Image display apparatus, signal processing apparatus, image processing method, and computer program product

Abstract

An image display apparatus includes the following elements. A frame controller divides an input image frame in a time-division manner to generate a plurality of sub-frames. A high-frequency-enhanced sub-frame generator performs filtering processing on the plurality of sub-frames generated by the frame controller to generate high-frequency-enhanced sub-frames. A high-frequency-suppressed sub-frame generator performs filtering processing on the plurality of sub-frames generated by the frame controller to generate high-frequency-suppressed sub-frames. An output controller alternately outputs the high-frequency-enhanced sub-frames and the high-frequency-suppressed sub-frames. A display unit performs frame-hold-type display processing and alternately displays the high-frequency-enhanced sub-frames and the high-frequency-suppressed sub-frames output from the output controller.

Description

Technical field [0001] The present invention generally relates to image display devices, signal processing devices, image processing methods, and computer program products. More specifically, the present invention relates to an image display device which, when displaying an image on a frame-hold-type display such as a liquid crystal display, can be used to convert an interlaced signal into a progressive signal. Interlace to progressive (interface-to-progressive, IP) conversion to reduce the appearance of blurring. The present invention also relates to a signal processing device, an image processing method, and a computer program product used in an image display device. Background technique [0002] Unlike a cathode ray tube (CRT) that uses a dot sequence pulse drive display, a frame steady state display is performed in a display process using a flat panel display (FPD) using organic electroluminescence (EL) or liquid crystal (LC). That is, in a typical FPD operation with a frame ...

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Problems solved by technology

[0007] However, in the configuration disclosed in Japanese Patent Unexamined Application Publication No. 2005-128488, there is a trade-off relationship between pulse driving and brightness or contrast, and it is difficult to avoid a certain degree of reduction in brightness or contrast

In the configuration disclosed in Japanese Patent Unexamined Application Publication No. 2005-173387, even if appropriate distribution of luminance components between time-divided subframes is performed, depending on the luminance level of the original frame pixel, sufficient effects may not be obtained

In addition, it is necessary to set time-division frames whose pixel values ​​have a brightness level lower than that of the pixel values ​​composing the original image, and in this case, if the brightness level of the original frame pixels is low, it is difficult to set time-division with appropriate pixel values frame

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