公开(公告)号：US20240402237A1

公开(公告)日：2024-12-05

申请号：US18656567

申请日：2024-05-06

Applicant: Apple Inc.

Inventor： Xuebei Yang ,  Chung-Lun E Hsu ,  Cheuk Chi Lo ,  Hasan Akyol ,  Yingkan Lin ,  John T Wetherell ,  Han Zhao

IPC: G01R31/26 ,  H01L21/66

Abstract: Systems and methods are provided for electrical testing to supplement or replace optical testing of an electronic display. Internal testing circuitry that includes analog front end (AFE) and analog-to-digital converter (ADC) circuitry may be included in the electronic display and may be used either alone or in combination with other testing devices to perform electrical characterization and defect screening. The electrical characterization and defect screening may be performed before or after self-emissive elements such as light-emitting diodes are installed, further improving yield. Types of electrical characterization and defect screening may include a partial passive mode electrical characterization of OLEDs, vertical or horizontal crosstalk measurement, scan line integrity testing, pixel bright dot testing, display pixel defect detection, and delayed defect detection for defects that may occur after some extended period of time (e.g., after several minutes, after several hours).

公开(公告)号：US12300139B1

公开(公告)日：2025-05-13

申请号：US18328196

申请日：2023-06-02

Applicant: Apple Inc.

Inventor： Omar Hafiz ,  Baris Cagdaser ,  John T. Wetherell ,  Han Zhao

IPC: G09G3/20

Abstract: In an embodiment, an electronic display includes an active area including a plurality of pixels arranged in columns and a plurality of source drivers driving image data to columns of pixels. The electronic display also includes a first plurality of switches selectively coupling respective source drivers of the plurality of source drivers to one or more columns. Selective coupling enables the respective source drivers to, at different times, drive the image data to: a single column; and multiple columns. In another embodiment, an electronic display includes a display panel configured to operate using a reference voltage received via a resistive path having a routing resistance, a reference voltage source outputting the reference voltage, and a feedback circuit sensing an electrical parameter of the resistive path and producing a compensation voltage that, when added to the reference voltage, causes the reference voltage to remain substantially constant at the display panel.

公开(公告)号：US11705037B1

公开(公告)日：2023-07-18

申请号：US17408133

申请日：2021-08-20

Applicant: Apple Inc.

Inventor： Omar Hafiz ,  Baris Cagdaser ,  John T. Wetherell ,  Han Zhao

IPC: G09G3/20

CPC classification number: G09G3/20 ,  G09G2320/0233 ,  G09G2320/0626 ,  G09G2330/021

Abstract: In an embodiment, an electronic display includes an active area including a plurality of pixels arranged in columns and a plurality of source drivers driving image data to columns of pixels. The electronic display also includes a first plurality of switches selectively coupling respective source drivers of the plurality of source drivers to one or more columns. Selective coupling enables the respective source drivers to, at different times, drive the image data to: a single column; and multiple columns. In another embodiment, an electronic display includes a display panel configured to operate using a reference voltage received via a resistive path having a routing resistance, a reference voltage source outputting the reference voltage, and a feedback circuit sensing an electrical parameter of the resistive path and producing a compensation voltage that, when added to the reference voltage, causes the reference voltage to remain substantially constant at the display panel.