Display device and method for driving the same
First Claim
Patent Images
1. A display device comprising:
- a light emitting element;
means for holding a voltage based on a video signal;
a power source line connected to the means for holding the voltage through at least one switching element; and
a transistor supplying a current based on the held voltage to the light emitting element, wherein the held voltage is a potential difference between a potential of the video signal and a potential of the power source line.
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Abstract
A semiconductor device having a configuration hardly generating variations in the current value due to a deteriorated EL element is to be provided. A capacitance element is disposed between the gate and the source of a driving TFT, video signals are inputted to the gate electrode, and then it is in the floating state. At this time, when the gate-source voltage of the driving TFT exceeds the threshold, the driving TFT is turned on. Suppose an EL element is deteriorated and the anode potential rises, that is, the source potential of the driving TFT rises, the potential of the gate electrode of the driving TFT, being in the floating state by coupling of the capacitance element, is to rise by the same amount. Accordingly, even when the anode potential rises due to the deteriorated EL element, the rise is added to the gate electrode potential as it is, and the gate-source voltage of the driving TFT is allowed to be constant.
406 Citations
104 Claims
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1. A display device comprising:
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a light emitting element;
means for holding a voltage based on a video signal;
a power source line connected to the means for holding the voltage through at least one switching element; and
a transistor supplying a current based on the held voltage to the light emitting element, wherein the held voltage is a potential difference between a potential of the video signal and a potential of the power source line. - View Dependent Claims (2, 3)
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4. A display device comprising:
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a light emitting element;
a transistor, a source electrode of the transistor connected to one electrode of the light emitting element;
a capacitance element connected between the source electrode and a gate electrode of the transistor; and
a power source line connected to a drain electrode of the transistor. - View Dependent Claims (5, 6)
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7. A display device comprising a pixel having a light emitting element, the pixel comprising:
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a first and second switching elements, each of the elements having two states, a conducting state and a non-conducting state;
a transistor; and
a capacitance element, wherein a video signal is inputted to a first electrode of the first switching element, and a second electrode of the first switching element is electrically connected to a gate electrode of the transistor, wherein a first electrode of the transistor is electrically connected to a first electrode of the second switching element and a first electrode of the light emitting element, and a second electrode of the transistor is electrically connected to a current supply line, wherein a second electrode of the second switching element is electrically connected to a first power source line, wherein a second electrode of the light emitting element is electrically connected to a second power source line, and wherein the capacitance element is disposed between the gate electrode and the first electrode of the transistor. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A display device comprising a pixel having a light emitting element, the pixel comprising:
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first, second and third switching elements, each of the elements having two states, a conducting state and a non-conducting state;
a transistor; and
a capacitance element, wherein a video signal is inputted to a first electrode of the first switching element, and a second electrode of the first switching element is electrically connected to a gate electrode of the transistor, wherein a first electrode of the transistor is electrically connected to a first electrode of the second switching element and a first electrode of the light emitting element, and a second electrode of the transistor is electrically connected to a current supply line, wherein a second electrode of the second switching element is electrically connected to a first power source line, wherein a second electrode of the light emitting element is electrically connected to a second power source line, wherein the capacitance element is disposed between the gate electrode and the first electrode of the transistor, and wherein a first electrode of the third switching element is electrically connected to the gate electrode of the transistor, and a second electrode of the third switching element is electrically connected to any one of the first electrode of the transistor, the first electrode of the second switching element, and the first electrode of the light emiting element. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A display device comprising a pixel having a light emitting element, the pixel comprising:
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first, second and third switching elements, each of the elements having two states, a conducting state and a non-conducting state;
a transistor; and
