公开(公告)号：US10026365B2

公开(公告)日：2018-07-17

申请号：US15041569

申请日：2016-02-11

Applicant: Japan Display Inc.

Inventor： Kazuhiko Sako ,  Tsutomu Harada ,  Naoyuki Takasaki

IPC: G09G3/20 ,  G09G3/34

Abstract: A display device includes an image display panel, a backlight with independently driven light sources for lighting the image display panel, a backlight control section which calculates, on the basis of required luminance for each divided area based on an image signal and luminance distribution information for the backlight, tentative lighting levels of the light sources, selects the light sources in calculation order, calculates estimated luminance of a selected light source on the basis of the calculated tentative lighting levels or the calculated lighting level of an already selected light source and the luminance distribution information, and calculates, if the estimated luminance does not satisfy the required luminance, a lighting level of the selected light source that satisfies the required luminance on the basis of the tentative lighting level thereof and the luminance distribution information, and a calculation order change section which changes the calculation order at determined timing.

公开(公告)号：US20180061310A1

公开(公告)日：2018-03-01

申请号：US15672699

申请日：2017-08-09

Applicant: Japan Display Inc.

Inventor： Kazuhiko Sako ,  Kazunari Tomizawa ,  Tsutomu Harada ,  Naoyuki Takasaki ,  Tae Kurokawa

IPC: G09G3/22 ,  G09G3/34 ,  G09G3/20

CPC classification number: G09G3/22 ,  G09G3/2003 ,  G09G3/3406 ,  G09G3/3413 ,  G09G3/342 ,  G09G3/3607 ,  G09G2300/0426 ,  G09G2300/0452 ,  G09G2320/02 ,  G09G2320/0673 ,  G09G2330/021 ,  G09G2340/06 ,  G09G2360/16 ,  G09G2370/08

Abstract: A signal processor of a display device includes: a light emission value calculating unit that calculates a light emission value; a chunk determining unit that determines whether pixels within a predetermined luminance value range are continuously present and determines an area of the continuous pixels as a chunk; a maximum luminance value detecting unit that detects a maximum luminance value inside the chunk in one of the partial areas; a luminance gain value determining unit that determines a luminance gain value based on the maximum luminance value such that a corrected light emission value that is a value acquired by multiplying the light emission value by the luminance gain value is a value of an upper limit emission value or less; and a light emission control unit that causes the light source units to emit light based on the corrected light emission value.

公开(公告)号：US20170323600A1

公开(公告)日：2017-11-09

申请号：US15583146

申请日：2017-05-01

Applicant: Japan Display Inc.

Inventor： Kazuhiko Sako ,  Naoyuki Takasaki ,  Tsutomu Harada ,  Tatsuya Yata ,  Shigenori Aoki

IPC: G09G3/34

CPC classification number: G09G3/342 ,  G09G3/3426 ,  G09G3/3648 ,  G09G2320/0271 ,  G09G2320/0686 ,  G09G2360/147

Abstract: According to an aspect, a display apparatus includes: a plurality of light sources; a display device that includes a display area provided with n1 pixels and that is irradiated with light from the light sources; a light source controller controlling an operation of the light sources; and a display controller controlling an output gradation value of part or all of the pixels. The display area includes a plurality of partial areas, the partial areas corresponding to the light sources on a one-to-one basis. The light source controller determines the amount of light emitted from each light source corresponding to a corresponding one of the partial areas based on luminance of light required for the corresponding partial area. The display controller performs first correction and second correction when the amounts of light emitted from two light sources corresponding to two adjacent partial areas are different.

公开(公告)号：US20170162128A1

公开(公告)日：2017-06-08

申请号：US15367091

申请日：2016-12-01

Applicant: Japan Display Inc.

Inventor： Susumu Kimura ,  Kazuhiko Sako ,  Tadafumi Ozaki ,  Naoyuki Takasaki ,  Fumitaka Gotoh ,  Tsutomu Harada

IPC: G09G3/34 ,  H05B33/08 ,  F21V8/00

CPC classification number: G09G3/342 ,  G02B6/0068 ,  G09G2320/0626 ,  G09G2320/0646 ,  G09G2330/12 ,  G09G2360/16 ,  H05B33/0827 ,  H05B33/083 ,  H05B33/089

Abstract: According to one embodiment, a light source device includes a plurality of light emitting elements including at least first and second light emitting elements, lightguide, first circuit, second circuit, and controller. The lightguide includes a first surface on which light from light emitting elements is incident and a second surface through which the light exits. The first circuit connects light emitting elements in series. The second circuit can bypass each of light emitting elements. The controller turns on light emitting elements using the first circuit if light emitting elements function normally, and if one of light emitting elements functions abnormally, the controller turns on the light emitting element functioning normally using the second circuit.