Abstract: A video processing apparatus for converting frame rates of video signals includes: a video characteristic detection unit (29) that detects, from an input video signal, as characteristics of the video signal, whether or not the video signal is of a film material and/or whether or not character information is displayed in the video signal; and an interpolation phase calculation unit (21) to a merge unit (28) that constitute an image generation unit that uses the characteristics detected by the video characteristic detection unit, to generate an intermediate frame image having a phase different from the phase of an input frame image of the video signal. In accordance with the characteristics detected by the characteristic detection unit, the image generation unit moves the phase of the intermediate frame image to a phase different from a logical interpolation phase determined based on an input frame frequency and an output frame frequency.

Abstract: An interpolation processing section determines a pixel value of an interpolation-target pixel by a diagonal interpolation process. An interpolation value limiting section compensates the pixel value determined by the interpolation processing section such that it becomes a value between pixel values of two adjacent pixels above and below the interpolation-target pixel. An intersection area detecting section judges whether or not the interpolation-target pixel is located in, when the horizontal axis represents a horizontal position and the vertical axis represents a pixel value, an area in proximity of a horizontal position where a curve line, representing pixel values of pixels on the scanning line above the interpolation-target pixel, and a curve line, representing pixel values of pixels on the scanning line below the interpolation-target pixel, intersects.

Abstract: A video processing apparatus for converting frame rates of video signals includes: a video characteristic detection unit (29) that detects, from an input video signal, as characteristics of the video signal, whether or not the video signal is of a film material and/or whether or not character information is displayed in the video signal; and an interpolation phase calculation unit (21) to a merge unit (28) that constitute an image generation unit that uses the characteristics detected by the video characteristic detection unit, to generate an intermediate frame image having a phase different from the phase of an input frame image of the video signal. In accordance with the characteristics detected by the characteristic detection unit, the image generation unit moves the phase of the intermediate frame image to a phase different from a logical interpolation phase determined based on an input frame frequency and an output frame frequency.

Abstract: When displaying moving images by using liquid crystal panels and others, a problem exists in that tail streaks occur, and image degradation is resultantly caused. To solve this problem, an echo suppression circuit divides a video signal into a pair composed of two successive frames for comparison between these two frames in signal level for the purpose of suppressing an echo phenomenon occurring when a liquid crystal panel displays video signals including moving images. If these two frames are not the same in signal level, the signal is accordingly corrected so as to equalize the signal level of these frames. Based on the video signals and others corrected by the echo suppression circuit, a controller operates the liquid crystal panel with AC drive through a source driver and a gate driver. As such, the drive voltage used to operate the liquid crystal panel with AC drive is adjusted so as to be balanced between positive and negative.

Abstract: Gamma converter circuits use first to third types of first and second gamma-characteristics to gamma-convert an input video signal. Selectors select one pair among three pairs of gamma-characteristics in accordance with a transmittance to be used for display, and selects one of the six gamma corrected outputs such that both a distribution area ratio of pixels driven by the video signal as gamma corrected by use of the first gamma-characteristic of the selected pair of gamma characteristics and a distribution area ratio of pixels driven by the video signal as ? corrected by use of the second gamma-characteristic of the selected pair of gamma-characteristics are equal to a distribution area ratio specified in advance for the selected pair of gamma-characteristics.

Abstract: An interpolation processing section detects an angle of an edge in an image, and based on the detected angle, determines a pixel value of an interpolation target pixel in an oblique area in which there is an oblique edge by performing oblique interpolation, and determines a pixel value of an interpolation target pixel in a non-oblique area which is an area excluding the oblique area by performing vertical interpolation. A nonuniform sharpening section performs sharpening processing, in a direction vertical to a scanning line, more strongly for the non-oblique area in the image for which a scanning line has been interpolated by the interpolation processing section, than for the oblique area. Thus, unnaturalness at the boundary between, of the edge whose angle gradually varies, a part for which oblique interpolation has been performed and a part for which vertical interpolation has been performed, can be reduced.

Abstract: An interpolation processing section determines a pixel value of an interpolation-target pixel by a diagonal interpolation process. An interpolation value limiting section compensates the pixel value determined by the interpolation processing section such that it becomes a value between pixel values of two adjacent pixels above and below the interpolation-target pixel. An intersection area detecting section judges whether or not the interpolation-target pixel is located in, when the horizontal axis represents a horizontal position and the vertical axis represents a pixel value, an area in proximity of a horizontal position where a curve line, representing pixel values of pixels on the scanning line above the interpolation-target pixel, and a curve line, representing pixel values of pixels on the scanning line below the interpolation-target pixel, intersects.