a capacitance element, wherein a video signal is inputted to a first electrode of the first switching element, and a second electrode of the first switching element is electrically connected to a gate electrode of the transistor, wherein a first electrode of the transistor is electrically connected to a first electrode of the second switching element and a first electrode of the light emitting element, and a second electrode of the transistor is electrically connected to a current supply line, wherein a second electrode of the second switching element is electrically connected to a first power source line, wherein a second electrode of the light emitting element is electrically connected to a second power source line, wherein the capacitance element is disposed between the gate electrode and the first electrode of the transistor, and wherein a first electrode of the third switching element is electrically connected to the first electrode of the light emitting element, and a second electrode of the third switching element is electrically connected to the first power source line. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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28. A display device comprising a pixel having a light emitting element, the pixel comprising:
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first, second and third switching elements, each of the elements having two states, a conducting state and a non-conducting state;
a transistor; and
a capacitance element, wherein a video signal is inputted to a first electrode of the first switching element, and a second electrode of the first switching element is electrically connected to a gate electrode of the transistor, wherein a first electrode of the transistor is electrically connected to a first electrode of the second switching element and a first electrode of the light emitting element, and a second electrode of the transistor is electrically connected to a current supply line through the third switching element, wherein a second electrode of the second switching element is electrically connected to a first power source line, wherein a second electrode of the light emitting element is electrically connected to a second power source line, and wherein the capacitance element is disposed between the gate electrode and the first electrode of the transistor. - View Dependent Claims (29, 30, 31, 32, 33, 34)
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35. A display device comprising a pixel having a light emitting element, the pixel comprising:
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a source signal line;
first and second gate signal lines;
a current supply line;
first, second, and third transistors; and
a capacitance element, wherein a gate electrode of the first transistor is electrically connected to the first gate signal line, a first electrode of the first transistor is electrically connected to a first electrode of the second transistor and a first electrode of the light emitting element, and a second electrode of the first transistor is electrically connected to a first power source line having a potential difference with the current supply line each other, or first or second gate signal lines in any one of pixels not including the pixel, wherein a gate electrode of the second transistor is electrically connected to a first electrode of the third transistor, and a second electrode of the second transistor is electrically connected to the current supply line, wherein a gate electrode of the third transistor is electrically connected to the second gate signal line, and a second electrode of the third transistor is electrically connected to the source signal line, wherein a second electrode of the light emitting element is electrically connected to a second power source line having a potential difference with the current supply line each other, and wherein the capacitance element is disposed between the gate electrode and the first electrode of the second transistor. - View Dependent Claims (36, 37, 38, 39, 40, 41)
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42. A display device comprising a pixel having a light emitting element, the pixel comprising:
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a source signal line;
a gate signal line;
a current supply line;
first, second, and third transistors; and
a capacitance element, wherein a gate electrode of the first transistor is electrically connected to the gate signal line, a first electrode of the first transistor is electrically connected to a first electrode of the second transistor and a first electrode of the light emitting element, and a second electrode of the first transistor is electrically connected to a first power source line having a potential difference with the current supply line each other or the gate signal line in any one of pixels not including the pixel, wherein a gate electrode of the second transistor is electrically connected to a first electrode of the third transistor, and a second electrode of the second transistor is electrically connected to the current supply line, wherein a gate electrode of the third transistor is electrically connected to the gate signal line, and a second electrode of the third transistor is electrically connected to the source signal line, wherein a second electrode of the light emitting element is electrically connected to a second power source line having a potential difference with the current supply line each other, and wherein the capacitance element is disposed between the gate electrode and the first electrode of the second transistor. - View Dependent Claims (43, 44, 45, 46, 47, 48, 49)
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50. A display device comprising a pixel having a light emitting element, the pixel comprising:
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a source signal line;
first, second and third gate signal lines;
a current supply line;
first, second, third and fourth transistors; and
