公开(公告)号：US20220293060A1

公开(公告)日：2022-09-15

申请号：US17674403

申请日：2022-02-17

Applicant: SHARP KABUSHIKI KAISHA

Inventor： HIDEKAZU MIYATA

IPC: G09G3/36 ,  G02F1/13357

Abstract: A control unit receives an input image signal including input display gray scale data corresponding to the virtual opposing regions, selects a set of pieces of subpixel gray scale data corresponding to the virtual opposing regions from the input display gray scale data, extracts a maximum amount of subpixel gray scale data among the set of pieces of subpixel gray scale data as extracted gray scale data corresponding to one first pixel facing the virtual opposing regions among the plurality of first pixels, and controls a transmittance of light of the one first pixel using designated pixel gray scale data in a case where the extracted gray scale data has a level equal to or higher than an output determination reference gray scale level, the designated pixel gray scale data being gray scale data having a maximum transmittance of a first liquid crystal panel.

公开(公告)号：US20200312272A1

公开(公告)日：2020-10-01

申请号：US16496226

申请日：2018-03-22

Applicant: SHARP KABUSHIKI KAISHA

Inventor： HIDEKAZU MIYATA

IPC: G09G5/10

Abstract: A luminance difference in an image displayed on an area of interest is easily recognized in a manner free from the effect of luminance of an area surrounding the area of interest. An HDR display (100) includes an image processing unit (14). If the number of digits of a difference between a luminance center value of a luminance distribution in the area of interest in a display unit (20) and a luminance center value of a luminance distribution in an entire display region is 2 digits or more, the image processing. unit (14) performs a luminance conversion on the luminance value of each pixel in an entire screen in a manner such that the luminance center value of the luminance distribution in the entire display region approaches the luminance center value of the luminance distribution in the area of interest.

公开(公告)号：US20200257167A1

公开(公告)日：2020-08-13

申请号：US16752414

申请日：2020-01-24

Applicant: SHARP KABUSHIKI KAISHA

Inventor： HIDEKAZU MIYATA ,  NAOTO INOUE

IPC: G02F1/13357 ,  G09G3/34

Abstract: A backlight is configured by a power supply switching circuit configured to switch a supply destination of a power source voltage for LED driving among a plurality of blocks, a plurality of power source lines which are provided in one-to-one correspondence with the plurality of blocks and are each connected to an upstream end of each of LED units included in a corresponding block, an LED drive circuit including the same number of turn-on control switches, which are for controlling whether to supply a current to LEDs, as LED snits included in each block, and one or more discharge control circuits provided for each block. The discharge control circuit lowers a voltage level at the upstream end of each of LED snits included in a corresponding block after an end of a period in which the power source voltage is supplied to the corresponding block.

公开(公告)号：US20200285112A1

公开(公告)日：2020-09-10

申请号：US16796188

申请日：2020-02-20

Applicant: SHARP KABUSHIKI KAISHA

Inventor： HIDEKAZU MIYATA

IPC: G02F1/13357

Abstract: A lighting device includes a light source emitting primary light rays that are included in a certain wavelength region, a wavelength conversion member, and a reflection layer. The wavelength conversion member has a function of converting some of the primary light rays that have passed through the wavelength conversion member into secondary light rays that are included in another wavelength region that is different from the certain wavelength region. The reflection layer has a function of reflecting light rays that reach a first surface on an opposite side from the light source. The reflection layer includes a light transmission section in a portion thereof, and light rays that reach a second surface on a light source side pass through the light transmission section to the first surface at a higher ratio than other section of the reflection layer.

公开(公告)号：US20200005710A1

公开(公告)日：2020-01-02

申请号：US16449217

申请日：2019-06-21

Applicant: SHARP KABUSHIKI KAISHA

Inventor： HIDEKAZU MIYATA ,  NORIAKI YAMAGUCHI

IPC: G09G3/3233 ,  G09G3/3258 ,  G09G3/20

Abstract: A plurality of LED drive circuits are provided so as to correspond one-to-one with plurality of LED units arranged in matrix. In the LED drive circuit, a data voltage is written to a memory capacitor in a charge period that appears every one frame period, in the LED drive circuit, the reset control transistor is turned on and off more than once after a time point at which the charge period ends until a time point at which the next charge period starts, so that a lighting enable period in which a lighting period control operation is performed is provided more than once every one frame period.

