Invention Grant
- Patent Title: Liquid crystal display using depletion-mode transistors
- Patent Title (中): 使用耗尽型晶体管的液晶显示器
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Application No.: US13937825Application Date: 2013-07-09
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Publication No.: US09214127B2Publication Date: 2015-12-15
- Inventor: Abbas Jamshidi-Roudbari , Cheng-Ho Yu , Hopil Bae , Shih Chang Chang , Ting-Kuo Chang
- Applicant: APPLE INC.
- Applicant Address: US CA Cupertino
- Assignee: APPLE INC.
- Current Assignee: APPLE INC.
- Current Assignee Address: US CA Cupertino
- Agency: Fletcher Yoder PC
- Main IPC: G09G5/00
- IPC: G09G5/00 ; G09G3/36

Abstract:
Methods and devices employing charge removal circuitry are provided to reduce or eliminate artifacts due to a bias voltage remaining on an electronic display after the display is turned off. In one example, a method may include connecting a pixel electrode of a display to ground through charge removal circuitry while the display is off (e.g., using depletion-mode transistors that are active when gates of the depletion-mode transistors are provided a ground voltage). When a corresponding common electrode is also connected to ground, a voltage difference between the pixel electrode and common electrode may be reduced or eliminated, preventing a bias voltage from causing display artifacts in the pixel.
Public/Granted literature
- US20150015559A1 LIQUID CRYSTAL DISPLAY USING DEPLETION-MODE TRANSISTORS Public/Granted day:2015-01-15
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