Display device

Claim 2

A display device comprising a buffer amplifier, a monitoring EL element, a constant current generator, a plurality of pixels and a power supply line, wherein each of said plurality of pixels has a bottom-gate type TFT and an EL element; each of said monitoring EL element and said EL element has a first electrode, a second electrode and an EL layer interposed between said first electrode and said second electrode; said first electrode of said monitoring EL element is connected to said constant current generator and a non-inversed input terminal of said buffer amplifier; an output terminal of said buffer amplifier is connected to said constant current generator, and an electric potential of said power supply line is provided to said first electrode of said EL element though said bottom-gate type TFT.

Claim 3

A display device comprising a buffer amplifier, a monitoring EL element, a constant current generator, an adder circuit, a plurality of pixels and a power supply line, wherein: each of said plurality of pixels has a bottom-gate type TFT and an EL element; each of said monitoring EL element and said EL element has a first electrode, a second electrode and an EL layer interposed between said first electrode and said second electrode; said first electrode of said monitoring EL element is connected to said constant current generator and a non-inversed input terminal of said buffer amplifier; an output terminal of said buffer amplifier is connected to an input terminal of said adder circuit, an output terminal of said adder circuit is connected to said power supply line; the difference in electric potential between said input terminal of said adder circuit and said output terminal thereof is kept constant; and the electric potential of said power supply line is provided to said first electrode of said EL element though said bottom-gate type TFT.

Claim 4

A display device comprising a buffer amplifier, a monitoring EL element, a constant current generator, an adder circuit, a plurality of pixels and a power supply line, wherein: each of said plurality of pixels has a bottom-gate type TFT and an EL element; each of said monitoring EL element and said EL element has a first electrode, a second electrode and an EL layer interposed between said first electrode and said second electrode; said first electrode of said monitoring EL element is connected to said constant current generator and a non-inversed input terminal of said buffer amplifier; an output terminal of said buffer amplifier is connected to an input terminal of said adder circuit, an output terminal of said adder circuit is connected to said power supply line; the difference in electric potential between said input terminal of said adder circuit and said output terminal thereof is kept constant; and the electric potential of said power supply line is provided to said first electrode of said EL element though said bottom-gate type TFT.

Claim 5

A display device comprising: a monitoring EL element; a plurality of source signal lines; a plurality of gate signal lines; a plurality of power supply lines; a plurality of pixels; a source signal line driving circuit for inputting a signal into said plurality of source signal lines; and a gate signal line driving circuit for inputting a signal to said plurality of gate signal lines, wherein: each of said plurality of pixels has an EL element, a switching TFT, and a driving TFT; each of said monitoring EL element and said EL element has a first electrode, a second electrode, and an EL layer interposed between said first electrode and said second electrode; a gate electrode of said switching TFT is connected to one of said plurality of gate signal lines; one of a source region and a drain region of said switching TFT is connected to one of said plurality of source signal lines, and the other of which is connected to a gate electrode of said driving TFT; one of a source region and a drain region of said driving TFT is connected to one of said plurality of power supply lines, and the other one of which is connected to one of said first electrode and said second electrode of said EL element; and said monitoring EL element is used to reduce a change in amount of current flowing from one of said plural power supply lines into said EL element due to a temperature change.

Claim 6

A display device comprising: a monitoring EL element; a plurality of source signal lines; a plurality of gate signal lines; a plurality of power supply lines; a plurality of pixels; a source signal line driving circuit for inputting a signal into said plurality of source signal lines; and a gate signal line driving circuit for inputting a signal to said plurality of gate signal lines, wherein: each of said plurality of pixels has an EL element, a switching TFT, and a driving TFT; each of said monitoring EL element and said EL element has a first electrode, a second electrode, and an EL layer interposed between said first electrode and said second electrode; a gate electrode of said switching TFT is connected to one of said plurality of gate signal lines; one of a source region and a drain region of said switching TFT is connected to one of said plurality of source signal lines, and the other of which is connected to a gate electrode of said driving TFT; one of a source region and a drain region of said driving TFT is connected to one of said plurality of power supply lines, and the other one of which is connected to one of said first electrode and said second electrode of said EL element; and said monitoring EL element is used to reduce a change in amount of current flowing from one of said plural power supply lines into said EL element due to a temperature change.