a capacitance element, wherein a gate electrode of the first transistor is electrically connected to the first gate signal line, a first electrode of the first transistor is electrically connected to a first electrode of the second transistor and a first electrode of the light emitting element, and a second electrode of the first transistor is electrically connected to any one of a first power source having a potential difference with the current supply line each other, the first, second and third gate signal lines in any one of pixels not including the pixel, and the second and third gate signal lines in the pixel, wherein a gate electrode of the second transistor is electrically connected to a first electrode of the third transistor, and a second electrode of the second transistor is electrically connected to the current supply line, wherein a gate electrode of the third transistor is electrically connected to the second gate signal line, and a second electrode of the third transistor is electrically connected to the source signal line, wherein a second electrode of the light emitting element is electrically connected to a second power source line having a potential difference with the current supply line each other, wherein the capacitance element is disposed between the gate electrode and the first electrode of the second transistor, and wherein a gate electrode of the fourth transistor is electrically connected to the third gate signal line, a first electrode of the fourth transistor is electrically connected to the gate electrode of the second transistor, and a second electrode of the fourth transistor is electrically connected to any one of the first electrode of the second transistor, the first power source line, and the second power source line. - View Dependent Claims (51, 52, 53, 54, 55, 56)
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57. A display device comprising a pixel having a light emitting element, the pixel comprising:
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source signal line;
first and second gate signal lines;
a current supply line;
first, second, third and fourth transistors; and
a capacitance element, wherein a gate electrode of the first transistor is electrically connected to the first gate signal line, a first electrode of the first transistor is electrically connected to a first electrode of the second transistor and a first electrode of the light emitting element, and a second electrode of the first transistor is electrically connected to any one of a first power source line having a potential difference with the current supply line each other, the first and second gate signal lines in any one of pixels not including the pixel, and the second gate signal line in a the pixel, wherein a gate electrode of the second transistor is electrically connected to a first electrode of the third transistor, and a second electrode of the second transistor is electrically connected to the current supply line, wherein a gate electrode of the third transistor is electrically connected to the first gate signal line, and a second electrode of the third transistor is electrically connected to the source signal line, wherein a second electrode of the light emitting element is electrically connected to a second power source line having a potential difference with the current supply line each other, wherein the capacitance element is disposed between the gate electrode and the first electrode of the second transistor, and wherein a gate electrode of the fourth transistor is electrically connected to the second gate signal line, a first electrode of the fourth transistor is electrically connected to the gate electrode of the second transistor, and a second electrode of the fourth transistor is electrically connected to any one of the first electrode of the second transistor, the first power source line, and the second power source line. - View Dependent Claims (58, 59, 60, 61, 62, 63, 64)
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65. A display device comprising a pixel having a light emitting element, the pixel comprising:
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a source signal line;
first, second and third gate signal lines;
a current supply line;
first, second, third and fourth transistors; and
a capacitance element, wherein a gate electrode of the first transistor is electrically connected to the first gate signal line, a first electrode of the first transistor is electrically connected to a first electrode of the second transistor and a first electrode of the light emitting element, and a second electrode of the first transistor is electrically connected to any one of a first power source line having a potential difference with the current supply line each other, the first, second and third gate signal lines in any one of pixels not including the pixel, and the second and third gate signal lines in the pixel, wherein a gate electrode of the second transistor is electrically connected to a first electrode of the third transistor, and a second electrode of the second transistor is electrically connected to the current supply line, wherein a gate electrode of the third transistor is electrically connected to the second gate signal line, and a second electrode of the third transistor is electrically connected to the source signal line, wherein a second electrode of the light emitting element is electrically connected to a second power source line having a potential difference with the current supply line each other, wherein the capacitance element is disposed between the gate electrode and the first electrode of the second transistor, and wherein a gate electrode of the fourth transistor is electrically connected to the third gate signal line, a first electrode of the fourth transistor is electrically connected to the first electrode of the light emitting element, and a second electrode of the fourth transistor is electrically connected to the first power source line. - View Dependent Claims (66, 67, 68, 69, 70, 71)
