Canon Kabushiki Kaisha

Teppei Kurosawa

Masayuki Abe

Jun Koide

Yuya Kurata

Abe Masayuki

The image signal generating apparatus for a liquid crystal display element. A corner detector detects, when an input image signal contains multiple frame images each of which includes a first image area having a first tone and including a corner portion and a second image area having a second tone higher than the first tone and being adjacent in vertical, horizontal and oblique directions to the corner portion, the corner portion in each frame image, a tone provider generates an output image signal by providing a third tone lower than the second tone to one specific pixel adjacent in the oblique direction to a vertex of the corner portion in at least one of the multiple frame images. The tone provider provides the third tone to the specific pixel when the input image signal is a moving image signal.

Image signal generating apparatus, liquid crystal display apparatus, method of generating image signal and storage medium storing image signal generating program

A liquid crystal display apparatus includes a feature amount generator configured to generate a feature amount based on the number of pixel pairs that satisfy a correspondence relationship between a gradation value of a target pixel and a gradation value of a surrounding pixel around the target pixel for a image represented by an input image signal, a processor configured to provide processing so as to set a correction value that reduces a dynamic range of a gradation value of the input image signal when the feature amount is larger than a first threshold, and so as not to set the correction value when the feature amount is equal to or smaller than the first threshold, and a liquid crystal driver configured to drive a liquid crystal display element based on the input image signal that has been corrected by the correction value.

Liquid crystal display apparatus and program used for the same

A liquid crystal display apparatus is disclosed which can prevent occurrence of flicker regardless of display modes. The apparatus includes a liquid crystal modulation element which includes a liquid crystal layer between a first electrode and a second electrode, a controller which controls a potential difference to be applied between the first and second electrodes. The apparatus operates in first and second modes, which are different in the light amount entering the element. A memory stores first information for the first mode and second information for the second mode as controlling information on a potential difference between the electrodes for suppressing flicker within a certain range. The controller controls the potential difference between the electrodes based on the first information when the first mode is set and controls the potential difference between the electrodes based on the second information when the second mode is set.

Liquid crystal display projector and method of controlling the same

A liquid crystal display device includes a liquid crystal modulation element including a first electrode, a second electrode, and a liquid crystal layer, a potential difference providing unit that provides a potential difference between the first electrode and the second electrode, and an illumination optical system that illuminates the liquid crystal modulation element by using light from a light source. The liquid crystal display device includes a charge adjusting mode for reducing the intensity of an electric field generated by electric charge stored between the liquid crystal layer and at least one of the first electrode and the second electrode.

Image display device with liquid crystal modulation elements

A liquid crystal display apparatus includes a liquid crystal modulation element having a liquid crystal layer and first and second electrodes, and a controller performs control for an electric potential difference applied between the electrodes such that an electric field applied to the liquid crystal layer is inverted between positive and negative. The controller switches the control between first control and second control. The first control controls the electric potential difference such that one of an absolute value of a time-integrated value of the positive electric field applied to the liquid crystal layer and an absolute value of a time-integrated value of the negative electric field applied thereto is larger than the other, and the second control controls the electric potential difference such that the other absolute value of the time-integrated value is larger than the one absolute value of the time-integrated value.

Liquid crystal display apparatus

A liquid crystal display apparatus is disclosed which can prevent occurrence of flicker for a long time. The apparatus comprises a liquid crystal modulation element which includes a first electrode, a second electrode made of a material different from that of the first electrode, a liquid crystal layer disposed between the first and second electrodes, a first alignment film disposed between the first electrode and the liquid crystal layer, and a second alignment film disposed between the second electrode and the liquid crystal layer. The apparatus also comprises a controller which changes at least one of the potential to be applied to the first electrode and the central potential of the potential to be applied to the second electrode, which periodically changes between positive and negative with respect to the central potential, such that flicker is suppressed within a certain range.

Growing community of inventors

Utsunomiya, Japan

Teppei Kurosawa