Display apparatus having a back-light unit

Patent metadata

Field	Value
Publication number	US-2025264758-A1
Application number	US-202418987495-A
Country	US
Kind code	A1
Filing date	Dec 19, 2024
Priority date	Feb 20, 2024
Publication date	Aug 21, 2025
Grant date	—

Abstract

A display apparatus including a back-light unit is provided. The display apparatus may include a back-light unit including a light source unit and an optical sheet on the light source unit, a light path conversion unit on the optical sheet of the back-light unit, and a display panel on the light path conversion unit. The light source unit may include a plurality of first light source devices, a plurality of second light source devices, and a plurality of light guide patterns. The first light source devices may be spaced apart from the second light source devices and the light guide patterns and may be configured to emit light toward the light conversion unit. Each of the second light source devices may be configured to emit light toward a side of at least one of the light guide patterns.

First claim

What is claimed is:

1 . A display apparatus, comprising:
a back-light unit including a light source unit and an optical sheet on the light source unit; a light path conversion unit on the optical sheet of the back-light unit; and a display panel on the light path conversion unit, wherein the light source unit includes a plurality of first light source devices, a plurality of second light source devices, and a plurality of light guide patterns, wherein the first light source devices are spaced apart from the second light source devices and the light guide patterns and are configured to emit light toward the light conversion unit, and wherein each of the second light source devices is configured to emit light toward a side of at least one of the light guide patterns.

2 . The display apparatus of claim 1 , wherein:
the light source unit further includes a base substrate disposed parallel to the optical sheet; and the first light source devices, the second light source devices, and the light guide patterns are disposed side by side on the base substrate.

3 . The display apparatus of claim 1 , wherein each of the second light source devices has a different planar shape from each of the first light source devices.

4 . The display apparatus of claim 3 , wherein each of the second light source devices has a planar shape extending along a side of at least one of the light guide patterns.

5 . The display apparatus of claim 1 , wherein a number of the second light source devices is different from a number of the first light source devices.

6 . The display apparatus of claim 1 , wherein a number of the light guide patterns is different from the number of the second light source devices.

7 . The display apparatus of claim 1 , wherein:
the light path conversion unit includes a first control electrode, a second control electrode, and a variable diffusion layer disposed between the first control electrode and the second control electrode; and the variable diffusion layer includes a polymer dispersed liquid crystal (PDLC).

8 . The display apparatus of claim 7 , wherein:
the first control electrode includes a plurality of electrode patterns spaced apart from each other; and each of the electrode patterns overlaps at least one of the light guide patterns.

9 . The display apparatus of claim 1 , wherein each of the first light source devices is surrounded by the second light source devices and the light guide patterns.

10 . The display apparatus of claim 9 , wherein each of the second light source devices is disposed between the first light source devices.

11 . A display apparatus, comprising:
a back-light unit; a liquid crystal panel on the back-light unit; and a light path conversion unit disposed between the back-light unit and the liquid crystal panel, wherein the back-light unit includes a base substrate, a light source unit on an upper surface of a base substrate toward the light path conversion unit, and an optical sheet between the light source unit and the light path conversion unit, wherein the light source unit includes a first light source device configured to emit light toward the light path conversion unit, a light guide pattern spaced apart from the first light source device, and a second light source device disposed at a side of the light guide pattern, and wherein light transmitted to the light path conversion unit by the second light source device via the light guide pattern has a higher straightness than the light emitted from the first light source device to the light path conversion unit.

12 . The display apparatus of claim 11 , wherein a corner area of the light guide pattern toward the first light source device has a chamfer shape.

13 . The display apparatus of claim 11 , wherein:
the optical sheet includes a base sheet and a plurality of prisms disposed on the base sheet; and the plurality of prisms extend parallel to each other in a first direction.

14 . The display apparatus of claim 13 , wherein the plurality of prisms are disposed on a lower surface of the base sheet facing toward the light source unit.

15 . The display apparatus of claim 13 , wherein:
an upper surface of the light guide pattern facing toward the optical sheet includes a plurality of protrusions; a cross-section of each of the plurality of protrusions has a shape corresponding to a cross-section of each of the plurality of prisms; and the plurality of protrusions extend in a second direction intersecting the first direction.

Assignees

• Lg Display Co Ltd

Inventors

• Seo Myung Won
• Lim Ki Sung
• Moon Jin Su
• Kim Ki Seong

Classifications

• G02F1/1334

  based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals · CPC title

• G02F1/134309

  characterised by their geometrical arrangement · CPC title

• G02F1/133611

  including means for improving the brightness uniformity · CPC title

• G02F1/133606 Primary

  including a specially adapted diffusing, scattering or light controlling members · CPC title

• G02F1/133607

  the light controlling member including light directing or refracting elements, e.g. prisms or lenses · CPC title