Liquid crystal display device and method for displaying a landscape mode image

• US 7,859,506 B2
• Filed: 06/05/2007
• Issued: 12/28/2010
• Est. Priority Date: 06/09/2006
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Bae, Jong-Kon, Kang, Won-Sik
• Primary Examiner(s): Shalwala; Bipin
• Assistant Examiner(s): BEDELL, DANIEL J
• Application Number:
  US11/758,178
• Publication Number:
  US 20070285372A1
• Time in Patent Office: 1,302 Days
• Field of Search: None
• US Class Current: 345/99
• CPC Class Codes: G09G 2310/061 for resetting or blanking
• CPC Class Codes: G09G 2360/18 Use of a frame buffer in a display terminal, inclusive of the display panel
• CPC Class Codes: G09G 3/3655 Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors
• CPC Class Codes: G09G 3/3677 suitable for active matrices only

Abstract

A mobile LCD device controls a common voltage signal VCOM to effectively display a landscape mode image instead of using a separate integrated chip (IC). The LCD device utilizes a method of displaying a landscape mode image including selecting a video frame from M video frames received from an external source where M is greater than or equal to 2. The selected video frame is stored in a video memory. The selected video frame is masked so as not to display the selected video frame while the selected video frame is stored. The stored video frame is displayed a predetermined number of times while the selected video frame is not stored thereby effectively displaying the landscape mode image.

Claims

1. A method of displaying a landscape mode image, comprising:

selecting a video frame from M video frames received externally where M is greater than or equal to 2;

storing the selected video frame into a video memory;

masking only the selected video frame so as not to display the selected video frame in a display panel while the selected video frame is undergoing a process of being stored in the video memory;

providing common voltage signal having a regular cycle of high and low voltage levels during periods in which the selected video frame is not masked, but during periods in which the selected video frame is masked maintaining the common voltage signal at a previous high or low voltage level through a next voltage level cycle, such that the selected video frame is not displayed in the display panel while the selected video frame is undergoing a process of being stored in the video memory; and

displaying the selected video frame, which is stored in the video memory, in the display panel a predetermined number of times by cycling the voltage level of the common voltage signal the predetermined number of times after the selected video frame has been fully stored in the video memory.

2. The method of claim 1, wherein selecting the video frame further comprises:

generating an internal data enable signal between vertical synchronization signals; and

selecting the video frame based on the generated internal data enable signal in order to store the selected video frame.

3. The method of claim 2, wherein generating the internal data enable signal further comprises:

counting the M video frames;

determining the selected video frame from the M video frames based on a multiple of M; and

generating the internal data enable signal based on the multiple of M.

4. The method of claim 1, wherein masking only the selected video frame further comprises outputting a blank video frame so as not to display the selected video frame in the display panel while the selected video frame is undergoing a process of being stored in the video memory.

5. The method of claim 1, wherein when 80 video frames are received per second externally, M corresponds to 4 and the predetermined number of times corresponds to 3 so that the number of the displayed video frames is 60.

6. The method of claim 1, wherein when 60 video frames are received per second externally, M corresponds to 4 and the predetermined number of times corresponds to 4 so that the number of the displayed video frames is 60.

7. A timing controller for displaying a landscape mode image, said controller comprising:

a video memory configured to store a video frame selected from a plurality of video frames received from an external source; and

a driver controller coupled to said video memory, said driver controller configured to provide a common voltage signal having a regular cycle of high and low voltage levels during periods in which the selected video frame is not masked, but during periods in which the selected video frame is masked maintaining the common voltage signal at a previous high or low voltage level through a next voltage level cycle, such that the video frame is not displayed in a display panel while the video frame is undergoing a process of being stored into said video memory, said driver controller further configured to repeatedly display the video frame, which is stored in said video memory, in the display panel a predetermined number of times after the video frame has been fully stored in said video memory.

8. The timing controller of claim 7, further comprising:

a counter configured to count the video frames and configured to determine the video frame based on a multiple of the number of video frames so that said timing controller determines the video frame to be stored.

9. The timing controller of claim 7, wherein said driver controller masks the video frame such that the video frame is not displayed in the display panel while the video frame is undergoing a process of being stored into said video memory.

10. The timing controller of claim 9, wherein said driver controller masks the video frame to display a blank video frame.

11. The timing controller of claim 7, wherein when 80 video frames are received per second from said external source, M corresponds to 4 and the predetermined number of times corresponds to 3 so that the number of video frames displayed is 60.

12. The timing controller of claim 7, wherein when 60 video frames are received per second from said external source, M corresponds to 4 and the predetermined number of times corresponds to 4 so that the number of the displayed video frames is 60.

13. A mobile liquid crystal display (LCD) device for displaying a landscape mode image, comprising:

a display panel having a plurality of gate lines and a plurality of data lines;

a source driver coupled to said display panel and configured to drive the data lines;

a gate driver coupled to said display panel and configured to drive the gate lines of the display panel;

a driving voltage generator coupled to said gate driver and said display panel, said driving voltage generator configured to provide a common voltage signal to said display panel and further configured to provide a control voltage to the gate driver; and

a timing controller configured to control a drive timing of the source driver, the gate driver and the driving voltage generator, said timing controller having a video memory configured to store a video frame that is selected from a plurality of video frames received from an external source and a driver controller configured to provide a common voltage signal having a regular cycle of high and low voltage levels during periods in which the selected video frame is not masked, but during periods in which the selected video frame is masked maintaining the common voltage signal at a previous high or low voltage level through a next voltage level cycle, such that the video frame is not displayed in the display panel while the video frame is undergoing a process of being stored into the video memory, and configured to repeatedly display the video frame, which is stored in the video memory, in the display panel a predetermined number of times after the video frame has been fully stored in said video memory.

14. The mobile LCD device of claim 13, wherein the timing controller further comprises:

a counter configured to count the video frames and to determine the video frame based on a multiple of the number of the video frames so that the timing controller determines the video frame to be stored.

15. The mobile LCD device of claim 13, wherein the driver controller masks the video frame such that the video frame is not displayed in the display panel while the video frame is undergoing a process of being stored into said video memory.

16. The mobile LCD device of claim 15, wherein the driver controller masks the video frame to display a blank video frame.

17. The mobile LCD device of claim 13, wherein when 80 video frames are received per second from an external source, M corresponds to 4 and the predetermined number of times corresponds to 3 so that the number of video frames displayed is 60.

18. The mobile LCD device of claim 13, wherein when 60 video frames are received per second from the exterior, M corresponds to 4 and the predetermined number of times corresponds to 4 so that the number of video frames displayed is 60.