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72. A display device comprising a pixel having a light emitting element, the pixel comprising:
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a source signal line;
first and second gate signal lines;
a current supply line;
first, second, third and fourth transistors; and
a capacitance element, wherein a gate electrode of the first transistor is electrically connected to the first gate signal line, a first electrode of the first transistor is electrically connected to a first electrode of the second transistor and a first electrode of the light emitting element, and a second electrode of the first transistor is electrically connected to any one of a first power source line having a potential difference with the current supply line each other, the first and second gate signal lines in any one of pixels not including the pixel, and the second gate signal line in the pixel, wherein a gate electrode of the second transistor is electrically connected to a first electrode of the third transistor, and a second electrode of the second transistor is electrically connected to the current supply line, wherein a gate electrode of the third transistor is electrically connected to the first gate signal line, and a second electrode of the third transistor is electrically connected to the source signal line, wherein a second electrode of the light emitting element is electrically connected to a second power source line having a potential difference with the current supply line each other, wherein the capacitance element is disposed between the gate electrode and the first electrode of the second transistor, and wherein a gate electrode of the fourth transistor is electrically connected to the second gate signal line, a first electrode of the fourth transistor is electrically connected to the first electrode of the light emitting element, and a second electrode of the fourth transistor is electrically connected to the first power source line. - View Dependent Claims (73, 74, 75, 76, 77, 78, 79)
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80. A display device comprising a pixel having a light emitting element, the pixel comprising:
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a source signal line;
first, second and third gate signal lines;
a current supply line;
first, second, third and fourth transistors; and
a capacitance element, wherein a gate electrode of the first transistor is electrically connected to the first gate signal line, a first electrode of the first transistor is electrically connected to a first electrode of the second transistor and a first electrode of the light emitting element, and a second electrode of the first transistor is electrically connected to any one of a first power source line having a potential difference with the current supply line each other, the first, second and third gate signal lines in any one of pixels not including the pixel, and the second and third gate signal lines in the pixel, wherein a gate electrode of the second transistor is electrically connected to a first electrode of the third transistor, and a second electrode of the second transistor is electrically connected to the current supply line, wherein a gate electrode of the third transistor is electrically connected to the second gate signal line, and a second electrode of the third transistor is electrically connected to the source signal line, wherein a second electrode of the light emitting element is electrically connected to a second power source line having a potential difference with the current supply line, wherein the capacitance element is disposed between the gate electrode and the first electrode of the second transistor, the capacitance element holds voltage between the gate electrode and the first electrode of the second transistor, and wherein the fourth transistor is disposed between the second electrode of the second transistor and the current supply line, or between the first electrode of the second transistor and the first electrode of the light emitting element, and a gate electrode of the fourth transistor is electrically connected to the third gate signal line. - View Dependent Claims (81, 82, 83, 84, 85, 86)
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87. A display device comprising a pixel having a light emitting element, the pixel comprising:
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a source signal line;
first and second gate signal lines;
a current supply line;
first, second, third and fourth transistors; and
a capacitance element, wherein a gate electrode of the first transistor is electrically connected to the first gate signal line, a first electrode of the first transistor is electrically connected to a first electrode of the second transistor and a first electrode of the light emitting element, and a second electrode of the first transistor is electrically connected to any one of a first power source line having a potential difference with the current supply line each other, the first and second gate signal lines in any one of pixels not including the pixel, and the second gate signal line in the pixel, wherein a gate electrode of the second transistor is electrically connected to a first electrode of the third transistor, and a second electrode of the second transistor is electrically connected to the current supply line, wherein a gate electrode of the third transistor is electrically connected to the first gate signal line, and a second electrode of the third transistor is electrically connected to the source signal line, wherein a second electrode of the light emitting element is electrically connected to a second power source line having a potential difference with the current supply line each other, wherein the capacitance element is disposed between the gate electrode and the first electrode of the second transistor, the capacitance element holds voltage between the gate electrode and the first electrode of the second transistor, and wherein the fourth transistor is disposed between the second electrode of the second transistor and the current supply line, or between the first electrode of the second transistor and the first electrode of the light emitting element, and a gate electrode of the fourth transistor is electrically connected to the second gate signal line. - View Dependent Claims (88, 89, 90, 91, 92, 93, 94)