Abstract: A signal converting section increases a transfer rate of an input image signal to be supplied to a liquid crystal panel and, at the same time, also inserts a non-image signal for applying a predetermined voltage to liquid-crystal cells in a space of the input image signal and supplies it as a picture-element signal to a source driver. To each picture cell, an input image signal and a non-image signal are sequentially written with positive or negative polarity. For all picture elements, after the input image signal is written, the non-image signal equal in polarity to the input image signal is always written. Furthermore, after the non-image signal is written, an image signal opposite in polarity to the non-image signal is always written. Thus, when an image is displayed on the liquid crystal panel in OCB mode, it is possible to prevent the occurrence of back transition and carry out image display evenly.

Abstract: An image display apparatus and method provided for visually improving a sense of contrast by adjusting contrast and a light source to have a correlation. A characteristics detection part detects MAX, MIN, and APL (average) of an input signal. A control data generation part calculates Gain for amplifying a difference between MAX and MIN to a width of a dynamic range and Offset indicating the DC level to be shifted so that the input video signal amplified by Gain falls within the output dynamic range of a DC level adjustment part. A signal amplitude adjustment part amplifies the input video signal with reference to APL and in accordance with Gain. The DC level adjustment part shifts the DC level of the amplified input video signal in accordance with a value of Offset. A light source control part controls a light source so that a visual brightness level on a screen is equal to a brightness level of the input video signal.

Abstract: An image display apparatus and method are provided for visually improving a sense of contrast by adjusting contrast and a light source to have a correlation. A characteristics detection part detects MAX, MIN, and APL (average) of an input signal. A control data generation part calculates Gain for amplifying a difference between MAX and MIN to a width of a dynamic range and Offset indicating the DC level to be shifted so that the input video signal amplified by Gain falls within the output dynamic range of a DC level adjustment part. A signal amplitude adjustment part amplifies the input video signal with reference to APL and in accordance with Gain. The DC level adjustment part shifts the DC level of the amplified input video signal in accordance with a value of Offset. A light source control part controls a light source so that a visual brightness level on a screen is equal to a brightness level of the input video signal.

Abstract: When displaying moving images by using liquid crystal panels and others, a problem exists in that tail streaks occur, and image degradation is resultantly caused. To solve this problem, an echo suppression circuit divides a video signal into a pair composed of two successive frames for comparison between these two frames in signal level for the purpose of suppressing an echo phenomenon occurring when a liquid crystal panel displays video signals including moving images. If these two frames are not the same in signal level, the signal is accordingly corrected so as to equalize the signal level of these frames. Based on the video signals and others corrected by the echo suppression circuit, a controller operates the liquid crystal panel with AC drive through a source driver and a gate driver. As such, the drive voltage used to operate the liquid crystal panel with AC drive is adjusted so as to be balanced between positive and negative.

Abstract: When displaying moving images by using liquid crystal panels and others, a problem exists in that tail streaks occur, and image degradation is resultantly caused. To solve this problem, an echo suppression circuit divides a video signal into a pair composed of two successive frames for comparison between these two frames in signal level for the purpose of suppressing an echo phenomenon occurring when a liquid crystal panel displays video signals including moving images. If these two frames are not the same in signal level, the signal is accordingly corrected so as to equalize the signal level of these frames. Based on the video signals and others corrected by the echo suppression circuit, a controller operates the liquid crystal panel with AC drive through a source driver and a gate driver. As such, the drive voltage used to operate the liquid crystal panel with AC drive is adjusted so as to be balanced between positive and negative.

Abstract: A ?1A converter circuit 1a and a ?2A converter circuit 2a to a ?1C converter circuit 1c and a ?2C converter circuit 2c use first to third types of first and second ?-characteristics to ?-convert an input video signal IS. Selectors 3 to 5 select one pair among three pairs of ?-characteristics in accordance with a transmittance to be used for display, and selects one of the six ?-corrected outputs such that both a distribution area ratio of pixels driven by the video signal as ? corrected by use of the first ?-characteristic of the selected pair of ?-characteristics and a distribution area ratio of pixels driven by the video signal as ? corrected by use of the second ?-characteristic of the selected pair of ?-characteristics are equal to a distribution area ratio specified in advance for the selected pair of ?-characteristics.

