Display device having reflecting sheet with plurality of dot areas reducing reflectivity of the reflecting sheet

• US 10,408,422 B2
• Filed: 01/10/2019
• Issued: 09/10/2019
• Est. Priority Date: 10/31/2014
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Oh, Sewon, Kim, Eunseok
• Primary Examiner(s): Kryukova, Erin
• Application Number:
  US16/244,762
• Publication Number:
  US 20190154234A1
• Time in Patent Office: 243 Days
• CPC Class Codes: F21V 7/0066 specially adapted to cooperate with point like light sources; specially adapted to cooperate with light sources the shape of which is unspecified F21V7/16 - F21V7/30 take precedence
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02F 1/133603 with LEDs
• 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
• CPC Class Codes: G02F 1/133607 the light controlling member including light directing or refracting elements, e.g. prisms or lenses
• CPC Class Codes: G02F 1/133611 including means for improving the brightness uniformity

Abstract

A display device includes a display panel; a frame at a rear of the display panel; a plurality of substrates on the frame; a plurality of light sources disposed on the plurality of substrates, and including a first light source disposed at a first corner portion of the frame, a second light source disposed at a second corner portion of the frame, a third light source disposed at a third corner portion of the frame, and a fourth light source disposed at a fourth corner portion of the frame; a reflection layer including a first opening where the first light source is located, a second opening where the second light source is located, a third opening where the third light source is located, and a fourth opening where the fourth light source is located; a first absorber disposed on the reflection layer at a first area near the first opening and configured to absorb light emitted by the first light source; a second absorber disposed on the reflection layer at a second area near the second opening and configured to absorb light emitted by the second light source; a third absorber disposed on the reflection layer at a third area near the third opening and configured to absorb light emitted by the third light source; and a fourth absorber disposed on the reflection layer at a fourth area near the fourth opening and configured to absorb light emitted by the fourth light source.

Claims

1. A display device comprising:

a display panel including a first long side, a second long side opposite to the first long side, a first short side connected with an end of the first long side and an end of the second long side, a second short side connected with the other end of the first long side and the other end of the second long side;

a frame at a rear of the display panel, the frame having a rectangular shape such that the frame includes a first corner between the first long side and the first short side, a second corner between the first long side and the second short side, a third corner between the second long side and the first short side and a fourth corner between the second long side and the second short side;

a plurality of substrates on the frame;

a plurality of light sources disposed on the plurality of substrates, and including a first light source disposed at a first corner portion near the first corner of the frame, a second light source disposed at a second corner portion near the second corner of the frame, a third light source disposed at a third corner portion near the third corner of the frame, and a fourth light source disposed at a fourth corner portion near the fourth corner of the frame;

a reflection layer including a first opening where the first light source is located, a second opening where the second light source is located, a third opening where the third light source is located, and a fourth opening where the fourth light source is located, wherein a first folding line is formed between the first opening and the first corner, a second folding line is formed between the second opening and the second corner, a third folding line is formed between the third opening and the third corner, and a fourth folding line is formed between the fourth opening and the fourth corner;

a first light reflectance control area disposed on the reflection layer and crossing the first folding line adjacent to the first opening and configured to reduce a reflectance of light emitted by the first light source;

a second light reflectance control area disposed on the reflection layer and crossing the second folding line adjacent to the second opening and configured to reduce a reflectance of light emitted by the second light source;

a third light reflectance control area disposed on the reflection layer and crossing the third folding line adjacent to the third opening and configured to reduce a reflectance of light emitted by the third light source; and

a fourth light reflectance control area disposed on the reflection layer and crossing the fourth folding line adjacent to the fourth opening and configured to reduce a reflectance of absorb light emitted by the fourth light source,

wherein the plurality of light sources further include other light sources disposed on the frame within a boundary defined by the first corner portion, the second corner portion, the third corner portion and the fourth corner portion,

wherein the reflection layer further includes a plurality of openings where the other light sources are located,

wherein a shape of the first opening, the second opening, the third opening and the fourth opening is different than a shape of the plurality of openings where the other light sources are located, and

wherein the first opening, the second opening, the third opening and the fourth opening have a same shape.

2. The display device of claim 1, wherein each of the plurality of openings where the other light sources are located have a same shape.

3. The display device of claim 1, wherein at least two of the other light sources are misaligned with respect to at least one of the other light sources.

