公开(公告)号：US10319296B2

公开(公告)日：2019-06-11

申请号：US15507394

申请日：2015-08-27

Applicant: JOLED INC.

Inventor： Kazuki Sawa ,  Hiroshi Hayashi ,  Tomoyuki Maeda

IPC: G09G3/3233 ,  G09G3/20 ,  G09G5/36

Abstract: A display device correction method performed by a control unit that performs display control on an organic electroluminescent (EL) panel including a plurality of display pixels, in an organic EL display which includes the organic EL panel and the control unit. The display device correction method includes: obtaining a cumulative value of a pixel signal supplied to a drive transistor which is included in a current pixel to be processed among the plurality of display pixels and supplies drive current according to the pixel signal to an organic EL element (OEL); calculating a shift amount of a threshold voltage of the drive transistor, using the cumulative value; calculating an amount of change in mobility, using the shift amount; and calculating a correction parameter for correcting a pixel signal, using the amount of change in mobility.

公开(公告)号：US11568812B2

公开(公告)日：2023-01-31

申请号：US17406433

申请日：2021-08-19

Applicant: JOLED INC.

Inventor： Eiji Iwauchi ,  Kazuki Sawa ,  Kazuhiro Yoneda

IPC: G09G3/3233

Abstract: A display device includes: a luminance converter which converts input gradation value into a corresponding target luminance value; a luminance correction calculator which calculates output gradation value from the target luminance value and calculates a corrected luminance value from the output gradation value, using an efficiency residual ratio which is an index representing the light-emitting element deterioration degree; a current stress calculator which converts current stress amount on the light-emitting element calculated from the corrected luminance value into current stress amount when reference current flows through the light-emitting element, and calculates the accumulated current stress amount; a temperature stress calculator which converts temperature stress amount on the light-emitting element under environmental temperature into temperature stress amount on the light-emitting element under reference temperature, and calculates the accumulated current stress amount; and an efficiency residual ratio calculator which updates the efficiency residual ratio, using the accumulated current and temperature stress amounts.

公开(公告)号：US11450278B2

公开(公告)日：2022-09-20

申请号：US17466154

申请日：2021-09-03

Applicant: JOLED INC.

Inventor： Eiji Iwauchi ,  Kazuki Sawa ,  Kazuhiro Yoneda

IPC: G09G3/3233

Abstract: A display device includes: a luminance converter which converts input gradation value into a corresponding target luminance value; a luminance correction calculator which calculates output gradation value from the target luminance value using efficiency residual ratio representing a deterioration degree of a light-emitting element, and calculates a corrected luminance value therefrom; a current stress calculator which converts current stress amount on a light-emitting element calculated from the corrected luminance value into current stress amount when first reference current flows through the light-emitting element, and accumulates this to calculate an accumulated first stress amount; a CB stress calculator which converts CB stress amount on the light-emitting element into current stress amount when second reference current flows through the light-emitting element, and accumulates this to calculate an accumulated second stress amount; and an efficiency residual ratio calculator which updates the efficiency residual ratio, using the accumulated first and second stress amounts calculated.