公开(公告)号：US20150348469A1

公开(公告)日：2015-12-03

申请号：US14654940

申请日：2013-12-19

Applicant: SHARP KABUSHIKI KAISHA

Inventor： Katsuya OTOI

IPC: G09G3/34 ,  G09G3/36

CPC classification number: G09G3/3406 ,  G09G3/3426 ,  G09G3/36 ,  G09G2320/0238 ,  G09G2320/0626 ,  G09G2320/0646 ,  G09G2360/145 ,  G09G2360/16

Abstract: It is possible to realize a liquid crystal display device 1 which is provided with a down-converter 7, a local dimming control circuit 8, and an upscaling control circuit 9 including a luminance ratio calculation circuit and a gradation conversion circuit, and thus, capable of processing an image having an image size that is not assumed, and further, reducing a storage area, a processing load and a circuit size.

Abstract translation: 可以实现具有下变频器7，局部调光控制电路8以及包括亮度比计算电路和灰度转换电路的放大控制电路9的液晶显示装置1，从而能够 处理具有不具有图像尺寸的图像，并且还减少存储区域，处理负载和电路尺寸。

公开(公告)号：US20180233081A1

公开(公告)日：2018-08-16

申请号：US15751552

申请日：2016-08-03

Applicant: Sharp Kabushiki Kaisha

Inventor： Noritaka KISHI ,  Hiroyuki FURUKAWA ,  Katsuya OTOI ,  Kazuyoshi YOSHIYAMA ,  Tamotsu SAKAI ,  Naoko GOTO ,  Noboru NOGUCHI

IPC: G09G3/3233

CPC classification number: G09G3/3233 ,  G09G2320/0233 ,  G09G2320/0285 ,  G09G2320/0295 ,  G09G2320/0693

Abstract: In a data line drive/current measurement circuit, m measurement units are disposed in a plurality of semiconductor chips such that the m measurement units are distributed among the plurality of semiconductor chips. A display apparatus includes transistors such that one transistor is provided for two adjacent semiconductor chips. Inter-chip correction data indicating a variation among the semiconductor chips in terms of characteristics of elements in the measurement units is determined based on a result of a current measurement performed for the same transistor using measurement units disposed in different semiconductor chips. The inter-chip correction data is stored in a storage unit and is used in correcting an image signal. The inter-chip correction data may be determined based on a result of measuring a current flowing through a common cathode of organic EL elements for each semiconductor chip. Thus, a variation in the characteristic of the element among the semiconductor chips is compensated for and high image quality is achieved in displaying.

公开(公告)号：US20180061328A1

公开(公告)日：2018-03-01

申请号：US15559883

申请日：2016-03-18

Applicant: Sharp Kabushiki Kaisha

Inventor： Noritaka KISHI ,  Hiroyuki FURUKAWA ,  Katsuya OTOI ,  Kazuyoshi YOSHIYAMA ,  Tamotsu SAKAI ,  Naoko GOTOH

IPC: G09G3/3291 ,  G09G3/3233 ,  G09G3/3266 ,  G01R19/165

CPC classification number: G09G3/3291 ,  G01R19/16576 ,  G09G3/3225 ,  G09G3/3233 ,  G09G3/3266 ,  G09G3/3275 ,  G09G2310/0289 ,  G09G2310/0291 ,  G09G2310/08 ,  G09G2320/0233

Abstract: In a current measurement period of a pixel circuit (20), a measurement voltage is applied to a non-inverting input terminal of an operational amplifier (31), switches (35, 36) turn on, and a switch (37) turns off. Next, the switch (36) turns off, and a capacitor (32) is charged with charge of a current flowing through the pixel circuit (20). Next, the switch (35) turns off, the switch (37) turns on, a constant current flows through a current source (33), and a voltage of a second terminal (terminal connected to an output terminal of the operational amplifier (31)) of the capacitor (32) decreases. A voltage comparator (42) and a counter (43) measure the current flowing through the pixel circuit (20) by measuring time until a voltage of the second terminal of the capacitor reaches a voltage Vcomp. A video signal VS1 is corrected based on a current measurement result. With this, it is possible to compensate for capacitance variation of a capacitance in a current measurement circuit and perform high image quality display.

公开(公告)号：US20190259343A1

公开(公告)日：2019-08-22

申请号：US16345741

申请日：2017-10-03

Applicant: Sharp Kabushiki Kaisha

Inventor： Masaaki MORIYA ,  Katsuya OTOI ,  Takayuki MURAI

IPC: G09G3/36 ,  G09G3/34

Abstract: An image display device allowing a user to view an image with a dynamic range wider than before can be realized regardless of performance limitations of a light emitting element or a power supply. The image display device includes a glare correction unit for correcting a pixel value of a pixel around a high luminance pixel so that a gradation area, in which a luminance value gradually decreases from the high luminance pixel to a low luminance pixel, is provided. The glare correction unit includes a high luminance pixel searching unit for detecting a high luminance pixel among pixels within a predetermined range centered on a target pixel and for outputting mixing ratio data and pixel data of the high luminance pixel, and a pixel value mixing unit for correcting pixel data of the target pixel by mixing pixel data of the target pixel and the pixel data of the high luminance pixel based on the mixing ratio data.