Matrix display device with photosensitive element

Details Matrix display device with photosensitive element Matrix display device with photosensitive element

2003-08-08

2008-11-18

Shalwala, Bipin (Department: 2629)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C345S082000, C345S084000

Reexamination Certificate

active

07453424

ABSTRACT:
A matrix display device comprises an array of addressable pixels (10) each having a display element (20) and a control circuit for controlling the operation of the display element. The control circuit includes a charge storage capacitor (36) and a photosensitive device (40) coupled to the storage capacitor for regulating charge stored on the storage capacitor (36) in accordance with light falling on the photosensitive device (40). The control circuit further comprises means for independent voltage control (42) of a gate terminal of the photosensitive device (40), preferably a phototransistor. In this way a more efficient and flexible biasing of the phototransistor is possible. The means preferably comprise a second row line (42) being connected to the gate terminal of the photosensitive device (40). This additional line allows also the use of transistors of the same polarity for this type of pixel circuit, saving additional process masks (and costs). In addition, it becomes possible to use the phototransistor as a TFT switch. This dual function (phototransistor/TFT switch) enables the pixel circuit to provide additional features; for example duty-cycle techniques for motion blur compensation.

REFERENCES:
patent: 6373455 (2002-04-01), Kuribayashi et al.
patent: 6489631 (2002-12-01), Young et al.
patent: 2001/0052597 (2001-12-01), Young et al.
patent: 2002/0047817 (2002-04-01), Tam
patent: 2002/0190934 (2002-12-01), Yoshida et al.
patent: WO0120591 (2001-03-01), None
patent: WO 01/99190 (2001-12-01), None

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