Abstract: A liquid crystal display apparatus is provided with a detecting section (108) for detecting a value of a parameter that causes fluctuations in a back transition occurrence condition; a calculating section (106) for determining, in accordance with the detection value of the detecting section, at least one of a ratio of an time period of applying a high voltage with respect to one frame period, the high voltage being applied to the liquid crystal panel in order to prevent back transition, a magnitude of the high voltage, and an applied voltage corresponding to white display; and a controller (104) for alternately outputting a video signal and a non-image signal for applying the high voltage and driving the liquid crystal panel on a condition in accordance with the determination result of the calculating section. With this, it is possible to always display video irrespectively of fluctuation in the back transition occurrence condition.

Abstract: A liquid crystal display device includes a signal conversion part (101), a drive pulse generation part (102), a source driver (103), a gate driver (1704), and a multiplexer part (1706). In addition, between the source driver (103) and a display region part (1705) there is provided an intersection part (204) where, when source lines (S1, S2, S3, S4, . . . ) in the display region part are divided into groups each including four source lines, lines that correspond to two source lines (S2 and S3) located the second and third from an end in each group intersect each other. With the liquid crystal display device using the multiplexer part for switching a plurality of source lines in a time-sharing manner, the degradation of the display quality of pixels caused by, for example, an insufficient writing capability to the pixels is improved.

Abstract: A doubler part doubles frequencies of video signals. A drive control circuit generates, in response to a synchronizing signal outputted from the doubler part, PWM dimming frequency information such that a PWM dimming frequency f and a black display ratio B satisfy the relationships f?25B+250 and B>10, and provides such information to a PWM dimming signal generation circuit. In addition, the drive control circuit drives a gate driver and a source driver such that one frame period is divided into an image display period and a black display period. The PWM dimming signal generation circuit generates, in response to a synchronizing signal and the PWM dimming frequency information, a PWM dimming signal and provides the PWM dimming signal to a lighting circuit. The lighting circuit activates a backlight device with dimming, in response to the PWM dimming signal.

Abstract: A frequency converting section (101), which is included in a liquid crystal display apparatus, generates an output video signal by inserting one non-image signal, which is to be concurrently written into pixels on L (L is an integer equal to or greater than two) gate lines of the liquid crystal panel, for one line, between image signals composing an input video signal, for corresponding L lines, and adjusting a number of horizontal scanning periods of the output video signal in a vertical blanking period so that a number of horizontal scanning periods composing one frame period is (L+1)×(2N+1) (N is an integer). Thus, when anti-back-transition driving is performed using a liquid crystal panel in OCB mode, it is possible to minimize increase in a driving frequency, prevent irregularity of brightness caused by AC driving of the liquid crystal panel, and reduce a cost.

Abstract: A liquid crystal display device capable of suppressing the occurrence of a back transition in OCB cells and displaying excellent images as well as a driving method thereof are provided. One frame period has a first period P1 for writing a signal for initializing the state of a liquid crystal in pixel cells and a second period for writing pixel data in correspondence with an image signal in pixel cells, and a voltage level to be applied to each pixel cell is set in the first period such that each pixel cell retains a voltage Vsup higher than that in the second period.

Abstract: A signal converting section increases a transfer rate of an input image signal to be supplied to a liquid crystal panel and, at the same time, also inserts a non-image signal for applying a predetermined voltage to liquid-crystal cells in a space of the input image signal and supplies it as a picture-element signal to a source driver. To each picture cell, an input image signal and a non-image signal are sequentially written with positive or negative polarity. For all picture elements, after the input image signal is written, the non-image signal equal in polarity to the input image signal is always written. Furthermore, after the non-image signal is written, an image signal opposite in polarity to the non-image signal is always written. Thus, when an image is displayed on the liquid crystal panel in OCB mode, it is possible to prevent the occurrence of back transition and carry out image display evenly.

Abstract: A signal converting section increases a transfer rate of an input image signal to be supplied to a liquid crystal panel and, at the same time, also inserts a non-image signal for applying a predetermined voltage to liquid-crystal cells in space of the input image signal and supplies it as a picture-element signal to a source driver. To each picture cell, an input image signal and a non-image signal are sequentially written with positive or negative polarity. For all picture elements, after the input image signal is written, the non-image signal equal in polarity to the input image signal is always written. Furthermore, after the non-image signal is written, an image signal opposite in polarity to the non-image signal is always written. Thus, when an image is displayed on the liquid crystal panel in OCB mode, it is possible to prevent the occurrence of back transition and carry out image display evenly.