Crystal display device
AssigneeSharp Kabushiki Kaisha
InventorsMichiyuki Sugino, Yuji Kikuchi, Toshihiko Osada, Takashi Yoshii, Makoto Shiomi
Life of this patent
Estimating the term…
Abstract
An edge detecting circuit detects whether a particular pixel belongs to an edge by determining whether the differential value of the pixel from the neighboring pixel is equal to or greater than a threshold. Based on the detection result, an emphasis converter stops OS drive when the image of a pixel area is regarded as an edge image in accordance with the detected result of the edge detecting circuit and implements OS drive when the image of a pixel area is not regarded as an edge image. In this way, the edge detecting circuit detects edge portions of the input video, whereby OS drive in the emphasis converter can be controlled so as to be turned on and off.
Claims12
A liquid crystal display for image display using a liquid crystal display panel, comprising:
- an emphasis converter for determining emphasis-converted data for input image data for compensating an optical characteristic of the liquid crystal display panel, in accordance with a gray scale level transition from a previous vertical period to a current vertical period;
- a characteristic quantity detector for detecting a signal characteristic quantity with respect to an edge component or a noise component contained in the input image data;
- and
- a selector for selecting either the emphasis-converted data or the input image data, based on the detected signal characteristic quantity and supplying the selected one as display image data to the liquid crystal display panel.
A liquid crystal display for image display using a liquid crystal display panel, comprising:
- an emphasis converter for determining emphasis-converted data for input image data for compensating an optical characteristic of the liquid crystal display panel, in accordance with a gray scale level transition from a previous vertical period to a current vertical period;
- a characteristic quantity detector for detecting a signal characteristic quantity with respect to an edge component or a noise component contained in the input image data;
- and
- a controller which variably controls the emphasis-converted data from the emphasis converter, based on the detected signal characteristic quantity and outputs the resultant controlled emphasis-converted data to the liquid crystal display panel.
Dependencies are inferred from the claim text.