Image display unit

• US 7,400,321 B2
• Filed: 10/07/2004
• Issued: 07/15/2008
• Est. Priority Date: 10/10/2003
• Status: Active Grant

• Current Assignee: JVC Kenwood Corporation
• Original Assignee: Victor Company of Japan Limited (JVC Kenwood Corporation)
• Inventors: Aiba, Hideki, Kubota, Kenji
• Primary Examiner(s): Shalwala, Bipin
• Assistant Examiner(s): Chowdhury, Afroza Y
• Application Number:
  US10/959,078
• Publication Number:
  US 20050078069A1
• Time in Patent Office: 1,377 Days
• Field of Search: 345/204
• US Class Current: 345/204
• CPC Class Codes: G09G 2320/0252 Improving the response speed
• CPC Class Codes: G09G 2320/0257 Reduction of after-image effects
• CPC Class Codes: G09G 2320/0261 in the context of movement of objects on the screen or movement of the observer relative to the screen
• CPC Class Codes: G09G 2320/106 Determination of movement vectors or equivalent parameters within the image
• CPC Class Codes: G09G 2340/0435 Change or adaptation of the frame rate of the video stream
• CPC Class Codes: G09G 2340/16 Determination of a pixel data signal depending on the signal applied in the previous frame
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: H04N 7/0132 the field or frame frequency of the incoming video signal being multiplied by a positive integer, e.g. for flicker reduction
• CPC Class Codes: H04N 7/014 involving the use of motion vectors motion estimation and compensation in video coding H04N19/51

Abstract

An active matrix type display panel is a hold type display panel which has a plurality of pixels arranged in a matrix form, and holds and displays an electrical signal pixel by pixel for a predetermined time. A frame rate conversion circuit converts a video signal having a first vertical frequency (60 Hz) into a video signal having a second vertical frequency (120 Hz) which is m/n-fold (wherein m is an integer of 2 or more, n is an integer of 1 or more, and conditions of m>n are satisfied) of the first vertical frequency. A time base emphasizing circuit subjects an output from the frame rate conversion circuit to time base emphasis. A drive circuit displays the video signal having the second vertical frequency in a display panel.

Claims

1. An image display unit using an active matrix type display panel which has a plurality of pixels arranged in a matrix form, and holds and displays an electrical signal pixel by pixel for a predetermined time, comprising:

a rate conversion circuit which converts a video signal having a first vertical frequency into a video signal having a second vertical frequency which is m/n-fold (wherein m is an integer of 2 or more, n is an integer of 1 or more, and conditions of m>

n are satisfied) of the first vertical frequency, and outputs the converted signal;

a time base emphasizing circuit which emphasizes a high-zone component in a direction of the time base by using image data corresponding to at least two adjacent frames in the video signal having the second vertical frequency output from the rate conversion circuit; and

a drive circuit which displays the video signal having the second vertical frequency output from the rate conversion circuit in the active matrix type display panel,

wherein the rate conversion circuit comprises;

an image memory which writes the video signal having the first vertical frequency and outputs the written video signal as the video signal having the second vertical frequency;

a motion vector detection circuit which detects a motion vector by using image data output from the image memory; and

first and second interpolation circuits which perform motion compensation interpolation by using the image data output from the image memory and the motion vector, and output respective image data each being a video signal having the second vertical frequency and shifted as much as one frame from the other, and

the time base emphasizing circuit emphasizes the high-zone component in the direction of the time base by using the respective image data output from the first and second interpolation circuits as the image data corresponding to the at least two adjacent frames.

2. An image display unit using an active matrix type display panel which has a plurality of pixels arranged in a matrix form, and holds and displays an electrical signal pixel by pixel for a predetermined time, comprising:

a rate conversion circuit which converts a video signal having a first vertical frequency into a video signal having a second vertical frequency which is m/n-fold (wherein m is an integer of 2 or more, n is an integer of 1 or more, and conditions of m>

n are satisfied) of the first vertical frequency, and outputs the converted signal;

a time base emphasizing circuit which emphasizes a high-zone component in a direction of the time base by using image data corresponding to at least two adjacent frames in the video signal having the second vertical frequency output from the rate conversion circuit; and

a drive circuit which displays the video signal having the second vertical frequency output from the rate conversion circuit in the active matrix type display panel, wherein the rate conversion circuit comprises;

an image memory which writes the video signal having the first vertical frequency and outputs the written video signal as the video signal having the second vertical frequency;

a motion vector detection circuit which detects a motion vector by using image data output from the image memory;

an interpolation circuit which performs motion compensation interpolation by using the image data output from the image memory and the motion vector, and outputs the video signal having the second vertical frequency; and

first and second selectors which output respective image data each being shifted as much as one frame from the other by selectively outputting the image data output from the image memoly and the image data output from the interpolation circuit, and

the time base emphasizing circuit emphasizes the high-zone component in the direction of the time base by using the respective image data output from the first and second selectors as the image data corresponding to the at least two adjacent frames.