrating the first light supplied from the lamp to provide the first prism sheet with the concentrated light.

6. The liquid crystal display device of claim 1, wherein the backlight assembly further comprises a light guiding plate and a diffusion member formed on a face of the light guiding plate so as to be opposite to the liquid crystal display panel assembly, the light guiding plate receives the first light from the lamp, guides the light path of the first light, diffuses the guided light by the diffusion member, and outputs the diffused light to the LCD panel assembly.

7. The liquid crystal display device of claim 6, wherein the first prism sheet is a curved type prism sheet for concentrating the diffused light in a first direction with respect to a surface of the diffusion member.

8. The liquid crystal display device of claim 7, wherein the curved type prism sheet comprises a plurality of triangular prisms each of which has a bottom surface, a first oblique face and a second oblique face, apexes each of which is formed by the first oblique face and the second oblique face has a substantially same height, a ridge of each of the apexes is the shape of a curved line, furrows each between adjacent triangular prisms has a substantially same depth, and each of the furrows has the shape of a straight line or a curved line.

9. The liquid crystal display device of claim 7, wherein the curved type prism sheet comprises a plurality of triangular prisms each of which has a bottom surface, a first oblique face and a second oblique face, apexes each of which is formed by the first oblique face and the second oblique face has a substantially same height, a ridge of each of the apexes has a shape of a straight line, furrows between adjacent triangular prisms has a substantially same depth, and each of the furrows has a shape of a curved line.

10. A liquid crystal display device comprising:

a backlight assembly comprising i) a lamp for generating a first light, and ii) a light path regulating means including a first prism sheet having a plurality of first prisms formed on a first transparent film, an apex of each of the first prisms has a round shape, and the first prism sheet concentrating the first light supplied from the lamp, regulating a light path of the first light and outputting a second light; and

a liquid crystal display panel assembly including i) an upper substrate, ii) a lower substrate facing the upper substrate, iii) a liquid crystal layer interposed between the upper and lower substrates, and iv) an anti-glare polarizing plate, arranged on a rear surface of the lower substrate, for uniformly polarizing a polarized plane of the second light to provide the lower substrate with the polarized second light, and the liquid crystal display panel assembly displaying an image based on the second light.

11. The liquid crystal display device of claim 10, wherein a front face of the anti-glare polarizing plate faces the lower substrate, and a rear face of the anti-glare polarizing plate is treated to have a predetermined haze value.

12. The liquid crystal display device of claim 11, wherein the haze value is in a range from about 12% to about 44%.

13. The liquid crystal display device of claim 10, wherein the light path regulating means further comprises a second prism sheet including a plurality of second prisms formed on a second transparent film, the second prism sheet being disposed below the first prism sheet and concentrating the first light supplied from the lamp to provide the first prism sheet with the concentrated light.

14. The liquid crystal display device of claim 10, wherein the second prism sheet is non-matte-treated.

15. The liquid crystal display device of claim 10, wherein the backlight assembly further comprises a diffusion sheet for diffusing the first light supplied from the lamp to output the diffused light to the first prism sheet.

16. The liquid crystal display device of claim 10, wherein the backlight assembly further comprises a light guiding plate and a diffusion member formed on a face of the light guiding plate so as to be opposite to the liquid crystal display panel assembly, the light guiding plate receives the first light from the lamp, guides the light path of the first light, diffuses the guided light by the diffusion member, and outputs the diffused light to the LCD panel assembly.

17. The liquid crystal display device of claim 16, wherein the first prism sheet is a curved type prism sheet for concentrating the diffused light in a first direction with respect to a surface of the diffusion member.

18. The liquid crystal display device of claim 17, wherein the curved type prism sheet comprises a plurality of triangular prisms each of which has a bottom surface, a first oblique face and a second oblique face, apexes each of which is formed by the first oblique face and the second oblique face has a substantially same height, a ridge of each of the apexes is the shape of a curved line, furrows each between adjacent triangular prisms has a substantially same depth, and each of the furrows has the shape of a straight line or a curved line.

19. The liquid crystal display device of claim 17, wherein the curved type prism sheet comprises a plurality of triangular prisms each of which has a bottom surface, a first oblique face and a second oblique face, apexes each of which is formed by the first oblique face and the second oblique face has a substantially same height, a ridge of each of the apexes has a shape of a straight line, furrows between adjacent triangular prisms has a substantially same depth, and each of the furrows has a shape of a curved line.

20. The liquid crystal display device of claim 17, wherein liquid crystal display device further comprises a second prism sheet disposed below the first prism sheet, the second prism sheet is a linear type prism sheet for concentrating the diffused light in a second direction that is different from the first direction.

21. The liquid crystal display device of claim 10, wherein the backlight assembly further includes:

a light guiding plate for guiding the light path of the first light generated from the lamp and for outputting the guided light; and

a diffusion sheet, disposed over the light guiding plate, for diffusing the guided light guided by the light guiding plate.