Display apparatus

Patent metadata

Field	Value
Publication number	US-9303845-B2
Application number	US-201313928767-A
Country	US
Kind code	B2
Filing date	Jun 27, 2013
Priority date	Apr 4, 2013
Publication date	Apr 5, 2016
Grant date	Apr 5, 2016

Abstract

A display apparatus is provided. The display apparatus may include a substrate, a light emitting device, a reflective layer, an optical sheet, and a display panel. The light emitting device may include a light emitting element mounted on the substrate and a lens disposed over the light emitting element. The reflective layer may be disposed over an upper surface of the substrate. The optical sheet may be disposed over the reflective layer, spaced apart from the light emitting device. The display panel may be disposed over an upper surface of the optical sheet. The lens may include a rounded convex upper surface having an aspherical shape, and a lower surface central part recessed upward from an undersurface of the lens.

First claim

What is claimed is:

1. A display apparatus, comprising:
a substrate;
a light emitting device, comprising a light emitting element mounted on the substrate and a lens disposed over the light emitting element;
a reflective layer disposed over an upper surface of the substrate;
an optical sheet disposed over the reflective layer and spaced apart from the light emitting device; and
a display panel disposed over an upper surface of the optical sheet, wherein the lens comprises:
an upper surface part having an aspherical convexly rounded contour; and
a lower surface central part formed as a recess that extends upward from an undersurface of the lens,
wherein the recess has a shape of a pair of overlapping prisms or a pair of crossing triangular pillars,
wherein the recess forming the lower surface central part includes a first inclined surface and a second inclined surface, the first and second inclined surface having upper end portions which meet at a point spaced upward from a bottom surface of the lower surface central part.

2. The display apparatus of claim 1 , wherein the upper surface part of the lens has an isotropic structure in which a surface of the lens is convexly curved at a certain curvature from an upper surface central part of the lens to an edge of the lens.

3. The display apparatus of claim 2 , wherein the upper surface central part of the lens is recessed to a certain depth, and an upper end of the lower surface central part and a lower end of the upper surface central part of the lens are spaced from each other by a certain distance.

4. The display apparatus of claim 3 , wherein the upper surface part of the lens comprises:
a first curved surface in which at least a portion of light refracted at a surface of the lower surface central part is totally reflected; and
a second curved surface extending from an end of the first curved surface to define a corresponding edge region of the lens.

5. The display apparatus of claim 1 , wherein the pair of prisms or pair of triangular pillars forming the recess that forms the lower surface central part overlap or cross each other at respective upper end portions thereof corresponding to a central point of the lens.

6. The display apparatus of claim 1 , wherein the pair of prisms or pair of triangular pillars forming the recess that forms the lower surface central part overlap or cross each other at respective upper end portions thereof corresponding to a central point of the lens.

7. The display apparatus of claim 1 , wherein the lens has a luminous intensity distribution (S/P) ranging from about 0.3 to about 0.5, wherein S is a vertical distance from an uppermost surface t of the lower surface central part of the lens to an uppermost portion of the upper surface part of the lens, and P is a horizontal distance from a center of the lens to a point where a gradient of the upper surface part of the lens becomes zero.

8. The display apparatus of claim 1 , wherein the upper surface part of the lens is rounded at a certain curvature such that an incidence angle of light incident thereof is greater than or equal to about 42 degrees.

9. The display apparatus of claim 1 , wherein an edge portion of the reflective layer extends upward at an incline toward the optical sheet.

10. The display apparatus of claim 1 , wherein the optical sheet comprises a plurality of light shielding patterns formed therein, the plurality of light shielding patterns comprising at least one of a protrusion-type pattern, a dark dotted pattern, or a hold pattern.

11. The display apparatus of claim 1 , wherein the reflective layer comprises a plurality of reflective patterns formed therein, comprising a transparent protrusion-type pattern.

12. The display apparatus of claim 1 , further comprising a light guide layer that forms a gap between the reflective layer and the optical sheet, the light guide layer comprising one of an air layer or a vacuum layer.

13. A display apparatus, comprising:
a light emitting device, comprising a light emitting element mounted on a substrate and a lens disposed over the light emitting element; and
a reflective layer, an optical sheet and a display panel sequentially disposed over the substrate, wherein the lens comprises:
an upper surface having an aspherical convexly rounded contour; and
a lower surface having a recess formed at a central portion thereof that extends upward from the lower surface of the lens of the lens, a shape of the recess corresponding to a pair of overlapping prisms or a pair of crossing triangular pillars,
wherein the recess forming the lower surface central part includes a first inclined surface and a second inclined surface, the first and second inclined surface having upper end portions which meet at a point spaced upward from a bottom surface of the lower surface central part.

14. The display apparatus of claim 13 , wherein the upper surface of the lens comprises:
an upper central portion that is recessed to a predetermined depth;
a first curved surface extending from the upper central portion, wherein at least a portion of light refracted at the lower surface of the lens is completely reflected by the first curved surface; and
a second curved surface extending from an end of the first curved surface and defining a corresponding edge portion of the lens.

15. The display apparatus of claim 14 , wherein a lower end of the recess forming the upper central portion of the upper surface of the lens, and an upper end of the recess formed in the lower surface of the lens, are spaced apart a predetermined distance.

16. The display apparatus of claim 14 , wherein the lens has a luminous intensity distribution (S/P) ranging from about 0.3 to about 0.5, where
S is a vertical distance from an uppermost surface t of the recess formed at the central portion of the lower surface of the lens to a point on the upper surface of the lens at which a gradient of the upper surface of the lens is zero, and
P is a horizontal distance from a center of the lens to the point at which the gradient of the upper surface of the lens is zero.

Assignees

• Lg Electronics Inc

Inventors

• Jeong Chansung
• Park Sangtae
• Hur Hoon

Classifications

• G02F1/133603

  with LEDs · CPC title

• G02B19/0066

  in the form of an LED array · CPC title

• F21V13/04

  the elements being reflectors and refractors {(for vehicle rear lights F21S43/40)} · CPC title

• G02F1/133606 Primary

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

• G02B19/0028 Primary

  refractive and reflective surfaces, e.g. non-imaging catadioptric systems · CPC title