Sony Corporation

Sony Corpotation

Yoshiki Shirochi

Hideo Morita

Shigeo Kubota

Naoya Katoh

Hiroshi Yamashita

Koichiro Kakinuma

Shuichi Haga

Takehiro Nakatsue

Junichi Iwai

Ko Ishimoto

Tatsuhiko Matsumoto

Yoshihiro Kosugi

Hiroshi Takizuka

Koichi Oura

Kazuji Uemura

Yoshio Suzuki

Naoki Kamaya

Hiroaki Endo

Seizi Sato

Takeshi Tanimoto

Sou Miyasaka

Keiichi Nito

Hiroyuki Shiota

Hirokazu Nakayoshi

Hirokazu Takaoka

Hiroshi Mamiya

Takao Takahashi

Tomoya Yano

Takashi Kinoshita

Keitaro Yamashita

Shigeki Ohno

Koichi Katagawa

Akira Shirahama

Toshihiko Numakura

Isao Saito

Noboru Motoyoshi

Hiroshi Yamagata

Hideaki Kawaura

Yuji Nagata

Yoshiro Muraoka

Kazumasa Miyazaki

Hiroshi Hiraki

Makio Iida

Tetsuji Kikuchi

Masami Toriduka

Toshinari Fuchigami

Signals are provided which allow colors in a wider color range than predetermined standards, which can be handled by apparatus according to such predetermined standards. A primary color converter converts first color signals having primary color points in a wider color range than the primary color points according to BT.709 into second color signals based on the primary colors according to BT.709. A photoelectric transducer converts the second color signals into third color signals according to photoelectric transducer characteristics defined in a numerical range wider than a range from 0 to 1.0 of color signals corresponding to a luminance signal and color difference signals according to BT.709. A color signal converter converts the third color signals into a luminance signal and color difference signals. A corrector incorporated in the color signal converter corrects the color difference signals into color difference signals.

Signal processing apparatus and method, and program

A liquid crystal driver is provided, in which a frame rate of an input image signal is multiplied byN (N is an integer of one or more); each frame is divided into N positive field(s) and N negative field(s) respectively; the image signal is supplied to a liquid crystal panel with a positive polarity in a positive field; and the image signal is supplied to the liquid crystal panel with a negative polarity in a negative field. The liquid crystal driver includes a corrected image signal generator configured to generate a corrected image signal having the same amount of correction added to the positive field and negative field. The corrected image signal is supplied to the liquid crystal panel with the positive polarity in the positive field and the corrected image signal is supplied to the liquid crystal panel with the negative polarity in the negative field.

Liquid crystal driver, liquid crystal driving method and liquid crystal display device

A picture display apparatus exploiting a liquid crystal display is disclosed. This picture display apparatus () includes an interpolator (), an over-drive unit (), an angle of visibility improvement unit (), and a source driver () for driving a liquid crystal display panel (). The interpolator converts the picture rate upwardly. The angle of visibility improvement unit () converts an input picture signal into a picture signal representing a grayscale level of the input picture signal by synthesis of liquid crystal transmittances of a plural number of temporally consecutive fields. Specifically, the angle of visibility improvement unit converts the input picture signal to a picture signal made up of a first field set to a signal value related with a high grayscale level and a second field set to a signal value related with a low grayscale level. In case time changes of the grayscale level have occurred in the input picture signal at the same spatial position, the over-drive unit () corrects the driving level for a signal value of one or both of the first and second fields depending on response of the liquid crystal.

Picture display apparatus and method

A display image correcting device including, retaining section configured to retain reference correction amount data for correcting nonuniformity as a predetermined factor of an image displayed on a basis of a video signal, the reference correction amount data representing an amount of correction at a predetermined horizontal and vertical position of the image, the amount of correction being obtained in correspondence with a video signal level as a reference, and correcting section configured to perform correction processing on the video signal in correspondence with a horizontal direction and a vertical direction of the image, and a brightness direction, and performing the correction processing on a basis of three-dimensional correction amount data obtained by making two-dimensional correction amount data corresponding to a horizontal and vertical position, the two-dimensional correction amount data being obtained on a basis of the reference correction amount data, linearly proportional or nonlinearly proportional to level of the video signal to be corrected.