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95. A method for driving a display device,
the display comprising: -
a light emitting element;
a transistor, a source electrode of the transistor connected to one electrode of the light emitting element;
a capacitance element connected between the source electrode and a gate electrode of the transistor; and
a power source line connected to a drain electrode of the transistor, the method comprising;
allowing the capacitance element to hold gate-source voltage of the transistor and to supply current to the light emitting element based on the held voltage. - View Dependent Claims (96)
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97. A method for driving a display device comprising a pixel having a light emitting element, the pixel comprising:
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a first and second switching elements, each of the elements having two states, a conducting state and a non-conducting state;
a transistor; and
a capacitance element, wherein a video signal is inputted to a first electrode of the first switching element, and a second electrode of the first switching element is electrically connected to a gate electrode of the transistor, wherein a first electrode of the transistor is electrically connected to a first electrode of the second switching element and a first electrode of the light emitting element, and a second electrode of the transistor is electrically connected to a current supply line, wherein a second electrode of the second switching element is electrically connected to a first power source line, wherein a second electrode of the light emitting element is electrically connected to a second power source line, and wherein the capacitance element is disposed between the gate electrode and the first electrode of the transistor, the method comprising;
conducting the first and second switching elements to input the video signal to the gate electrode of the transistor;
fixing potential of the first electrode of the transistor;
not conducting the first and second switching elements to allow the gate electrode of the transistor to be in a floating state; and
supplying current corresponding to potential applied to the gate electrode of the transistor to the light emitting element to emit light, wherein in the supplying current, the capacitance element holds gate-source voltage of the transistor to allow a potential variation of the first electrode of the transistor to be equal to a potential variation of the gate electrode of the transistor. - View Dependent Claims (98)
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99. A method for driving a display device comprising a pixel having a light emitting element, the pixel comprising:
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first, second and third switching elements, each of the elements having two states, a conducting state and a non-conducting state;
a transistor; and
a capacitance element, wherein a video signal is inputted to a first electrode of the first switching element, and a second electrode of the first switching element is electrically connected to a gate electrode of the transistor, wherein a first electrode of the transistor is electrically connected to a first electrode of the second switching element and a first electrode of the light emitting element, and a second electrode of the transistor is electrically connected to a current supply line, wherein a second electrode of the second switching element is electrically connected to a first power source line, wherein a second electrode of the light emitting element is electrically connected to a second power source line, wherein the capacitance element is disposed between the gate electrode and the first electrode of the transistor, and wherein a first electrode of the third switching element is electrically connected to the gate electrode of the transistor, and a second electrode of the third switching element is electrically connected to any one of the first electrode of the transistor, the first electrode of the second switching element, and the first electrode of the light emiting element, the method comprising;
conducting the first and second switching elements to input the video signal to the gate electrode of the transistor;
fixing potential of the first electrode of the transistor;
not conducting the first and second switching elements to allow the gate electrode of the transistor to be in a floating state;
supplying current corresponding to potential applied to the gate electrode of the transistor to the light emitting element to emit light;
conducting the third switching element to allow gate-source voltage of the transistor to be equal to or below an absolute value of a threshold voltage; and
stopping current supply to the light emitting element, wherein in the supplying current, the capacitance element holds the gate-source voltage of the transistor to allow a potential variation of the first electrode of the transistor to be equal to a potential variation of the gate electrode of the transistor. - View Dependent Claims (100)
