Sharp Kabushiki Kaisha Corporation

Takayuki Murai

Kohji Fujiwara

Hideki Ichioka

Tomohiko Yamamoto

Masaaki Moriya

Naoko Kondoh

Makoto Shiomi

Yuji Tanaka

Katsuya Otoi

Yoshimitsu Murahashi

Takao Muroi

Kingfoong Lew

A liquid crystal display device includes a backlight, a first liquid crystal panel, a second liquid crystal panel, and a driver. The second liquid crystal panel is overlapped with the first liquid crystal panel, and disposed closer to the backlight than to the first liquid crystal panel. The driver is configured to drive the backlight, the first liquid crystal panel, and the second liquid crystal panel. The second liquid crystal panel is lower in resolution than the first liquid crystal panel. The driver drives the first liquid crystal panel and the second liquid crystal panel at different refresh rates.

Liquid crystal display device

A multiple-frame detecting unit performs a prescribed detection process by taking the time corresponding to a plurality of unit images of the video signal. A video change detecting unit detects a change in video between the unit images of the video signal. If no change in the video is detected by the video change detecting unit, a correction unit performs a correction process with a first correction intensity on the video signal corresponding to a detection target image area in the unit images of the detection process being performed by the multiple-frame detecting unit, and a correction process with a second correction intensity on the video signal corresponding to an image area other than the detection target image area. When the video change detecting unit detects the change in the video, the correction unit performs the correction process with the second correction intensity on the video signal.

Video processing device

A video processing device detects, as a characteristic region, a region having a prescribed characteristic in each frame of a video and performs specific image processing on either the characteristic region in the frame or a region other than the characteristic region in the frame with a specified processing strength. The processing strength is specified so as to be altered stepwise in at least two steps that involve an intermediate value between a minimum value and a maximum value when there is a change in whether or not a characteristic region has been detected.

The light emitting device is divided into a plurality of areas, and has, as main configuration elements, an area drive circuit (), which generates LED data and LCD data, an LED controller (), and a backlight unit (), which is provided with a plurality of LEDs () corresponding to each of the areas. The power calculating unit of the LED controller () is mainly configured of a power calculating circuit (), a power limiter circuit (), and a limit value updating circuit (), and the emission power to be supplied to each of the LEDs () is calculated for each are on the basis of image data. The power calculating unit performs the calculation such that the sum (Psum) of the emission power does not exceed a power limit value (Plimit) currently set, and updates the power limit value (Plimit) by following a previously set pattern.

Light emitting device for image display, and image display device

A micon unit () performs, along at least one direction within the plane of planar light, brightness correction processing for adjusting brightness distribution of the planar light on light source color video signals (RSd, Gsd and BSd) so as to change them into light source color video signals (RSd', GSd&#x2032; and BSd&#x2032;), and the micon unit () further calculates the total light emission power of all LEDs () based on the light source color video signals (RSd&#x2032;, GSd&#x2032; and BSd&#x2032;), and performs, when the total light emission power exceeds an allowable light emission power, light emission power correction processing on the light source color video signals (RSd&#x2032;, GSd&#x2032; and BSd&#x2032;).

Illumination device, display device, data generation method, non-transitory computer readable recording medium including data generation program for generating light amount adjustment data based on temperature

A multi-display device includes an image-display-light emitting backlight which includes a light emitting element arranged in each of a plurality of areas to emit light to form planar light; and a light emission controller configured or programmed to generate emission luminance data, for each of the areas, to drive the light emitting element. The light emission controller includes a luminance correcting controller configured or programmed to correct the emission luminance data on the basis of installation directions of image display devices and connection information that is information on connection positions thereof.

Multi-display device and image display device

Specifically provided is a light emitting device for image display, wherein each of light emitting elements, a PWM control unit which PWM-controls a current to be supplied to the light emitting element, a control condition setting unit which, according to the APL of image data, determines and updatably sets the PWM limiting condition for limiting the PWM value that is the duty ratio of the PWM control, and the reference current value that is the value of the current flowing to the light emitting element in response to turn-on of the PWM control, and a PWM value calculation unit which on the basis of the image data, the PWM limit condition, and the reference current value, calculates the PWM value of each area, and the PWM control unit performs the PWM control on the basis of the reference current value and the calculated PWM value.

