Method, apparatus, and system for controlling three dimensional displays

• US 9,396,687 B2
• Filed: 08/14/2013
• Issued: 07/19/2016
• Est. Priority Date: 08/24/2012
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Wu, Yanbing, Zhang, Lilei
• Primary Examiner(s): Eisen, Alexander
• Assistant Examiner(s): Yang, Nan-Ying
• Application Number:
  US13/966,509
• Publication Number:
  US 20140055336A1
• Time in Patent Office: 1,070 Days
• US Class Current: 1/1
• CPC Class Codes: G09G 3/36 using liquid crystals
• CPC Class Codes: H04N 13/31 using parallax barriers
• CPC Class Codes: H04N 13/398 Synchronisation thereof; Control thereof

Abstract

Method, apparatus, and system for controlling three dimensional displays are provided. The method comprises: acquiring a current time when a liquid crystal raster device is driven by a AC driving voltage signal; shutting down a backlight source when the current time is within a setting period of time included in an input period of the AC driving voltage signal, wherein the setting period of time refers to a period during which a polarity of the AC driving voltage signal changes such that an image crosstalk is generated when the backlight source is in a normal-open state. Since the backlight source is shut down and stops providing backlight to the panel when the current time is within the setting period, the panel displays black thereby left eye and right eye images are prevented from entering into error regions of view, the image crosstalk is reduced and a display quality is improved.

Claims

1. A method for controlling three dimensional displays, comprising:

acquiring a current time when a liquid crystal raster device is driven to shield light by an alternating current driving voltage signal;

shutting down a backlight source when the current time is within a setting period of time included in an input period of the alternating current driving voltage signal, wherein the setting period of time refers to a period of time during which a polarity of the alternating current driving voltage signal changes from positive polarity to negative polarity or from negative polarity to positive polarity such that an image crosstalk is generated when the backlight source is in a normal-open state, wherein the transmittance of the liquid crystal raster device when the alternating current driving voltage signal maintains its polarity is lower than the transmittance of the liquid crystal raster device when the polarity of the alternating current driving voltage signal changes from positive polarity to negative polarity or from negative polarity to positive polarity,

wherein the image crosstalk occurs as a left eye of a viewer views lights emitted from a right eye sub-pixel and a right eye of the viewer views lights emitted from a left eye sub-pixel as the transmittance of the liquid crystal raster device rises when the polarity of the alternating current driving voltage signal changes from positive polarity to negative polarity or from negative polarity to positive polarity.

2. The method of claim 1, wherein the setting period of time is obtained from a transmittance threshold or a brightness threshold of a light shielded area in the liquid crystal raster device, the transmittance threshold is a critical value which results in an image crosstalk, and the brightness threshold is a critical value which results in the image crosstalk.

3. The method of claim 1, wherein the frequency of the alternating current driving voltage signal is smaller than a setting frequency threshold.

4. The method of claim 1, wherein the setting period of time is within a period of time during which one row of sub-pixels or one column of sub-pixels in the display panel is scanned.

5. An apparatus for controlling three dimensional displays, comprising:

an acquisition unit for acquiring a current time when a liquid crystal raster device is driven to shield light by an alternating current driving voltage signal;

a shutting-down unit for shutting down a backlight source when the current time is within a setting period of time included in an input period of the alternating current driving voltage signal, wherein the setting period of time refers to a period of time during which a polarity of the alternating current driving voltage signal changes from positive polarity to negative polarity or from negative polarity to positive polarity such that an image crosstalk is generated when the backlight source is in a normal-open state, wherein the transmittance of the liquid crystal raster device when the alternating current driving voltage signal maintains its polarity is lower than the transmittance of the liquid crystal raster device when the polarity of the alternating current driving voltage signal changes from positive polarity to negative polarity or from negative polarity to positive polarity,

wherein the image crosstalk occurs as a left eye of a viewer views lights emitted from a right eye sub-pixel and a right eye of the viewer views lights emitted from a left eye sub-pixel as the transmittance of the liquid crystal raster device rises when the polarity of the alternating current driving voltage signal changes from positive polarity to negative polarity or from negative polarity to positive polarity.

6. The apparatus of claim 5, wherein the setting period of time is obtained from a transmittance threshold or a brightness threshold of a light shielded area in the liquid crystal raster device, the transmittance threshold is a critical value which results in an image crosstalk, and the brightness threshold is a critical value which results in the image crosstalk.

7. The apparatus of claim 5, wherein the frequency of the alternating current driving voltage signal is smaller than a setting frequency threshold.

8. The apparatus of claim 5, wherein the set period of time is within a period of time during which one row of sub-pixels or one column of sub-pixels in the display panel is scanned.

9. A system for controlling three dimensional displays, comprising:

a display panel;

a backlight source located on a light incident side of the display panel;

a liquid crystal raster device located on a light outgoing side of the display panel or between the backlight source and the display panel;

a control module, connected with the backlight source, the liquid crystal raster device and the display panel, respectively, for acquiring a current time when the liquid crystal raster device is driven to shield light by an alternating current driving voltage signal and shutting down the backlight source when the current time is within a setting period of time included in an input period of the alternating current driving voltage signal, wherein the setting period of time refers to a period of time during which a polarity of the alternating current driving voltage signal changes from positive polarity to negative polarity or from negative polarity to positive polarity such that an image crosstalk is generated when the backlight source is in a normal-open state, wherein the transmittance of the liquid crystal raster device when the alternating current driving voltage signal maintains its polarity is lower than the transmittance of the liquid crystal raster device when the polarity of the alternating current driving voltage signal changes from positive polarity to negative polarity or from negative polarity to positive polarity,

wherein the image crosstalk occurs as a left eye of a viewer views lights emitted from a right eye sub-pixel and a right eye of the viewer views lights emitted from a left eye sub-pixel as the transmittance of the liquid crystal raster device rises when the polarity of the alternating current driving voltage signal changes from positive polarity to negative polarity or from negative polarity to positive polarity.

10. The system of claim 9, wherein the liquid crystal raster device is a liquid crystal parallax barrier.