Electro-luminescence display device and driving method thereof
AssigneeLG Display Co., Ltd.
InventorsHan Sang Lee, Hae Yeol Kim
Life of this patent
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Abstract
An electro-luminescence display device includes an electro-luminescence panel having a plurality of pixels at pixel areas defined by intersections between data lines and gate lines, each of the pixels including: an electro-luminescence cell connected to receive a supply voltage, a driving thin film transistor controlling a current amount flowing through the electro-luminescence cell, and a bias switch connected to a gate terminal of the driving thin film transistor, the bias switch selectively applying an inverse voltage to the driving thin film transistor.
Claims10
An electro-luminescence display device comprising:
- an electro-luminescence panel having a plurality of pixels at pixel areas defined by intersections between data lines and gate lines, each of the pixels including:
- an electro-luminescence cell connected to receive a supply voltage;
- a driving thin film transistor controlling a current amount flowing through the electro-luminescence cell;
- and
- a bias switch connected to a gate terminal of the driving thin film transistor, the bias switch selectively applying an inverse voltage to the gate terminal of the driving thin film transistor,
- wherein the bias switch comprises,
- a drain terminal connected to the gate terminal of the driving thin film transistor of the pixel connected to an nth gate line (GLn, n being an integer);
- a source terminal connected to an inverse voltage source, the inverse voltage source supplying the inverse voltage;
- and
- a gate terminal connected to an (n-1)th gate line (GLn-1).
A method of driving an electro-luminescence display device having a driving thin film transistor provided for each of pixels arranged in a matrix-like manner, comprising:
- sequentially applying a scanning pulse to gate lines;
- applying a data signal to a gate terminal of the driving thin film transistor for the pixel connected to an nth gate line(GLn, n being an integer) when said scanning pulse is applied to the nth gate line (GLn);
- controlling a current flowing from a supply voltage source, via an electro-luminescence cell for the pixel connected to the nth gate line (GLn), to a reference voltage source based on said data signal;
- and
- selectively supplying an inverse voltage to the gate terminal of the driving thin film transistor for the pixel connected to the nth gate line (GLn), using a bias switch connected to a gate terminal of the driving thin film transistor,
- wherein the bias switch comprises,
- a drain terminal connected to the gate terminal of the driving thin film transistor of the pixel connected to the nth gate line(GLn);
- a source terminal connected to an inverse voltage source, the inverse voltage source supplying the inverse voltage;
- and
- a gate terminal connected to an (n-1)th gate line (GLn-1).
Dependencies are inferred from the claim text.