Peep-proof display apparatus and driving method thereof

• US 8,988,643 B2
• Filed: 04/15/2013
• Issued: 03/24/2015
• Est. Priority Date: 09/04/2012
• Status: Active Grant

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Yang, Chih-Hsiang, Yeh, Chao-Wei, Fan, Chen-Feng, Liao, Chien-Huang, Hsu, Wen-Hao
• Primary Examiner(s): CALEY, MICHAEL H
• Application Number:
  US13/862,548
• Publication Number:
  US 20140063386A1
• Time in Patent Office: 708 Days
• Field of Search: 349/33, 349/141
• US Class Current: 349/141
• CPC Class Codes: G02F 1/1323 Arrangements for providing a switchable viewing angle
• CPC Class Codes: G02F 1/13306 Circuit arrangements or driving methods for the control of single liquid crystal cells G02F1/132, G02F1/133382 take precedence
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/134381 Hybrid switching mode, i.e. for applying an electric field with components parallel and orthogonal to the substrates
• CPC Class Codes: G09G 2300/023 Display panel composed of stacked panels
• CPC Class Codes: G09G 2300/0447 for multi-domain technique to improve the viewing angle in a liquid crystal display, such as multi-vertical alignment [MVA]
• CPC Class Codes: G09G 3/36 using liquid crystals

Abstract

A peep-proof display apparatus includes a plurality of sub-pixels disposed between a first substrate and a second substrate. Each sub-pixel includes a first conductive layer, a color filter layer, an isolation film, a light modulator layer, a second conductive layer, an insulation film and a third conductive layer. The color filter layer is disposed between the first conductive layer and the isolation film. The light modulator layer is disposed between the isolation film and the second conductive layer. The insulation film is disposed between the second and third conductive layers. In a first display mode, the light modulator layer is applied with an electric field parallel thereto. In a second display mode, the light modulator layer is applied with an electric field parallel thereto and an electric field perpendicular thereto.

Claims

1. A driving method of a peep-proof display apparatus, the peep-proof display apparatus comprising a plurality of sub-pixels, each one of the sub-pixels comprising a first conductive layer, an isolation film, a light modulator layer, a second conductive layer, an insulation film and a third conductive layer, the first conductive layer comprising two surfaces and on one of which a first substrate is disposed, the isolation film being disposed on another surface of the first conductive layer, the light modulator layer comprising a plurality of liquid crystal, the light modulator layer being disposed between the isolation film and the second conductive layer, the insulation film being disposed between the second and third conductive layers, and a second substrate being disposed on another surface of the third conductive layer, comprising:

applying a first voltage to both of the first and third conductive layers and a second voltage to the second conductive layer in a first display mode;

applying an electric field, parallel to the light modulator layer, and an electric field, perpendicular to the light modulator layer, to the light modulator layer in a second display mode; and

applying a voltage difference between the first and third conductive layers in the second display mode,

wherein the second voltage is a data voltage of an image grayscale and the second voltage is configured to have polarities varying with frame periods.

2. The driving method according to claim 1, wherein the first voltage is a DC voltage.

3. The driving method according to claim 1, further comprising:

applying the first voltage to the first conductive layer, the second voltage to the second conductive layer and a third voltage to the third conductive layer in the second display mode.

4. The driving method according to claim 1, further comprising:

applying the first voltage to the first conductive layer, a third voltage to the second conductive layer and the second voltage to the third conductive layer in the second display mode.

5. The driving method according to claim 1, further comprising:

applying a third voltage to the first conductive layer, the second voltage to the second conductive layer and the first voltage to the third conductive layer in the second display mode.

6. The driving method according to claim 3, wherein the third voltage is configured to have polarities varying with frame periods.

7. The driving method according to claim 4, wherein the third voltage is configured to have polarities varying with frame periods.

8. The driving method according to claim 5, wherein the third voltage is configured to have polarities varying with frame periods.