EL display apparatus, driving circuit of EL display apparatus, and image display apparatus
First Claim
Patent Images
1. An EL display apparatus comprising:
- a display screen including a plurality of gate signal lines and a plurality of source signal lines which are arranged to intersect with each other, and pixels in each of which an EL light emitting element is formed to correspond to an intersection point of each of the gate signal lines and each of the source signal lines;
a current driving device formed for each of the pixels for driving the EL light emitting element by a second current responsive to a source signal represented by a first current;
a signal current source for outputting the source signal in response to an image signal to the current driving device via the source signal line; and
a precharge voltage source for outputting a predetermined voltage to the source signal line, whereinthe current driving device is configured to drive the EL light emitting element by the second current responsive to a voltage of a control terminal connected to the source signal line; and
the predetermined voltage corresponds to gray scale data of the image signal.
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Abstract
The EL display apparatus according to this invention is provided with an EL light emitting element, a current driving device for driving the EL light emitting element by a current responsive to a source signal represented by a current, and a signal current source (634) for outputting the source signal in response to image signal to the current driving device via a source signal line, the EL display apparatus being further provided with a precharge voltage source (631) for outputting a predetermined voltage and a switching and connecting unit (636, 637) capable of selectively connecting either the signal current source or the precharge voltage source to the source signal line (638).
166 Citations
14 Claims
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1. An EL display apparatus comprising:
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a display screen including a plurality of gate signal lines and a plurality of source signal lines which are arranged to intersect with each other, and pixels in each of which an EL light emitting element is formed to correspond to an intersection point of each of the gate signal lines and each of the source signal lines; a current driving device formed for each of the pixels for driving the EL light emitting element by a second current responsive to a source signal represented by a first current; a signal current source for outputting the source signal in response to an image signal to the current driving device via the source signal line; and a precharge voltage source for outputting a predetermined voltage to the source signal line, wherein the current driving device is configured to drive the EL light emitting element by the second current responsive to a voltage of a control terminal connected to the source signal line; and the predetermined voltage corresponds to gray scale data of the image signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 14)
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11. A driving circuit of EL display apparatus, comprising:
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a plurality of unit current sources; a reference current generation circuit for defining a current to be output from the unit current sources; a plurality of current switching circuits disposed on output ends of the unit current sources; a current wiring having one end connected to the current switching circuits via a first change over switch and the other end connected to a source signal line; and a precharge voltage source which outputs a predetermined voltage and is connected to the current wiring via a second change over switch, wherein the current switching circuits are turned on and off depending on gray scale data of an image signal, and the first and the second change over switches selectively connect either the current switching circuits or the precharge voltage source to the source signal line. - View Dependent Claims (12, 13)
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Specification