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101. A method for driving a display device comprising a pixel having a light emitting element, the pixel comprising:
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first, second and third switching elements, each of the elements having two states, a conducting state and a non-conducting state;
a transistor; and
a capacitance element, wherein a video signal is inputted to a first electrode of the first switching element, and a second electrode of the first switching element is electrically connected to a gate electrode of the transistor, wherein a first electrode of the transistor is electrically connected to a first electrode of the second switching element and a first electrode of the light emitting element, and a second electrode of the transistor is electrically connected to a current supply line, wherein a second electrode of the second switching element is electrically connected to a first power source line, wherein a second electrode of the light emitting element is electrically connected to a second power source line, wherein the capacitance element is disposed between the gate electrode and the first electrode of the transistor, and wherein a first electrode of the third switching element is electrically connected to the first electrode of the light emitting element, and a second electrode of the third switching element is electrically connected to the first power source line, the method comprising;
conducting the first and second switching elements to input the video signal to the gate electrode of the transistor;
fixing potential of the first electrode of the transistor;
not conducting the first and second switching elements to allow the gate electrode of the transistor to be in a floating state;
supplying current corresponding to potential applied to the gate electrode of the transistor to the light emitting element to emit light;
conducting the third switching element to allow gate-source voltage of the transistor to be equal to or below an absolute value of a threshold voltage; and
stopping current supply to the light emitting element, wherein in the supplying current, the capacitance element holds the gate-source voltage of the transistor to allow a potential variation of the first electrode of the transistor to be equal to a potential variation of the gate electrode of the transistor. - View Dependent Claims (102)
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103. A method for driving a display device comprising a pixel having a light emitting element, the pixel comprising:
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first, second and third switching elements, each of the elements having two states, a conducting state and a non-conducting state;
a transistor; and
a capacitance element, wherein a video signal is inputted to a first electrode of the first switching element, and a second electrode of the first switching element is electrically connected to a gate electrode of the transistor, wherein a first electrode of the transistor is electrically connected to a first electrode of the second switching element and a first electrode of the light emitting element, and a second electrode of the transistor is electrically connected to a current supply line through the third switching element, wherein a second electrode of the second switching element is electrically connected to a first power source line, wherein a second electrode of the light emitting element is electrically connected to a second power source line, and wherein the capacitance element is disposed between the gate electrode and the first electrode of the transistor, the method for comprising;
conducting the first and second switching elements to input the video signal to the gate electrode of the transistor;
fixing potential of the first electrode of the transistor;
not conducting the first and second switching elements to allow the gate electrode of the transistor to be in a floating state;
conducting the third switching element to supply current corresponding to potential applied to the gate electrode of the transistor to the light emitting element to emit light;
not conducting the third switching element; and
stopping current supply to the light emitting element, wherein in the conducting the third switching element, the capacitance element holds gate-source voltage of the transistor to allow a potential variation of the first electrode of the transistor to be equal to a potential variation of the gate electrode of the transistor. - View Dependent Claims (104)
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Specification
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Current AssigneeSemiconductor Energy Laboratory Co., Ltd.
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Original AssigneeSemiconductor Energy Laboratory Co., Ltd.
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InventorsKimura, Hajime
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current345/211
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CPC Class CodesG09G 2300/0426 Layout of electrodes and co...G09G 2300/0842 forming a memory circuit, e...G09G 2310/0251 Precharge or discharge of p...G09G 2310/0256 with the purpose of reversi...G09G 2310/027 Details of drivers for data...G09G 2310/061 for resetting or blankingG09G 2320/043 Preventing or counteracting...G09G 2330/08 Fault-tolerant or redundant...G09G 2330/10 Dealing with defective pixelsG09G 3/2022 using sub-framesG09G 3/3233 with pixel circuitry contro...G09G 3/3266 Details of drivers for scan...G09G 3/3291 in which the data driver su...H01L 27/1255 integrated with passive dev...H04W 52/027 by controlling a display op...H10K 59/12 Active-matrix OLED [AMOLED]...Y02D 30/70 in wireless communication n...
