Active drive type light emitting display device and drive...

Computer graphics processing and selective visual display system – Display driving control circuitry

Reexamination Certificate

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Details

C345S076000

Reexamination Certificate

active

10770394

ABSTRACT:
In a light emitting display device which is actively driven by TFTs, light emitting display pixels are driven efficiently. In a light emitting display panel10, a large number of light emitting display pixels10aare arranged in a matrix pattern and measuring pixels10bare arranged forming a line along one dataline. A constant current is supplied from a constant current source11to the measuring pixels10b, and the forward voltage VF of the EL element in the measuring pixel10bis obtained by a voltage detecting terminal12.The value of the drive voltage supplied to the light emitting display pixels10ais controlled based on the forward voltage VF. Thus, a drive TFT (Tr2) constructing the light emitting display pixel10acan drive an EL element E1in the state where a drop voltage (VD) of the degree by which a constant current characteristic can be ensured is ensured, and a power loss generated in the drive TFT can be effectively restrained.

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