Light emitting device for image display, image display apparatus, and LED driver

Provided is a backlight unit () which includes a plurality of LEDs (). The LEDs () are two-dimensionally disposed, thereby having the collection of light emitted from the LEDs () in a state of planar light. Furthermore, the backlight unit () has the planar light divided into a plurality of sections, and includes a luminance variable system (for instance, a system having disposition which a difference in the density of LEDs ()), which can change luminance, corresponding to each section.

Illuminating apparatus and display apparatus

In order to display an image with a high contrast ratio while suppressing power consumed by a multi-display device and to adjust brightness of images displayed on image display devices, the multi-display device includes light emission APL value adjusting means. The light emission APL value adjusting meanssends, to light emission control means, a light emission APL value that has been adjusted, on the basis of light emission APL values calculated by light emission APL value calculating means of image display devicesto, so that total light emission power value of image-display light-emitting meansdoes not exceed an allowable power value and images are displayed at predetermined brightness.

A backlight unit according to the present invention includes a plurality of LED drivers () to (), an LED controller () that generates a control information group in which lighting control information for selected LED drivers is arranged and a cascade line that connects the LED drivers in cascade. The LED controller () enables the selected LED drivers (), and feeds the control information group to the cascade line, and the enabled LED drivers () perform an operation (acquisition operation) of acquiring the lighting control information on itself among the control information group whereas the LED drivers () that are not enabled do not perform the acquisition operation. According to the present invention, it is possible to reduce the performance of unnecessary operations of the backlight unit. The present invention can be utilized in a liquid crystal display device that uses LEDs as a light source of backlight.

Driver device, backlight unit and image display device

Under management by a main microcomputer, an LED controller performs, along at least two directions within a plane of planar light formed by LEDs arranged in a matrix, brightness correction processing for adjusting the distribution of brightness of the planar light on light source color video signals to convert them into light source color video signals.

Illumination device, display device, data generation method, data generation program and recording medium

A method is disclosed for controlling a light source installed in a liquid crystal display device. An embodiment includes a liquid crystal display panel for displaying an image by virtue of having liquid crystals whose orientation changes in response to application of a voltage; a backlight unit with a built-in PWM light modulation type LED for emitting light to be supplied to the liquid crystal display panel; and a control unit for controlling the liquid crystal display panel and the backlight unit. When the response speed of liquid crystal molecules is relatively high, the LED is driven at a relatively low drive frequency, and when the response speed of the liquid crystal molecules is relatively low, the LED is driven at a relatively high drive frequency.

In a method of controlling power of a light emitting device for image display that irradiates illumination light from divided regions, light emission brightness data of each light emitting element of the light emitting device is determined based on image data for image display (S). Power in each region and total light emission power are computed based on the light emission brightness data of each light emitting element for each region (S). If the computed total light emission power exceeds predetermined allowable power, the power in each region is limited so that the total light emission power is equal to or less than the predetermined allowable power (S).

Power control method of light emitting device for image display, light emitting device for image display, display device and television receiver

A PLL as a clock generation circuit that generates a PWM clock based on a reference clock, which PWM clock is used for controlling, in a pulse width modulation method, a lamp on time and a lamp off time of a light source illuminating a liquid crystal panel by synchronizing with a video signal that performs display in a set period on the liquid crystal panel, includes a configuration that generates a PWM clock that can maintain a fixed ratio of the lamp on time to the lamp off time within one period even if the set period is changed, by changing a pulse interval of the reference clock in conjunction with the change in the set period.

Clock generation circuit, light source control circuit, and display device

There is provided an image display device capable of suppressing the occurrence of a color shift while ensuring a sufficient color reproduction range. An in-area maximum luminance obtaining unit () divides an input image () into a plurality of areas and obtains, for each of RGB colors, a maximum luminance value () in each area. A weighting coefficient calculating unit () obtains the maximum luminance values () for the respective RGB colors for all of the areas, and determines weighting coefficients () which are required upon an LED luminance adjustment process, based on an mean value of the maximum luminances values () for each color. An LED luminance adjusting unit () adjusts the luminances of respective RGB color LEDs in each area to suppress the occurrence of a color shift, based on the maximum luminance values () obtained by the in-area maximum luminance obtaining unit () and the weighting coefficients () determined by the weighting coefficient calculating unit ().

Growing community of inventors

Osaka, Japan

Takayuki Murai