Claim 7

A display device comprising: a monitoring EL element; a buffer amplifier; a constant current generator; a plurality of source signal lines; a plurality of gate signal lines; a plurality of power supply lines; a plurality of pixels; a source signal line driving circuit for inputting a signal into said plurality of source signal lines; and a gate signal line driving circuit for inputting a signal to said plurality of gate signal lines, wherein: each of said plurality of pixels has an EL element, a switching TFT and a driving TFT; said source signal line driving circuit has a bottom-gate type TFT; each of said monitoring EL element and said EL element has a first electrode, a second electrode, and an EL layer interposed between said first electrode and said second electrode; a gate electrode of said switching TFT is connected to one of said plurality of gate signal lines; one of a source region and a drain region of said switching TFT is connected to one of said plurality of source signal lines, and the other of which is connected to a gate electrode of said driving TFT; one of a source region and a drain region of said driving TFT is connected to one of said plurality of power supply lines, and the other one of which is connected to said first electrode of said EL element; and a first electrode of said monitoring EL element is connected to said constant current generator and an non-inversed input terminal of said buffer amplifier; an output terminal of said buffer amplifier is connected to said plurality of power supply lines, and the electric potential of said plurality of power supply lines is provided to said first electrode of said EL element though said bottom-gate type TFT of said driving TFT.

Claim 8

A display device comprising: a monitoring EL element; a buffer amplifier; a constant current generator; a plurality of source signal lines; a plurality of gate signal lines; a plurality of power supply lines; a plurality of pixels; a source signal line driving circuit for inputting a signal into said plurality of source signal lines; and a gate signal line driving circuit for inputting a signal to said plurality of gate signal lines, wherein: each of said plurality of pixels has an EL element, a switching TFT and a driving TFT; said source signal line driving circuit has a bottom-gate type TFT; each of said monitoring EL element and said EL element has a first electrode, a second electrode, and an EL layer interposed between said first electrode and said second electrode; a gate electrode of said switching TFT is connected to one of said plurality of gate signal lines; one of a source region and a drain region of said switching TFT is connected to one of said plurality of source signal lines, and the other of which is connected to a gate electrode of said driving TFT; one of a source region and a drain region of said driving TFT is connected to one of said plurality of power supply lines, and the other one of which is connected to said first electrode of said EL element; and a first electrode of said monitoring EL element is connected to said constant current generator and an non-inversed input terminal of said buffer amplifier; an output terminal of said buffer amplifier is connected to said plurality of power supply lines, and the electric potential of said plurality of power supply lines is provided to said first electrode of said EL element though said bottom-gate type TFT of said driving TFT.

Claim 9

A display device comprising: a monitoring EL element; a buffer amplifier; a constant current generator; an adder circuit; a plurality of source signal lines; a plurality of gate signal lines; a plurality of power supply lines; a plurality of pixels; a source signal line driving circuit for inputting a signal into said plurality of source signal lines; and a gate signal line driving circuit for inputting a signal to said plurality of gate signal lines, wherein: said source signal line driving circuit has a bottom-gate type TFT, each of said plurality of pixels has an EL element, a switching TFT, and a driving TFT; each of said monitoring EL element and said EL element has a first electrode, a second electrode, and an EL layer interposed between said first electrode and said second electrode; a gate electrode of said switching TFT is connected to one of said plurality of gate signal lines; one of a source region and a drain region of said switching TFT is connected to one of said plurality of source signal lines, and the other of which is connected to a gate electrode of said driving TFT, one of a source region and a drain region of said driving TFT is connected to one of said plurality of power supply lines, and the other one of which is connected to said first electrode of said EL element; said first electrode of said monitoring EL element is connected to said constant current generator and an non-inversion input terminal of said buffer amplifier; an output terminal of said buffer amplifier is connected to an input terminal of said adder circuit; an output terminal of said adder circuit is connected to one of said plurality of power supply lines; the difference in electric potential between said input terminal of said adder circuit and said output terminal thereof is kept constant; and the electric potential of said plurality of power supply line is provided to said first electrode of said EL element though said driving TFT.

Claim 10

A display device comprising: a monitoring EL element; a buffer amplifier; a constant current generator; an adder circuit; a plurality of source signal lines; a plurality of gate signal lines; a plurality of power supply lines; a plurality of pixels; a source signal line driving circuit for inputting a signal into said plurality of source signal lines; and a gate signal line driving circuit for inputting a signal to said plurality of gate signal lines, wherein: said source signal line driving circuit has a bottom-gate type TFT, each of said plurality of pixels has an EL element, a switching TFT, and a driving TFT; each of said monitoring EL element and said EL element has a first electrode, a second electrode, and an EL layer interposed between said first electrode and said second electrode; a gate electrode of said switching TFT is connected to one of said plurality of gate signal lines; one of a source region and a drain region of said switching TFT is connected to one of said plurality of source signal lines, and the other of which is connected to a gate electrode of said driving TFT, one of a source region and a drain region of said driving TFT is connected to one of said plurality of power supply lines, and the other one of which is connected to said first electrode of said EL element; said first electrode of said monitoring EL element is connected to said constant current generator and an non-inversion input terminal of said buffer amplifier; an output terminal of said buffer amplifier is connected to an input terminal of said adder circuit; an output terminal of said adder circuit is connected to one of said plurality of power supply lines; the difference in electric potential between said input terminal of said adder circuit and said output terminal thereof is kept constant; and the electric potential of said plurality of power supply line is provided to said first electrode of said EL element though said driving TFT.

