Display apparatus and display reading apparatus

Details Display apparatus and display reading apparatus Display apparatus and display reading apparatus

2008-04-15

2008-04-15

Osorio, Richard (Department: 2629)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C345S082000

Reexamination Certificate

active

10870004

ABSTRACT:
In a display apparatus having organic EL devices to display images in units of pixels, each pixel comprises a first transistor to drive the relevant device; a current supply circuit for supplying, in a first mode, a current of a magnitude based on the value of the pixel displayed by the device; a second transistor whose control electrode is connected to the control electrode of the first transistor to thereby constitute a current mirror circuit, wherein the second transistor receives, in the first mode, the current from the current supply circuit; a capacitor connected to the control electrode of the second transistor and holding, in the first mode, the voltage generated in the control electrode of the second transistor when the current from the current supply circuit has been received; and a switch for connecting, in a second mode, the device to the first transistor in a state where the voltage generated in the control electrode of the second transistor and held in the capacitor is supplied to the control electrode of the first transistor. In this device, high-quality image display can be achieved at lower cost with a simplified structure.

REFERENCES:
patent: 2003/0230750 (2003-12-01), Koyama et al.
patent: 2005/0057580 (2005-03-01), Yamano et al.
patent: 2005/0151705 (2005-07-01), Fish
patent: 2005/0168491 (2005-08-01), Takahara et al.
patent: 2005/0180083 (2005-08-01), Takahara et al.
patent: 2002-189445 (2002-07-01), None

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