公开(公告)号：US11436988B2

公开(公告)日：2022-09-06

申请号：US17091654

申请日：2020-11-06

Applicant: JOLED INC.

Inventor： Hiroaki Ishii

IPC: G09G5/10 ,  G09G3/34 ,  G09G3/20

Abstract: A control method or the like is provided capable of suppressing a flicker phenomenon even if frame periods vary in length. The control method is for controlling an emission period and an extinction period of a frame period, which is a period in which one image continues to be displayed. When a signal indicating start of a frame period is detected, as the frame period, n subframe periods that configure the frame period, where n is an integer greater than or equal to 2, are sequentially started from the first subframe period, after a predetermined period of time has elapsed since the detection of the signal. All of the n subframe periods are controlled to have a substantially same length determined in advance and to have a substantially same ratio between the emission period and the extinction period, determined in advance, the ratio being referred to as a duty ratio.

公开(公告)号：US11405595B2

公开(公告)日：2022-08-02

申请号：US16748360

申请日：2020-01-21

Applicant: JOLED INC.

Inventor： Hiroaki Ishii

IPC: H04N7/56 ,  H04N5/04 ,  H01L27/32 ,  G09G3/3258 ,  G09G3/3233

Abstract: A method for driving a display panel displays a video image signal that includes a plurality of images having different frame periods. The method includes setting a frame period including one or more light emission periods, and one or more light extinction periods. The method also includes dividing at least one frame period into a plurality of light emission periods and a plurality of light extinction periods, and adjusting lengths of the plurality of light emission periods and lengths of the plurality of light extinction periods based on a ratio between a maximum frequency of the frame period and a currently set frequency of the frame period. The method further includes displaying the video image signal by causing light emitting elements of the display panel to emit light during the adjusted light emission periods, and to extinguish light during the adjusted light extinction periods.

公开(公告)号：US10574946B2

公开(公告)日：2020-02-25

申请号：US15991848

申请日：2018-05-29

Applicant: JOLED INC.

Inventor： Hiroaki Ishii

IPC: H04N7/56 ,  H04N5/04 ,  G09G3/3258 ,  G09G3/3233 ,  H01L27/32

Abstract: A control device includes a data storing unit, a synchronization control unit, and a duty control unit. The synchronization control unit starts a frame period when a vertical synchronization signal is received. The frame period includes a light emission period and a light extinction period. The duty control unit controls a length of the light extinction period, based on a ratio between a total number of vertical lines in a current frame and a pre-set minimum number of vertical lines in a video image displayed on a display panel during a frame period, such that a ratio of a length of the light emission period and a length of the light extinction period during the frame period when a video image is displayed with the total number of vertical lines in the current frame is constant.

公开(公告)号：US20190051234A1

公开(公告)日：2019-02-14

申请号：US16049010

申请日：2018-07-30

Applicant: JOLED Inc.

Inventor： Hiroaki Ishii ,  Teppei Isobe

IPC: G09G3/3208

Abstract: A luminance controlling unit includes a luminance controller that controls luminance of a pixel array. The pixel array includes pixels each including a current-driven self-luminescent element. The luminescent controller sets, on the basis of an image signal corresponding to a frame image, a threshold that is directed to detection of a maximum signal level of the image signal, and performs dynamic control of a potential difference between a first voltage and a second voltage on the basis of the maximum signal level detected with reference to the set threshold. The first voltage is outputted from a first voltage source adjacent to an anode of the self-luminescent element, and the second voltage is outputted from a second voltage source adjacent to a cathode of the self-luminescent element.