4. The display device of claim 1, wherein a distance between the first opening and one opening closest to the first opening in a first direction is different than a distance between the first opening and another opening closest to the first opening in a second direction.

5. The display device of claim 1, wherein the other light sources include a first set of light sources arranged in a first direction and a second set of light sources arranged in the first direction.

6. The display device of claim 5, wherein a first distance between adjacent light sources in the first set of light sources is the same, and a second distance between adjacent light sources in the second set of light sources is the same, and

wherein the first distance is different than the second distance.

7. The display device of claim 1, wherein a distance from a center of the first opening to a first edge of the first opening is different than a distance from the center of the first opening to a second edge of the first opening.

8. The display device of claim 1, wherein the first light reflectance control area partially surrounds the first light source.

9. The display device of claim 1, wherein the first light reflectance control area comprises a circular arc shape.

10. The display device of claim 1, wherein the reflection layer includes cutting portions at the corners of the reflection layer.

11. The display device of claim 1, wherein an edge of the frame includes a vertical protrusion and the reflection layer includes a cut-out corresponding to the vertical protrusion.

12. A display device comprising:

a display panel;

a frame at a rear of the display panel, the frame having a rectangular shape such that the frame includes a first corner, a second corner, a third corner and a fourth corner;

a plurality of substrates on the frame;

a plurality of light sources including a first light source disposed at a first corner portion near the first corner of the frame, a second light source disposed at a second corner portion near the second corner of the frame, a third light source disposed at a third corner portion near the third corner of the frame, and a fourth light source disposed at a fourth corner portion near the fourth corner of the frame; and

a reflection layer including at least a first opening where the first light source is located, a second opening where the second light source is located, a third opening where the third light source is located, and a fourth opening where the fourth light source is located,

wherein a first folding line is formed between the first opening and the first corner, a second folding line is formed between the second opening and the second corner, a third folding line is formed between the third opening and the third corner, and a fourth folding line is formed between the fourth opening and the fourth corner,

wherein an area of the reflection layer surrounding the first light source includes a first area and a second area, wherein the first area is disposed on the reflection layer and crossing the first folding line adjacent to the first opening,

wherein an area of the reflection layer surrounding the second light source includes a first area and a second area, wherein the first area is disposed on the reflection layer and crossing the second folding line adjacent to the second opening,

wherein an area of the reflection layer surrounding the third light source includes a first area and a second area, wherein the first area is disposed on the reflection layer and crossing the third folding line adjacent to the third opening,

wherein an area of the reflection layer surrounding the fourth light source includes a first area and a second area, wherein the first area is disposed on the reflection layer and crossing the fourth folding line adjacent to the fourth opening,

wherein the first areas and the second areas of the reflection layer reduce the reflectance of light from the first, second, third, and fourth light sources then the second areas of the reflection layer,

wherein the plurality of light sources further include other light sources disposed on the frame within a boundary defined by the first corner portion, the second corner portion, the third corner portion and the fourth corner portion,

wherein the reflection layer includes a plurality of openings where the other light sources are located,

wherein a shape of the first opening, the second opening, the third opening and the fourth opening is different than a shape of the plurality of openings where the other light sources are located, and

wherein the first opening, the second opening, the third opening and the fourth opening have a same shape.

13. The display device of claim 12, wherein the second areas of the reflection layer include the areas surrounding each of the first, second, third, and fourth light sources except for the respective first areas.

14. The display device of claim 12, wherein each of the plurality of openings where the other light sources are located have a same shape.

15. The display device of claim 12, wherein at least two of the other light sources are misaligned with respect to at least one of the other light sources.

16. The display device of claim 12, wherein a distance between the first opening and one opening closest to the first opening in a first direction is different than a distance between the first opening and another opening closest to the first opening in a second direction.

17. The display device of claim 12, wherein the other light sources include a first set of light sources arranged in a first direction and a second set of light sources arranged in the first direction.

18. The display device of claim 17, wherein a first distance between adjacent light sources in the first set of light sources is the same, and a second distance between adjacent light sources in the second set of light sources is the same, and

wherein the first distance is different than the second distance.

19. The display device of claim 12, wherein a distance from a center of the first opening to a first edge of the first opening is different than a distance from the center of the first opening to a second edge of the first opening.

20. The display device of claim 12, wherein the reflection layer includes cutting portions at the corners of the reflection layer.