Abstract: The LED display system includes LED displays arranged in a matrix and a control device to control the LED displays. Each LED display includes a first display part including first LEDs provided on a display surface for displaying video, a second display part including at least one second LED provided on the other surface, a luminance measurement part to measure the luminance of the second LED, a first driving part to drive each first LED, and a second driving part to drive the second LED. The control device computes a luminance drop characteristic for each of the driving conditions on the basis of the luminance of the second LED, and corrects a luminance of the video on the basis of one luminance drop characteristic and the accumulative lighting-up time. The control device performs control to cause the LED displays to display the video after the correction of the luminance.

Abstract: Provided is a display device that individually corrects luminance of an image to be displayed in a part of an image display area and an image to be displayed in the other area. The display device includes a display unit to display an entire image, and a luminance correction controller to correct luminance of the entire image. The entire image is an image in which a first image displayed in a first display area being an area except a second display area is superimposed by a second image displayed in the second display area that is set in a part of the image display area. The luminance correction controller respectively corrects the luminance of the first and second images by using the first and second luminance correction coefficients. The display unit displays first and the second images each having corrected luminance respectively in the first and second display areas.

Abstract: In an LED display system, an object of the present invention is to provide a technique capable of suppressing power consumption of a plurality of LED display devices by synchronizing power saving control by each controller. Each controller includes a control circuit, a signal line, an average brightness value communication unit, and a video signal distribution unit. The control circuit calculates an average brightness value Yave of pixels constituting a frame and generates a READY signal. The average brightness value communication unit outputs the average brightness value to the signal line after detecting the completion of calculation of the average brightness values of all the controllers. The control circuit calculates a common brightness correction coefficient Cy based on the average brightness value Yave. The video signal distribution unit distributes the video signal and the common brightness correction coefficient Cy to the single LED unit.

Abstract: An object is to provide a technique capable of suppressing power consumption of a plurality of LED display devices in an LED display system including a controller and an LED display device. The controller includes a control circuit and a video signal distribution unit. The control circuit calculates an average brightness value Yave of pixels constituting a frame, and calculates the brightness correction coefficient Cy based on the average brightness value Yave so that the power consumption of the single LED unit becomes equal to or lower than a predetermined value. The video signal distribution unit distributes the video signal and the brightness correction coefficient Cy to the single LED unit. The single LED unit includes a plurality of LEDs, a brightness adjustment unit, and an LED drive unit. The brightness adjustment unit adjusts the brightness of the video signal based on the brightness correction coefficient Cy.

Abstract: A display device of the present invention includes a first display unit, a second display unit, a lighting time storage configured to store first cumulative lighting times of the of first light emitting elements of the first display unit, a light receiving unit configured to measure luminance of the second light emitting elements, a luminance transition storage configured to associate the luminance of the second light emitting elements with a second cumulative lighting time and store thereof, and a luminance corrector configured to correct luminance of the first light emitting elements based on the first cumulative lighting time, the luminance of the second light emitting elements, and the second cumulative lighting time.

Abstract: Provided is a display device that individually corrects luminance of an image to be displayed in a part of an image display area and an image to be displayed in the other area. The display device includes a display unit to display an entire image, and a luminance correction controller to correct luminance of the entire image. The entire image is an image in which a first image displayed in a first display area being an area except a second display area is superimposed by a second image displayed in the second display area that is set in a part of the image display area. The luminance correction controller respectively corrects the luminance of the first and second images by using the first and second luminance correction coefficients. The display unit displays first and the second images each having corrected luminance respectively in the first and second display areas.

Abstract: An object is to provide a technique capable of suppressing a power consumption of an LED. An LED display device includes voltage supply parts, which can supply a multiple types of voltages being different from each other and a driver which drives an LED display using the multiple types of voltages. The driver switches a combination of an LED array in a lighting target group which is one of the plurality of groups being subject to lighting-up and the multiple types of voltages which should be supplied in parallel with the LED array, under a time sharing control, and turns on some LEDs, which should be turned on by the voltages which should be supplied to the LED array, in the plurality of LEDs included in the LED array in the lighting target group.

Abstract: In an LED display system, an object of the present invention is to provide a technique capable of suppressing power consumption of a plurality of LED display devices by synchronizing power saving control by each controller. Each controller includes a control circuit, a signal line, an average brightness value communication unit, and a video signal distribution unit. The control circuit calculates an average brightness value Yave of pixels constituting a frame and generates a READY signal. The average brightness value communication unit outputs the average brightness value to the signal line after detecting the completion of calculation of the average brightness values of all the controllers. The control circuit calculates a common brightness correction coefficient Cy based on the average brightness value Yave. The video signal distribution unit distributes the video signal and the common brightness correction coefficient Cy to the single LED unit.