Display image correcting device, image display device, and display image correcting method

Signals are provided which allow colors in a wider color range than predetermined standards, which can be handled by apparatus according to such predetermined standards. A primary color converter converts first color signals having primary color points in a wider color range than the primary color points according to BT.709 into second color signals based on the primary colors according to BT.709. A photoelectric transducer converts the second color signals into third color signals according to photoelectric transducer characteristics defined in a numerical range wider than a range from 0 to 1.0 of color signals corresponding to a luminance signal and color difference signals according to BT. 709. A color signal converter converts the third color signals into a luminance signal and color difference signals. A corrector incorporated in the color signal converter corrects the color difference signals into color difference signals.

Linear chromaticity conversion is used to perform color reproduction of a liquid crystal display (LCD) compatible with a cathode ray tube (CRT). An inputted signal is subjected to processing similar to processing used in the CRT display. A light source chromaticity conversion processing portion carries out a &#x3b3; correction to the signal in a &#x3b3; operation portion by using &#x3b3;=&#x3b3;crt of the same nonlinear characteristics as the CRT, and performs an operation of a chromaticity conversion matrix in a matrix operation portion. An LCD inverse &#x3b3; correction portion uses &#x3b3;establishing &#x3b3;_lcd=&#x3b3;lcd/&#x3b3;=1 to perform an inverse &#x3b3; correction to the inputted signal. An LCD &#x3b3; characteristic operation portion performs a &#x3b3; correction using &#x3b3; characteristics of the LCD to the signal inputted from the LCD inverse &#x3b3; correction portion, outputs a picture signal, and causes an image to be displayed on the LCD.

Chromaticity conversion device and chromaticity conversion method

Provided is a projection type liquid crystal display apparatus, which can improve black-level display and thus can display a higher-contrast image as compared to the related art. An optical compensator is located on the light exit side with respect to the liquid crystal display device so as to compensate for the optical phase difference caused by liquid crystal molecules in a light-entry-side region of the liquid crystal layer. As the optical compensator is located on the light exit side with respect to the liquid crystal display device, birefringence, caused by the liquid crystal molecules present in the light-entry-side region, is compensated for without being influenced by a microlenses provided in the liquid crystal plane. Consequently, the apparatus can improve the black-level display and thus can display a higher-contrast image as compared to the related art. Further, a phase difference caused by the birefringence of the nematic liquid crystal molecule is compensated for by using a substance having properties optically opposite to the positive crystal, namely, a substance having birefringence equivalent to birefringence of a negative crystal.

Apparatus and method for displaying image

A liquid crystal projector apparatus is presented, which can display an image free from an influence of a temperature variation of a liquid crystal panel without the necessity to directly measure the temperature of the liquid crystal panel. The liquid crystal projector apparatus includes a temperature sensor for detecting a temperature at a location in the liquid crystal projector apparatus except liquid crystal panels, a memory for storing temperature detection data obtained by the temperature sensor within a period from a power supply starting time to a steady operation entering time, an arithmetic operation device for estimating a temperature of each of the liquid crystal panels based on the temperature detection data stored in the memory, and liquid crystal drive sections for correcting drive voltages for driving the liquid crystal panels with output signals of the arithmetic operation device.

Liquid crystal projector apparatus and driving method for liquid crystal projector apparatus

Image data of the respective colors are converted, by look-up tables in which &ggr; correction data are stored, into gradation data that are white-balanced with intervention of the V-T characteristics of liquid crystal panels. The generated gradation data are supplied to D/A converters and the liquid crystal panels via liquid crystal driving circuits. Gamma correction data within dynamic ranges that are set for each display apparatus by measuring a luminance ratio and contrast ratios of the respective colors are written to the look-up tables in advance. As a result, all they correction data stored in the look-up tables can be used effectively. The invention is directed to such a method for generating data of look-up tables and an image display apparatus that performs gradation correction by using thus-formed look-up tables.

Display apparatus and method for gamma correction

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Chiba, Japan

Yoshiki Shirochi