Matrix display device

Details Matrix display device Matrix display device

2005-06-28

2005-06-28

Shalwala, Bipin (Department: 2673)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C345S087000, C345S101000, C345S209000

Reexamination Certificate

active

06911966

ABSTRACT:
A matrix display device (60) comprises an array of pixels for producing a display output in response to drive signal voltages using an inversion drive scheme. Display artefacts, especially flicker, are corrected for by connecting together, in parallel, two pixels (31), previously addressed with respective drive signal voltages of opposite polarity, and measuring a residual voltage caused by a difference in charge stored on the two pixels due to a DC offset present in the pixels. The measured voltage is used to modify subsequent drive signal voltages for the pixels in order to reduce the measured voltage, i.e. towards zero, thus reducing display artefacts caused by the DC offset in the pixels. The invention is particularly applicable to transmissive type liquid crystal display devices.

REFERENCES:
patent: 5130829 (1992-07-01), Shannon
patent: 5408335 (1995-04-01), Takahashi et al.
patent: 6392626 (2002-05-01), Moon
patent: 6424330 (2002-07-01), Johnson
patent: 2002/0053999 (2002-05-01), Chou
patent: 2003/0030744 (2003-02-01), Baer
patent: 2003/0043138 (2003-03-01), Hector et al.
patent: 2003/0098835 (2003-05-01), O'Donnell et al.

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