DISPLAY DEVICE

• US 20130300680A1
• Filed: 10/24/2012
• Published: 11/14/2013
• Est. Priority Date: 05/08/2012
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Kim, Sung-Chul, Kim, Tae-Soo, Yoo, Jae-Myong, Kim, Ung-Sik
• Granted Patent: US 9,368,759 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: H10K 50/86 Arrangements for improving contrast, e.g. preventing reflection of ambient light
• CPC Class Codes: H10K 59/40 OLEDs integrated with touch screens
• CPC Class Codes: H10K 59/8791 Arrangements for improving contrast, e.g. preventing reflection of ambient light
• CPC Class Codes: H10K 59/8793 Arrangements for polarized light emission H10K59/8791 takes precedence

Abstract

A display device includes a display unit for displaying an image, a first retarder provided on the display panel, a first polarizing plate provided on the first retarder, a touch unit provided on the first polarizing plate, a second retarder provided on the touch unit, and a second polarizing plate provided on the second retarder. With this arrangement, external light entering into the display may either be transmitted or reflected off of the touch unit, and in either case, be absorbed by the second polarizing plate without leaving the display device.

Claims

1. A display device comprising:

a display unit to display an image;

a first retarder arranged on the display panel;

a first polarizing plate arranged on the first retarder;

a touch unit arranged on the first polarizing plate;

a second retarder arranged on the touch unit; and

a second polarizing plate arranged on the second retarder.

2. The display device of claim 1, wherein the display unit includes a first electrode, an organic emission layer, and a second electrode that are sequentially stacked.

3. The display device of claim 1, wherein the first retarder is a ¼

wave plate, and the second retarder is a ½

wave plate.

4. The display device of claim 3, wherein

an intersection angle between a polarization axis of the second polarizing plate and a polarization axis of the first polarizing plate is 90 degrees,

an intersection angle between an optical axis of the second retarder and an optical axis of the first retarder is 90 degrees, and

an intersection angle between the optical axis of the first retarder and the polarization axis of the first polarizing plate is 45 degrees.

5. The display device of claim 4, wherein

the polarization axis of the second polarizing plate is a predetermined θ

degrees,

the optical axis of the second retarder has an angle of (θ

+45) degrees,

the polarization axis of the first polarizing plate has an angle of (θ

+90) degrees, and

the optical axis of the first retarder has an angle of (θ

+90)+45 degrees.

6. The display device of claim 3, wherein

an intersection angle between a polarization axis of the second polarizing plate and a polarization axis of the first polarizing plate is 90 degrees,

an intersection angle between an optical axis of the second retarder and an optical axis of the first retarder is 0 degrees, and

an intersection angle between an optical axis of the first retarder and a polarization axis of the first polarizing plate is −

45 degrees.

7. The display device of claim 6, wherein

the polarization axis of the second polarizing plate is a predetermined θ

degrees,

the optical axis of the second retarder has an angle of (θ

+45) degrees,

the polarization axis of the first polarizing plate has an angle of (θ

+90) degrees, and

the optical axis of the first retarder has an angle of (θ

+90)−

45 degrees.

8. The display device of claim 3, further including an adhesive layer between the first polarizing plate and the touch unit.

9. The display device of claim 8, wherein a refractive index of the adhesive layer has a value between a refractive index of the first polarizing plate and a refractive index of the touch unit.

10. The display device of claim 1, further including a window provided on the second polarizing plate.