Timing of fields of video

• US 6,999,057 B2
• Filed: 02/22/2001
• Issued: 02/14/2006
• Est. Priority Date: 02/22/2000
• Status: Active Grant

• Current Assignee: Kopin Corporation
• Original Assignee: Kopin Corporation
• Inventors: Zavracky, Matthew M., Ellertson, David L.
• Primary Examiner(s): Shalwala, Bipin
• Assistant Examiner(s): Lewis, David L.
• Application Number:
  US09/792,285
• Publication Number:
  US 20020030659A1
• Time in Patent Office: 1,818 Days
• Field of Search: 345/540, 345/560, 345/87, 345/96, 345/10, 345/25, 345/581, 345467-469, 345/100, 345/428, 345/534, 345/537, 345/546, 348/569, 348441-459, 348/559, 348/521, 348/501, 348/96, 348/97, 713/400
• US Class Current: 345/100
• CPC Class Codes: G09G 2320/0204 Compensation of DC component across the pixels in flat panels
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

An apparatus and method to delay a field of video by one row in a two field frame to reduce DC build-up or stick caused by textual image.

Claims

1. A method of displaying interlaced video information on a digital display as non-interlaced video, wherein the interlaced video information includes a plurality of video frames, each video frame including a first video field and a second video field, the method comprising:

accepting the interlaced video information having a video frame with an area of demarcation on at least one row in each of the video fields;

determining that a row having the area of demarcation in the first video field does not coincide with a row having the area of demarcation in the second video field; and

adjusting the timing of at least one of the video fields so that the area of demarcation in the first video field coincides with the area of demarcation in the second video field.

2. The method of claim 1 further comprising:

selecting a row from each video field to discard based on a mismatch of the area of demarcation in the video fields.

4. The method of claim 2 wherein the selected rows are at the same offset in the inspection video fields.

5. The method of claim 1 wherein each video field is displayed sequentially on the digital display.

6. The method of claim 1 wherein the digital display includes a liquid crystal display panel.

7. The method of claim 1 wherein the area of demarcation is textual display information.

3. A method of displaying interlaced video information on a digital display, the method comprising:

accepting video data having an excess number of rows of video for the digital display;

processing the video frames of video data, with each frame having a first video field and a second video field; and

selecting a row of video data to discard from each video field based on a mismatch of information between the respective rows of the first video field and the second video field, wherein the row selected from each video field is in an area of demarcation of the display.

8. The method of claim 3 wherein the selected rows are at the same offset in the inspection video fields.

9. The method of claim 3 wherein each video field is displayed sequentially on the digital display.

10. The method of claim 3 wherein the digital display includes a liquid crystal display panel.

11. The method of claim 3 wherein the area of demarcation is textual display information.

12. A system for displaying interlaced video information on a digital display as non-interlaced video, wherein the interlaced video information includes a plurality of video frames, each video frame including a first video field and a second video field, the system comprising:

a video input circuit for accepting the interlaced video information having a video frame with an area of demarcation on at least one row in each of the video fields;

a video processor for determining that a row having the area of demarcation in the first video field does not coincide with a row having the area of demarcation in the second video field; and

a timing generator for adjusting the timing of at least one of the video fields so that the area of demarcation in the first video field coincides with the area of demarcation in the second video field.

13. The system of claim 12 wherein the video processor selects a row from each video field to discard based on a mismatch of the area of demarcation in the video fields.

14. The system of claim 12 wherein the digital display includes a liquid crystal display panel.

15. A system for displaying interlaced video information on a digital display, the system comprising:

a video input circuit for accepting video data having an excess number of rows of video for the digital display;

a video processor for processing the video frames of video data, with each frame;

having a first video field and a second video field; and

selecting a row of video data to discard from each video field based on a mismatch of information between the respective rows of the first video field and the second video field, wherein the row selected from each video field is in an area of demarcation of the display.

16. The system of claim 15 wherein the digital display includes a liquid crystal display panel.

17. A system for displaying interlaced video information on a digital display as non-interlaced video, wherein the interlaced video information includes a plurality of video frames, each video frame including a first video field and a second video field, the system comprising:

a means for accepting the interlaced video information having a video frame with an area of demarcation on at least one row in each of the video fields;

a means for determining that a row having the area of demarcation in the first video field does not coincide with a row having the area of demarcation in the second video field; and

a means for adjusting the timing of at least one of the video fields so that the area of demarcation in the first field coincides with the area of demaracation in the second video field.