| 摘要 |
This invention relates to a display device ( 5 ) comprising first and a second sub-pixel ( 5 a , 5 b), said first sub-pixel ( 5 a) emitting light of a first wavelength (lambda 1 ) and said second sub-pixel ( 5 b) emitting light of a second wavelength (lambda 2 ), said first sub-pixel ( 5 a) comprising a first organic electroluminescent layer ( 1 a), such as a polymer or a small-compound molecule layer, which is sandwiched between a front and a back electrode ( 2 a, 3 a), with a first state in which an emission driving signal (V<SUB>al</SUB>) is applied across said first layer ( 1 a) for generating an emission state in which light of said first wavelength (lambda 1 ) is emitted, and with a second state in which a sensing driving signal (V<SUB>as</SUB>) is applied across said first layer ( 1 a), whereby light of said second wavelength (lambda 2 ) incident on said first sub-pixel ( 5 a) can be detected. Preferably, said first electrodes ( 2 a, 3 a) are held at essentially the same potential.
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