Abstract: The LED display device includes a display part including a display module including a plurality of LED elements, a first temperature detecting part, first and second aging display parts including at least one measurement LED element equivalent to the LED elements, a luminance measurement part measuring a luminance of the measurement LED elements, a second temperature detecting part, an accumulated lighting time storage part storing accumulated lighting times of the plurality of LED elements, a luminance decreasing rate storage part storing a relationship between an accumulated lighting time of the measurement LED elements and a luminance decreasing rate of the measurement LED elements, and a luminance correction coefficient calculating part calculating the luminance correction coefficient with reference to the plurality of LED elements, in which the luminance correction coefficient calculating part corrects the luminance correction coefficient based on the temperatures detected by the first and second tempera

Abstract: A light-emitting diode display device includes: a display that includes a light-emitting diode; a drive unit that drives the light-emitting diode; a lighting time storage unit; a first temperature detection unit; a first temperature storage unit; an aging display that includes a measurement light-emitting diode; a drive unit that drives the measurement light-emitting diode; a drive data generation unit; a second temperature detection unit; a second temperature storage unit; a brightness measurement unit that measures brightness of the measurement light-emitting diode; a brightness reduction rate storage unit; a compensation factor calculation unit that finds a compensation factor from the cumulative lighting time and the brightness reduction rate, and corrects the compensation factor on the basis of a difference between the first temperature and the second temperature; and a brightness compensation circuit that compensates the brightness of the light-emitting diode on the basis of the compensation factor.

Abstract: An object is to provide a technique capable of suppressing a power consumption of an LED. An LED display device includes voltage supply parts, which can supply a multiple types of voltages being different from each other and a driver which drives an LED display using the multiple types of voltages. The driver switches a combination of an LED array in a lighting target group which is one of the plurality of groups being subject to lighting-up and the multiple types of voltages which should be supplied in parallel with the LED array, under a time sharing control, and turns on some LEDs, which should be turned on by the voltages which should be supplied to the LED array, in the plurality of LEDs included in the LED array in the lighting target group.

Abstract: An LED display device includes a first display unit including a plurality of LED elements, a second display unit including a measurement LED element equivalent to the LED element included in the first display unit, a luminance measurement unit to measure a luminance of the measurement LED element, a luminance decrease rate storage unit to store therein a luminance decrease rate of the measurement LED element, an accumulated lighting time estimation unit to estimate an accumulated lighting time at intervals of a predetermined time, an average duty ratio storage unit to store therein an average duty ratio obtained by dividing the accumulated lighting time which is estimated, by an accumulated operating time, and a luminance correction coefficient calculation unit to obtain a luminance decrease rate with reference to the luminance decrease rate storage unit and the average duty ratio storage unit and calculate a luminance correction coefficient from the luminance decrease rate.

Abstract: A light source control device includes a constant-current circuit that collectively supplies a current to a plurality of LEDs, a current detection circuit that divides the plurality of LEDs into groups and detects a current amount of a current supplied to each of the groups, and a microcomputer that detects an open fault in the LEDs on the basis of a ratio of the current amount in each of the groups and controls a current supplied from the constant-current circuit to be reduced in a case where an open fault is detected in the LEDs.

Abstract: An LED display apparatus includes a first LED display including a first LED, a second LED display including a second LED, and a luminance corrector. The luminance corrector corrects a luminance of the first LED in accordance with a first cumulative lighting period of the first LED and with both luminance transitions and a second cumulative lighting period of the second LED.

Abstract: An LED display apparatus includes a first LED display including a first LED, a second LED display including a second LED, and a luminance corrector. The luminance corrector corrects a luminance of the first LED in accordance with a first cumulative lighting period of the first LED and with both luminance transitions and a second cumulative lighting period of the second LED.

Abstract: An LED display apparatus includes an LED aging unit, a correction factor computing unit, and a luminance correction circuit. The LED aging unit includes an LED aging display that includes at least one second LED, a luminance measurer that measures luminance decrease rates of the second LED per color correspondently to lighting periods of first LEDs, and a luminance decrease rate storage that stores the luminance decrease rates. The correction factor computing unit computes correction factors for correcting luminances of the first LEDs per color in accordance with cumulative lighting periods of the first LEDs of corresponding colors and the luminance decrease rates of corresponding colors. The luminance correction circuit corrects the luminance of the first LEDs per color in accordance with the correction factors.

Abstract: In the case where luminance of light to be irradiated onto a multi-screen is not homogenized over the entire multi-screen, each of an image display apparatus and image display apparatuses carries out a homogenizing process of light to be irradiated onto a multi-screen over the entire multi-screen.

Abstract: In a multi-screen display apparatus according to the present invention, a master image display apparatus acquires determination results obtained by an input detector and acquires a video signal of which channel is selected by a selector from each of a plurality of image display apparatuses including the master image display apparatus. In a case where the selector of any of the image display apparatuses selects a video signal of a channel that is not input to the video receiver, the master image display apparatus controls the selector of the image display apparatus to select a video signal of another channel that is input to the video receiver and controls the selector of at least one of the others of the image display apparatuses to select a video signal of the other channel.

Abstract: A controller determines whether parallel-connected light sources include a faulty light source. When a faulty light source is included, the controller controls at least one of a current supply unit and a switching unit such that a current is continuously supplied to normal light sources being light sources of the light sources except for the faulty light source.

Abstract: A controller determines whether parallel-connected light sources include a faulty light source. When a faulty light source is included, the controller controls at least one of a current supply unit and a switching unit such that a current is continuously supplied to normal light sources being light sources of the light sources except for the faulty light source.