Touch sensing optical system and display device including the same

• US 9,857,616 B2
• Filed: 08/17/2015
• Issued: 01/02/2018
• Est. Priority Date: 09/12/2014
• 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, Kang-Min, Kim, Seon Ki, Kim, Tae Hyung, Sung, Jeong Min, Yim, Hyung Woo, Song, Jin Oh, Yun, Hae Young
• Primary Examiner(s): Moon, Seokyun
• Application Number:
  US14/828,474
• Publication Number:
  US 20160077368A1
• Time in Patent Office: 869 Days
• Field of Search: None
• CPC Class Codes: G02B 30/25 using polarisation techniques
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133528 Polarisers
• CPC Class Codes: G02F 1/1337 Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/13731 based on a field-induced phase transition G02F1/13781 takes precedence
• CPC Class Codes: G06F 2203/04111 Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
• CPC Class Codes: H04N 13/305 using lenticular lenses, e.g. arrangements of cylindrical lenses

Abstract

An optical system includes: a first panel including a plurality of first electrodes extending in a first direction; a second panel facing the first panel and including a plurality of second electrodes extending in a second direction crossing the first direction; an optical conversion layer between the first panel and the second panel; and a first insulating layer between the first electrodes and the second electrodes, the first insulating layer including an organic material, wherein, in a touch mode, one or more of the first electrodes and one or more of the second electrodes crossing each other form a touch sensing capacitor, and wherein, in a multi-view mode, the first electrodes and the second electrodes apply an electric field to the optical conversion layer, the electric field depending on a voltage difference between the first electrode and the second electrode, to generate different phase differences.

Claims

1. An optical system comprising:

a first panel comprising a plurality of first electrodes extending in a first direction;

a second panel facing the first panel and comprising a plurality of second electrodes extending in a second direction crossing the first direction;

an optical conversion layer between the first panel and the second panel; and

a first insulating layer between the first electrodes and the second electrodes,

wherein, in a touch mode, one or more of the first electrodes and one or more of the second electrodes crossing each other form a touch sensing capacitor configured to sense a touch,

wherein, in a multi-view mode, the first electrodes and the second electrodes are configured to apply an electric field to the optical conversion layer, the electric field depending on a voltage difference between the first electrode and the second electrode, to generate different phase differences according to positions along the optical system, and

wherein the first insulating layer functions as a dielectric material of the touch sensing capacitor and includes an organic material to reduce a capacitance of the touch sensing capacitor for improving sensitivity of the touch sensing capacitor.

2. The optical system of claim 1, wherein a dielectric constant of the first insulating layer is between about 2.5 and about 3.5.

3. The optical system of claim 2, wherein a thickness of the first insulating layer is greater than a thickness of the optical conversion layer.

4. The optical system of claim 3, wherein the first insulating layer is between the first electrodes and the optical conversion layer.

5. The optical system of claim 4, wherein the optical conversion layer comprises a liquid crystal layer.

6. The optical system of claim 1, wherein the optical system further comprises:

a first driver configured to apply a common voltage to the plurality of first electrodes in the multi-view mode and to apply a touch input voltage to the plurality of first electrodes in the touch mode; and

a second driver configured to apply different voltages to adjacent ones of the second electrodes in the multi-view mode and to receive a touch output voltage from the second electrode in the touch mode.

7. The optical system of claim 6, wherein, in the touch mode, the plurality of first electrodes are sequentially supplied with the touch input voltage.

8. The optical system of claim 1, further comprising at least one alignment layer disposed on at least one of an inner surface of the first panel and an inner surface of the second panel, respectively.

9. The optical system of claim 1, further comprising:

a cover window on the second panel, and

a polarizer disposed between the cover window and the second electrodes,

wherein the cover window is tempered.

10. The optical system of claim 1, wherein

the second panel comprising a tempered substrate or a polarizer.

11. The optical system of claim 1, wherein the first direction and the second direction form an obtuse angle.

12. A display device comprising:

a display panel;

an optical system over the display panel; and

a graphics controller configured to control the display panel and the optical system,

wherein the optical system comprises;

a first panel comprising a plurality of first electrodes extending in a first direction;

a second panel facing the first panel and comprising a plurality of second electrodes extending in a second direction crossing the first direction;

an optical conversion layer between the first panel and the second panel; and

a first insulating layer between the first electrodes and the second electrodes and substantially completely overlapping or covering the first electrodes or the second electrodes in an area corresponding to a display area of the display panel,

wherein, in a touch mode, one or more of the first electrodes and one or more of the second electrodes crossing each other form a touch sensing capacitor,

wherein, in a multi-view mode, the first electrodes and the second electrodes are configured to apply an electric field to the optical conversion layer, the electric field depending on a voltage difference between the first electrode and the second electrode, to generate different phase differences according to positions along the optical system, and

wherein the first insulating layer functions as a dielectric material of the touch sensing capacitor and includes an organic material to reduce a capacitance of the touch sensing capacitor for improving sensitivity of the touch sensing capacitor.

13. The display device of claim 12, wherein a dielectric constant of the first insulating layer is between about 2.5 and about 3.5.

14. The display device of claim 13, wherein a thickness of the first insulating layer is greater than a thickness of the optical conversion layer.

15. The display device of claim 14, wherein the first insulating layer is between the first electrodes and the optical conversion layer.

16. The display device of claim 12, wherein the optical system further comprising:

a first driver configured to apply a common voltage to the plurality of first electrodes in the multi-view mode and to apply a touch input voltage to the plurality of first electrodes in the touch mode; and

a second driver configured to apply different voltages to adjacent ones of the second electrodes in the multi-view mode and to receive a touch output voltage from the second electrode in the touch mode.

17. The display device of claim 16, wherein, in the touch mode, the plurality of first electrodes are sequentially supplied with the touch input voltage in the touch mode.

18. The display device of claim 12, further comprising a cover window on the second panel,

wherein the cover window is tempered.

19. The display device of claim 12, wherein the second panel further comprising a tempered substrate or a polarizer.

20. The display device of claim 12, further comprising an optical system controller configured to receive a mode selection signal from the graphics controller to control the optical system,

wherein the display panel comprising a display controller configured to receive the mode selection signal from the graphics controller.