Claim 11

A display device according to claim 3 wherein said source signal line driving circuit has means for successively sampling digital signals.

Claim 12

A display device according to claim 3 , wherein said source signal line driving circuit has means for successively sampling digital signals that have been subjected to k-fold time expansion (k is a natural number), the sampling being perform ed simultaneously on k digital signals.

Claim 13

A display device according to claim 3 , wherein said source signal line driving circuit has means for successively sampling analog signals.

Claim 14

A display device according to claim 3 , wherein said source signal line driving circuit has means for successively sampling analog signals that have been subjected to k- fold time expansion (k is a natural number), the sampling being performed simultaneously on k analog signals.

Claim 15

A display device according to claim 1 , wherein said first electrode is an anode and said second electrode is a cathode in both of said monitoring EL element and said EL element.

Claim 16

A display device according to claim 1 , wherein said first electrode is a cathode and said second electrode is an anode in both of said monitoring EL element and said EL element.

Claim 17

A display device according to claim 1 , wherein at least one of said buffer amplifier and said constant current generator is composed of a thin film transistor.

Claim 18

A display device according to claim 2 , wherein at least one of said buffer amplifier, said constant current generator and said adder circuit is composed of a thin film transistor.

Claim 19

A display device according to claim 1 , wherein said EL element has an EL layer emitting monochrome light and color conversion layers in combination to provide color display.

Claim 20

A display device according to claim 1 , wherein said EL element has an EL layer emitting white light and color filters in combination to provide color display.

Claim 21

A display device according to claim 1 , wherein said EL layer of said EL element is formed from a low molecular weight organic material or a polymer organic material.

Claim 22

A display device according to claim 16 , wherein said low molecular weight organic material contains Alq 3 (tris-8-quinolilite-aluminum) or TPD (triphenylamine derivative).

Claim 23

A display device according to claim 16 , wherein said polymer organic material contains PPV (polyphenylene vinylene), PVK (polyvinyl carbazole) or polycarbonate.

Claim 24

A display device according to claim 1 , wherein said EL layer of said EL element is formed from an inorganic material.

Claim 25

A display device according to claim 1 , wherein said display device is incorporated into an electronic equipment selected from the group consisting of a personal computer, a video camera, a head mounted display, an image play back device, and a mobile computer.

Claim 26

A display device according to claim 4 wherein said source signal line driving circuit has means for successively sampling digital signals.

Claim 27

A display device according to claim 5 wherein said source signal line driving circuit has means for successively sampling digital signals.

Claim 28

A display device according to claim 4 , wherein said source signal line driving circuit has means for successively sampling digital signals that have been subjected to k-fold time expansion (k is a natural number), the sampling being perform ed simultaneously on k digital signals.

Claim 29

A display device according to claim 5 , wherein said source signal line driving circuit has means for successively sampling digital signals that have been subjected to k-fold time expansion (k is a natural number), the sampling being perform ed simultaneously on k digital signals.

Claim 30

A display device according to claim 4 , wherein said source signal line driving circuit has means for successively sampling analog signals.

Claim 31

A display device according to claim 5 , wherein said source signal line driving circuit has means for successively sampling analog signals.

Claim 32

A display device according to claim 4 , wherein said source signal line driving circuit has means for successively sampling analog signals that have been subjected to k-fold time expansion (k is a natural number), the sampling being performed simultaneously on k analog signals.

Claim 33

A display device according to claim 5 , wherein said source signal line driving circuit has means for successively sampling analog signals that have been subjected to k-fold time expansion (k is a natural number), the sampling being performed simultaneously on k analog signals.

Claim 34

A display device according to claim 2 , wherein said first electrode is an anode and said second electrode is a cathode in both of said monitoring EL element and said EL element.

Claim 35

A display device according to claim 3 , wherein said first electrode is an anode and said second electrode is a cathode in both of said monitoring EL element and said EL element.

