Active matrix electroluminescent display device
First Claim
1. An active matrix electroluminescent display device comprising an array of display pixels each comprising an electroluminescent display element and a driving device for controlling the current through the display element in a drive period based on a drive signal applied to the pixel during a preceding address period and stored as a voltage on a storage capacitance connected to the driving device, characterised in that each pixel includes feedback adjustment means responsive to the potential difference across the display element in the drive period and arranged to adjust the voltage stored on the storage capacitance in the address period in accordance therewith.
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Accused Products
Abstract
In an active matrix electroluminescent display device the drive current through an EL display element (20) in each pixel (10) in a drive period is controlled by a driving device (22) based on a drive signal applied to the pixel in 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 of an element for a given drive signal level diminishes over time, the pixel includes a feedback circuit (40, 45, 47, 48) which is responsive to the potential difference across the display element in an initial part of the drive period indicative of the extent of ageing and which is arranged to adjust the voltage stored on the storage capacitance accordingly.
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Citations
5 Claims
- 1. An active matrix electroluminescent display device comprising an array of display pixels each comprising an electroluminescent display element and a driving device for controlling the current through the display element in a drive period based on a drive signal applied to the pixel during a preceding address period and stored as a voltage on a storage capacitance connected to the driving device, characterised in that each pixel includes feedback adjustment means responsive to the potential difference across the display element in the drive period and arranged to adjust the voltage stored on the storage capacitance in the address period in accordance therewith.
Specification