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US 7,119,763 B2Granted
Light emitting circuit for organic electroluminescence element and display device
AssigneePioneer Corporation
InventorYoshiyuki Okuda
Life of this patent
Estimating the term…
Abstract
A light emitting circuit and a display device capable of providing refresh action to an organic electroluminescence element to which a diode is connected in series, in a comparatively easy structure, in order to improve the average luminance.
Claims14
A light emitting circuit for making an organic electroluminescence element emit light in response to a light emission instruction, comprising:
- a first diode element connected with the organic electroluminescence element in a same polarity direction in series,
- a second diode element connected with said organic electroluminescence element at a connection point between said organic electroluminescence element and said first diode element, in a direction contrary to the polarity direction of the first diode element,
- driving current supplying means for supplying a driving current for light emission in the forward polarity direction to the serial circuit of said organic electroluminescence element and said first diode element in response to the light emission instruction, and
- reverse bias application means for applying a voltage to the serial circuit of said organic electroluminescence element and said second diode element in the direction contrary to the forward polarity direction of said organic electroluminescence element when said organic electroluminescence element does not emit light.
1 more element
A display device comprising:
- a display panel in which a plurality of light emitting cells respectively including organic electroluminescence elements are arranged in a matrix shape;
- light emitting cell specifying means for specifying a least one light emitting cell to be driven to emit light of said light emitting cells in accordance with input image data;
- and
- driving means for making an organic electroluminescence element emit light, said organic electroluminescence element being in the light emitting cell specified by said light emitting cell specifying means,
- wherein said light emitting cell includes a first diode element connected with said organic electroluminescence element in a same polarity direction in series, and
- a second diode element connected with said organic electroluminescence element at a connection point between said organic electroluminescence element and said first diode element, in a direction contrary to the polarity direction of the first diode element, and
- said driving means includes driving current supplying means for supplying a driving current for light emission in the forward polarity direction to the serial circuit of said organic electroluminescence element and said first diode element in response to the light emission instruction, and
- reverse bias application means for applying a voltage to the serial circuit of said organic electroluminescence element and said second diode element in the direction contrary to the forward polarity direction of said organic electroluminescence element when said organic electroluminescence element does not emit light.
5 more elements
A light emitting circuit for making an organic electroluminescence element emit light in response to a light emission instruction, comprising:
- a diode element connected with said organic electroluminescence element in a forward polarity direction in series;
- a capacitive element connected at the connection point of said organic electroluminescence element and said diode element;
- driving current supplying means for supplying a driving current in the forward direction to said organic electroluminescence element and said capacitive element through said diode element in response to the light emission instruction;
- and
- reverse bias application means for applying a voltage to the serial circuit of said organic electroluminescence element and said capacitive element in the direction contrary to the forward polarity direction of said organic electroluminescence element when said organic electroluminescence element does not emit light.
2 more elements
A light emitting circuit for making an organic electroluminescence element emit light in response to a light emission instruction, comprising:
- a diode element connected with said organic electroluminescence element in a forward polarity direction in series;
- a capacitive element connected with said organic electroluminescence element at the connection point of said organic electroluminescence element and said diode element;
- first potential application means for applying a first potential, which is higher than a reference potential, to one end of said organic electroluminescence element on a side opposite to the connection point;
- driving current supplying means for supplying a driving current in the forward direction to said capacitive element through said diode element in response to the light emission instruction;
- and
- second potential application means for applying the first potential to one end of said capacitive element on a side opposite to said connection point, after finishing the supply of the driving current by said driving current supplying means.
3 more elements
A display device comprising:
- a display panel in which a plurality of light emitting cells respectively including organic electroluminescence elements are arranged in a matrix shape;
- light emitting cell specifying means for specifying a least one light emitting cell to be driven to emit light of said light emitting cells in accordance with input image data;
- and
- driving means for making an organic electroluminescence element emit light, said organic electroluminescence element being in the light emitting cell specified by said light emitting cell specifying means,
- wherein said light emitting cell includes a diode element connected with said organic electroluminescence element in a forward polarity direction in series, and
- a capacitive element connected at the connection point of said organic electroluminescence element and said diode element, and
- said driving means includes driving current supplying means for supplying a driving current in the forward direction to said organic electroluminescence element and said capacitive element through said diode element in response to the light emission instruction, and
- reverse bias application means for applying a voltage to the serial circuit of said organic electroluminescence element and said capacitive element in the direction contrary to the forward polarity direction of said organic electroluminescence element when said organic electroluminescence element does not emit light.
5 more elements
A display device comprising:
- a display panel in which a plurality of light emitting cells respectively including organic electroluminescence elements are arranged in a matrix shape;
- light emitting cell specifying means for specifying a least one light emitting cell to be driven to emit light of said light emitting cells in accordance with input image data;
- and
- driving means for making an organic electroluminescence element emit light, said organic electroluminescence element being in the light emitting cell specified by said light emitting cell specifying means,
- said light emitting cell includes a diode element connected with said organic electroluminescence element in a forward polarity direction in series, and
- a capacitive element connected with said organic electroluminescence element at the connection point of said organic electroluminescence element and said diode element, and
- said driving means includes first potential application means for applying a first potential, which is higher than a reference potential, to one end of said organic electroluminescence element on a side opposite to the connection point,
- driving current supplying means for supplying a driving current in the forward direction to said capacitive element through said diode element in response to the light emission instruction, and
- second potential application means for applying the first potential to one end of said capacitive element on a side opposite to said connection point, after finishing the supply of the driving current by said driving current supplying means.
6 more elements
Dependencies are inferred from the claim text.