Display device for touch sensing and 3-dimensional image display, and driving method thereof

• US 8,976,137 B2
• Filed: 11/26/2012
• Issued: 03/10/2015
• Est. Priority Date: 05/09/2012
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Goo, Nam-Hee, Kim, Ji Woong, Kim, Chul, Bae, Yu-Han, Lee, Byoung Jun
• Primary Examiner(s): Liang, Regina
• Application Number:
  US13/684,868
• Publication Number:
  US 20130300705A1
• Time in Patent Office: 834 Days
• Field of Search: 345/173, 345/174, 345/419, 178/18.01, 178/18.03
• US Class Current: 345/173
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/13471 in which all the liquid crystal cells or layers remain transparent, e.g. FLC, ECB, DAP, HAN, TN, STN, SBE-LC cells G02F1/13475 takes precedence
• 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

Abstract

A touch barrier panel having a touch sensing capability and a 3-dimensional image display capability is disposed on a display panel such that manufacturing cost may be reduced and the thickness thereof is relatively thin. Also, the negative liquid crystal that is not affected by the vertical electric field is used such that a mode change speed and response speed may be improved.

Claims

1. A display device comprising:

a display panel;

a touch barrier panel disposed on the display panel, and comprising a plurality of upper electrodes, a plurality of lower electrodes, a liquid crystal layer disposed between the upper electrodes and the lower electrodes, a first polarizer, and a second polarizer, the touch barrier panel being operable both in a touch sensing mode and a 3-dimensional image display mode; and

a touch barrier panel controller,

wherein the plurality of upper electrodes are arranged in a first direction, and the plurality of lower electrodes are arranged in a second direction crossing the first direction, the plurality of upper electrodes are extended to cross the plurality of lower electrodes with the liquid crystal layer interposed therebetween,

wherein the touch barrier panel controller is configured to apply voltages to the upper electrodes to operate in the 3-dimensional image display mode, and

wherein the touch barrier panel controller is configured to apply voltages to one of the upper electrodes and the lower electrodes and detects a change in voltages of the other one of the upper electrodes and the lower electrodes to operate in the touch sensing mode.

2. The display device of claim 1,

the liquid crystal layer comprises negative liquid crystal molecules that are horizontally arranged in the absence of an electric field.

3. The display device of claim 2, wherein

the touch barrier panel is a normally white mode panel.

4. The display device of claim 3, wherein

in the touch sensing mode, the touch barrier panel controller is configured to sense a touch based on a change of a voltage of a liquid crystal capacitor formed by the lower electrode, the liquid crystal layer, and the upper electrode.

5. The display device of claim 4, wherein

the touch barrier panel controller is configured to sense the touch by sensing a change of a voltage exerted at the upper electrode according to the voltage applied to the lower electrode.

6. The display device of claim 3, further comprising another upper electrode,

wherein, in the 3-dimensional image display mode, the touch barrier panel controller is configured to apply a high voltage to the upper electrode and a lower voltage to the another upper electrode.

7. The display device of claim 6, wherein

the lower electrode is floated.

8. The display device of claim 6, wherein

light is transmitted in a portion where adjacent upper electrodes are applied with the same voltage, and light is blocked in a portion where adjacent upper electrodes are applied with different voltages.

9. The display device of claim 3, wherein

the touch barrier panel controller drives the touch panel in the touch sensing mode and the 3-dimensional image display mode in a time divisional manner.

10. The display device of claim 9, wherein

the touch sensing mode is performed in a blank period.

11. The display device of claim 3, wherein

the touch barrier panel further comprises an upper plane electrode.

12. The display device of claim 3, wherein

the display panel is a liquid crystal panel, and

the display panel and the touch barrier panel share a second polarizer.

13. The display device of claim 12, wherein

the upper substrate of the display panel and the lower substrate of the touch barrier panel are the same unit.

14. The display device of claim 13, wherein

the second polarizer is disposed as an inner polarizer.

15. The display device of claim 1, wherein

the liquid crystal layer comprises positive liquid crystal molecules that are vertically arranged in the absence of an electric field.

16. A method of driving a display device comprising a display panel and a touch barrier panel operable both in a touch sensing mode and a 3-dimensional image display mode, wherein the touch barrier panel comprises a plurality of upper electrodes arranged in a first direction, a plurality of lower electrodes arranged in a second direction crossing the first direction, and a liquid crystal layer disposed between the upper electrodes and the lower electrodes, the method comprising:

determining whether the touch sensing mode is in an on state;

determining whether the 3-dimensional image display mode is in the on state;

operating the touch barrier panel in the touch sensing mode by applying voltages to one of the upper electrodes and the lower electrodes and detecting a change in voltages of the other one of the upper electrodes and the lower electrodes; and

operating the touch barrier panel in the 3-dimensional image display mode by applying voltages to the upper electrodes.

17. The driving method of claim 16, wherein

the touch sensing mode is performed in a blank period.

18. The method of claim 16, wherein

when the touch sensing mode is in the on state, the touch barrier panel senses the touch based on a change of a voltage of a liquid crystal capacitor formed by the lower electrode, the liquid crystal layer, and the upper electrode.

19. The method of claim 16, wherein

when the 3-dimensional image mode is in the on state, a high voltage is applied to the upper electrode, and a low voltage is applied to another upper electrode.

20. The method of claim 19, wherein

when the 3-dimensional image mode is in the on state, the lower electrode is floated.