公开(公告)号：US20190340995A1

公开(公告)日：2019-11-07

申请号：US16310785

申请日：2017-08-02

Applicant: SHARP KABUSHIKI KAISHA

Inventor： HIDEKAZU MIYATA ,  NORIAKI YAMAGUCHI

IPC: G09G3/36 ,  G02F1/1343

Abstract: Periods P1 to P3 are set when a power of a liquid crystal display device 10 is turned off. In an afterimage deletion period P1, a gate line is driven similarly to a case of a normal operation, and a correction voltage obtained by adding a pull-in voltage to a voltage of a common electrode is applied to a source line. In a voltage drop period P2, a zero voltage is applied to the gate line, the source line, and the common electrode. In a charge discharging period P3, the zero voltage is applied to the source line and the common electrode, and in at least a part of the charge discharging period P3, a voltage that enables charge to move between the source line and the pixel electrode via a TFT is applied to the gate line. A voltage holding unit that, even after an input power voltage is reduced, supplies a voltage, which is almost equal to the input power voltage, until at least the period P3 ends is provided. As a result, flicker or image sticking caused when the power is turned on again is prevented.

公开(公告)号：US20180053474A1

公开(公告)日：2018-02-22

申请号：US15555169

申请日：2016-02-24

Applicant: SHARP KABUSHIKI KAISHA

Inventor： HIDEKAZU MIYATA ,  MASAMITSU KOBAYASHI

IPC: G09G3/34 ,  G09G3/36

CPC classification number: G09G3/3413 ,  G09G3/3607 ,  G09G3/3648 ,  G09G3/3688 ,  G09G2300/0452 ,  G09G2310/0235 ,  G09G2310/08 ,  G09G2320/0242 ,  G09G2320/0252 ,  G09G2320/028 ,  G09G2320/062 ,  G09G2320/10 ,  G09G2340/00 ,  G09G2360/16

Abstract: A liquid crystal display device employing a field sequential system includes: a color correction unit (122) configured to perform a color correction processing that changes a saturation of input gradation data representing a color of a pixel without changing a hue thereof and configured to output pixel data obtained by the color correction processing as digital gradation data (D1 to D3) which are data corresponding to each field; and a digital gradation data correction unit configured to perform correction that enhances a temporal change of data values of digital gradation data (D1 to D3) outputted from the color correction unit (122). The color correction unit (122) performs the color correction processing on the input gradation data such that a color based on pixel data obtained by the color correction processing is a color that can be displayable in the liquid crystal panel by the field sequential system.

公开(公告)号：US20190281281A1

公开(公告)日：2019-09-12

申请号：US16293333

申请日：2019-03-05

Applicant: SHARP KABUSHIKI KAISHA

Inventor： HIDEKAZU MIYATA

IPC: H04N13/398 ,  H04N13/344 ,  H04N5/57 ,  H04N13/133

Abstract: An illumination unit, a transmission unit, and a control unit that controls emission luminances of the plurality of light sources based on an input video are provided. The video includes a first video and a second video associated with the first video. Each of the first video and the second video includes a common portion at which a common object is displayed in a form of a stereoscopic video. The control unit determines a correspondence pixel as a pixel of the second video, which represents a common portion with a target pixel as a pixel of the first video, and determines the emission luminance of the light source for each local region such that a luminance difference between a first incoming luminance of light reaching the target pixel and a second incoming luminance of light reaching the correspondence pixel is small.

公开(公告)号：US20190281278A1

公开(公告)日：2019-09-12

申请号：US16289955

申请日：2019-03-01

Applicant: SHARP KABUSHIKI KAISHA

Inventor： HIDEKAZU MIYATA

IPC: H04N13/344 ,  G02F1/13357 ,  H04N13/167

Abstract: A stereoscopic image display apparatus includes an illumination unit in which a plurality of light sources are disposed, a transmission unit that transmits light arriving from the illumination unit for each pixel based on an input image, and changes transmittance of the light for each pixel; a barrier unit that allows the light transmitted through the transmission unit to be viewed as a right-eye image and a left-eye image; and a control unit that divides an area of the illumination unit based on the input image and controls emission luminance of the light source for each area.

公开(公告)号：US20190035350A1

公开(公告)日：2019-01-31

申请号：US16077011

申请日：2017-02-10

Applicant: SHARP KABUSHIKI KAISHA

Inventor： HIDEKAZU MIYATA

IPC: G09G3/36 ,  G02F1/1362

Abstract: A scanning line drive circuit 13 makes selection periods P11 to P1m, P21 to P2m having a same length correspond to scanning lines G11 to G1m, G21 to G2m. The scanning line drive circuit 13 takes a time point at which a same length of time elapses from a start in each selection period as an arrival time point, applies a gate-on voltage VGH to the scanning line from a time point reached by going back from the arrival time point in a corresponding selection period by a time that is longer as a load of the scanning line is larger, and applies a gate-off voltage VGL to the scanning line from an end of the corresponding selection period. With this, it is possible to make a write period to pixels equal in length among different scanning lines and prevent an error in brightness of the pixel for each scanning line, the error caused due to a variation in the load of the scanning line.