Image display apparatus, signal processing apparatus, image processing method

Abstract

An image display device includes the following elements. A frame controller divides the input image frame in a time-division manner to generate a plurality of sub-frames. The high-frequency enhanced sub-frame generator performs filtering processing on the multiple sub-frames generated by the frame controller to generate high-frequency enhanced sub-frames. The high-frequency suppression sub-frame generator performs filtering processing on the plurality of sub-frames generated by the frame controller to generate high-frequency suppression sub-frames. The output controller alternately outputs the high-frequency enhancement sub-frame and the high-frequency suppression sub-frame. The display unit performs frame steady-state display processing and alternately displays the high-frequency enhanced sub-frame and the high-frequency suppressed sub-frame 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 capable of displaying an image on a frame-hold-type display such as a liquid crystal display by performing a process for converting an interlaced signal into a progressive signal. Interlaced to progressive (interface-to-progressive, IP) conversion to reduce blurring. The invention also relates to a signal processing device, an image processing method, and a computer program product for use in an image display device. Background technique [0002] In display processing with a flat panel display (FPD) using organic electroluminescence (EL) or liquid crystal (LC), frame-steady display is performed, unlike a cathode ray tube (CRT) that drives display using dot-sequential pulses. That is, in a typical FPD operation with a frame frequ...

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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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