Claim 36

A display device according to claim 4 , wherein said first electrode is an anode and said second electrode is a cathode in both of said monitoring EL element and said EL element.

Claim 37

A display device according to claim 5 , wherein said first electrode is an anode and said second electrode is a cathode in both of said monitoring EL element and said EL element.

Claim 38

A display device according to claim 2 , wherein said first electrode is a cathode and said second electrode is an anode in both of said monitoring EL element and said EL element.

Claim 39

A display device according to claim 3 , wherein said first electrode is a cathode and said second electrode is an anode in both of said monitoring EL element and said EL element.

Claim 40

A display device according to claim 4 , wherein said first electrode is a cathode and said second electrode is an anode in both of said monitoring EL element and said EL element.

Claim 41

A display device according to claim 5 , wherein said first electrode is a cathode and said second electrode is an anode in both of said monitoring EL element and said EL element.

Claim 42

A display device according to claim 2 , wherein at least one of said buffer amplifier and said constant current generator is composed of a thin film transistor.

Claim 43

A display device according to claim 3 , wherein at least one of said buffer amplifier and said constant current generator is composed of a thin film transistor.

Claim 44

A display device according to claim 4 , wherein at least one of said buffer amplifier and said constant current generator is composed of a thin film transistor.

Claim 45

A display device according to claim 3 , wherein at least one of said buffer amplifier, said constant current generator and said adder circuit is composed of a thin film transistor.

Claim 46

A display device according to claim 4 , wherein at least one of said buffer amplifier, said constant current generator and said adder circuit is composed of a thin film transistor.

Claim 47

A display device according to claim 5 , wherein at least one of said buffer amplifier, said constant current generator and said adder circuit is composed of a thin film transistor.

Claim 48

A display device according to claim 2 , wherein said EL element has an EL layer emitting monochrome light and color conversion layers in combination to provide color display.

Claim 49

A display device according to claim 3 , wherein said EL element has an EL layer emitting monochrome light and color conversion layers in combination to provide color display.

Claim 50

A display device according to claim 4 , wherein said EL element has an EL layer emitting monochrome light and color conversion layers in combination to provide color display.

Claim 51

A display device according to claim 5 , wherein said EL element has an EL layer emitting monochrome light and color conversion layers in combination to provide color display.

Claim 52

A display device according to claim 2 , wherein said EL element has an EL layer emitting white light and color filters in combination to provide color display.

Claim 53

A display device according to claim 3 , wherein said EL element has an EL layer emitting white light and color filters in combination to provide color display.

Claim 54

A display device according to claim 4 , wherein said EL element has an EL layer emitting white light and color filters in combination to provide color display.

Claim 55

A display device according to claim 5 , wherein said EL element has an EL layer emitting white light and color filters in combination to provide color display.

Claim 56

A display device according to claim 2 , wherein said EL layer of said EL element is formed from a low molecular weight organic material or a polymer organic material.

Claim 57

A display device according to claim 3 , wherein said EL layer of said EL element is formed from a low molecular weight organic material or a polymer organic material.

Claim 58

A display device according to claim 4 , wherein said EL layer of said EL element is formed from a low molecular weight organic material or a polymer organic material.

Claim 59

A display device according to claim 5 , wherein said display device is incorporated into an electronic equipment selected from the group consisting of a personal computer, a video camera, a head mounted display, an image play back device, and a mobile computer.

Claim 60

A display device according to claim 5 , wherein said EL layer of said EL element is formed from a low molecular weight organic material or a polymer organic material.

Claim 61

A display device according to claim 2 , wherein said EL layer of said EL element is formed from an inorganic material.

Claim 62

A display device according to claim 3 , wherein said EL layer of said EL element is formed from an inorganic material.

Claim 63

A display device according to claim 4 , wherein said EL layer of said EL element is formed from an inorganic material.

Claim 64

A display device according to claim 5 , wherein said EL layer of said EL element is formed from an inorganic material.

Claim 65

A display device according to claim 2 , wherein said display device is incorporated into an electronic equipment selected from the group consisting of a personal computer, a video camera, a head mounted display, an image play back device, and a mobile computer.

Claim 66

A display device according to claim 3 , wherein said display device is incorporated into an electronic equipment selected from the group consisting of a personal computer, a video camera, a head mounted display, an image play back device, and a mobile computer.

Claim 67

A display device according to claim 4 , wherein said display device is incorporated into an electronic equipment selected from the group consisting of a personal computer, a video camera, a head mounted display, an image play back device, and a mobile computer.