06542138 is referenced by 222 patents and cites 5 patents.

An active matrix electroluminescent display device in which the drive current through an electroluminescent display element (

20

) in each pixel (

10

) in a drive period is controlled by a driving device (

22

) based on a drive signal applied during a preceding address period and stored as a voltage on an associated storage capacitor (

36

). In order to counteract the effects of display element ageing, through which the light output for a given drive signal level diminishes over time, the pixel includes electro-optic discharging means (

40

) coupled to the storage capacitor and responsive to the display element's light output to leak stored charge and to control the integrated light output of the display element in the drive period. For improved control, the discharging means is arranged to rapidly discharge the capacitor at a controlled point in the drive period, upon the drive of the display element falling to a low level. A photoresponsive transistor can conveniently be utilised for this purpose.

Title
Active matrix electroluminescent display device
Application Number
9/658925
Publication Number
6542138 (B1)
Application Date
September 11, 2000
Publication Date
April 1, 2003
Inventor
Alan G Knapp
Crawley
US
John M Shannon
Whyte Leafe
US
Assignee
Koninklijke Philips Electronics
US
IPC
G09G 3/30
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