公开(公告)号：US11488529B2

公开(公告)日：2022-11-01

申请号：US16849712

申请日：2020-04-15

Applicant: Apple Inc.

Inventor： Injae Hwang ,  Jesun Kim ,  Hyunwoo Nho ,  Jie Won Ryu ,  Hyunsoo Kim ,  Junhua Tan ,  Myungjoon Choi ,  Rebecca Park ,  Shiping Shen ,  Sun-Il Chang ,  Shengkui Gao ,  Kingsuk Brahma ,  Jesse Aaron Richmond ,  Changki Min ,  Yifan Zhang ,  Jiye Lee ,  Chaohao Wang

IPC: G09G3/3233 ,  G09G3/00

Abstract: A current-voltage (IV) relationship of a pixel having a diode is initially determined. A first voltage is determined that does not cause the diode to emit light, and a first current across the diode is sensed by applying the first voltage. A predetermined current is determined based on the first voltage and the IV relationship. A ratio is determined based on the first current, a target current, and the predetermined current. A ratio voltage is determined by applying the ratio to a predetermined target voltage. If the first current is less than the predetermined current, then the ratio voltage is applied to supply a target current to the diode. If the first current is greater than the predetermined current, then a second voltage is determined by averaging the first test voltage and the ratio voltage, and the second voltage is applied to supply the target current to the diode.

公开(公告)号：US11282458B2

公开(公告)日：2022-03-22

申请号：US16897206

申请日：2020-06-09

Applicant: Apple Inc.

Inventor： Hyunsoo Kim ,  Injae Hwang ,  Jesun Kim ,  Jesse A. Richmond ,  Junhua Tan ,  Jie Won Ryu ,  Hyunwoo Nho ,  Kingsuk Brahma ,  Chaohao Wang ,  Shiping Shen ,  Myungjoon Choi ,  Myung-Je Cho ,  Rebecca Park ,  Sun-Il Chang

IPC: G09G3/32 ,  G09G3/3258 ,  G09G3/36 ,  G06F3/044

Abstract: Systems and methods are presently disclosed that compensate for temperature-based parasitic capacitance variation of a pixel of a display by causing a driver transistor of the pixel to enter an ohmic or linear region. A lookup table is generated based on temperatures at the pixel, diode voltages, and target diode currents or luminances at a diode of the pixel. A correction voltage is determined based on a target diode current or luminance, a temperature at the pixel, and the lookup table. A data voltage is applied corresponding to the target diode current or luminance and the correction voltage to the driver transistor.