Light emitting device and electronic appliance
First Claim
Patent Images
1. A light emitting device comprising:
- a first transistor;
a second transistor;
an OLED; and
a power source line, wherein gate electrodes of the first transistor and the second transistor are connected with each other, source areas of the first transistor and the second transistor are both connected with the power source line, a drain area of the second transistor is connected with a pixel electrode of the OLED, the first and second transistors are operated in a saturated area, and a period with the gate electrode and the drain area of the first transistor are connected is provided in one frame period.
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Abstract
The present invention is to provide a light emitting device capable of obtaining a certain luminance without influence by the temperature change, and a driving method thereof. A current mirror circuit formed by using a transistor is provided for each pixel. The first transistor and the second transistor of the current mirror circuit are connected such that the drain currents thereof are maintained at proportional values regardless of the load resistance value. Thereby, a light emitting device capable of controlling the OLED driving current and the luminance of the OLED by controlling the drain current of the first transistor at a value corresponding to a video signal in a driving circuit, and supplying the drain current of the second transistor to the OLED, is provided.
296 Citations
197 Claims
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1. A light emitting device comprising:
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a first transistor;
a second transistor;
an OLED; and
a power source line, wherein gate electrodes of the first transistor and the second transistor are connected with each other, source areas of the first transistor and the second transistor are both connected with the power source line, a drain area of the second transistor is connected with a pixel electrode of the OLED, the first and second transistors are operated in a saturated area, and a period with the gate electrode and the drain area of the first transistor are connected is provided in one frame period. - View Dependent Claims (2, 3, 4, 54, 55, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85)
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5. A light emitting device comprising:
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a first transistor;
a second transistor;
an OLED; and
a power source line, wherein gate electrodes of the first transistor and the second transistor are connected with each other, source areas of the first transistor and the second transistor are both connected with the power source line, a drain area of the second transistor is connected with a pixel electrode of the OLED, the first and second transistors are operated in a saturated area, a period with the gate electrode and the drain area of the first transistor are connected is provided in one frame period, and luminance of the OLED is controlled by controlling a size of the drain current of the first transistor by a video signal in the period with the gate electrode and the drain area of the first transistor are connected. - View Dependent Claims (6, 56, 86, 87, 88, 89, 90, 91, 92)
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7. A light emitting device comprising:
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a first transistor;
a second transistor;
a third transistor;
a fourth transistor;
an OLED;
a power source line;
a signal line; and
a scanning line, wherein gate electrodes of the third transistor and the fourth transistor are connected with the scanning line, one of source area and drain area of the third transistor is connected with the signal line, and the other one is connected with the drain area of the first transistor, one of source area and drain area of the fourth transistor is connected with the signal line, and the other one is connected with a gate electrode of the first transistor, gate electrodes of the first transistor and the second transistor are connected with each other, source areas of the first transistor and the second transistor are both connected with the power source line, a drain area of the second transistor is connected with a pixel electrode of the OLED, and the first and second transistors are operated in a saturated area. - View Dependent Claims (8, 9, 33, 35, 36, 38, 39, 57, 66, 67, 93, 94, 95, 96, 97, 98, 99, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169)
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10. A light emitting device comprising:
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a first transistor;
a second transistor;
a third transistor;
a fourth transistor;
an OLED;
a power source line;
a signal line; and
a scanning line, wherein gate electrodes of the third transistor and the fourth transistor are connected with the scanning line, one of source area and drain area of the third transistor is connected with the signal line, and the other one is connected with a drain area of the first transistor, one of source area and drain area of the fourth transistor is connected with the signal line, and the other one is connected with the gate electrode of the first transistor, gate electrodes of the first transistor and the second transistor are connected with each other, source areas of the first transistor and the second transistor are both connected with the power source line, a drain area of the second transistor is connected with a pixel electrode of the OLED, the first and second transistors are operated in a saturated area, and luminance of the OLED is controlled by controlling a size of the drain current of the first transistor. - View Dependent Claims (11, 12, 14, 15, 17, 18, 20, 21, 58, 59, 60, 61, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127)
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13. A light emitting device comprising:
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a first transistor;
a second transistor;
a third transistor;
a fourth transistor;
an OLED;
a power source line;
a signal line; and
a scanning line, wherein gate electrodes of the third transistor and the fourth transistor are connected with the scanning line, one of the source area and the drain area of the third transistor is connected with the signal line, and the other one is connected with a drain area of the first transistor, one of the source area and the drain area of the fourth transistor is connected with the signal line, and the other one is connected with the gate electrode of the first transistor, the gate electrodes of the first transistor and the second transistor are connected with each other, source areas of the first transistor and the second transistor are both connected with the power source line, a drain area of the second transistor is connected with a pixel electrode of the OLED, the first and second transistors are operated in a saturated area, and luminance of the OLED is controlled by controlling a size of a drain current of the first transistor by a video signal.
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16. A light emitting device comprising:
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a first transistor;
a second transistor;
a third transistor;
a fourth transistor;
an OLED;
a power source line;
a signal line; and
a scanning line, wherein gate electrodes of the third transistor and the fourth transistor are connected with the scanning line, one of source area and drain area of the third transistor is connected with the signal line, and the other one is connected with a drain area of the first transistor, one of source area and drain area of the fourth transistor is connected with a drain area of the first transistor, and the other one is connected with a gate electrode of the first transistor, the gate electrodes of the first transistor and the second transistor are connected with each other, source areas of the first transistor and the second transistor are both connected with the power source line, a drain area of the second transistor is connected with a pixel electrode of the OLED, and the first and second transistors are operated in a saturated area.
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19. A light emitting device comprising:
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a first transistor;
a second transistor;
a third transistor;
a fourth transistor;
an OLED;
a power source line;
a signal line; and
a scanning line, wherein gate electrodes of the third transistor and the fourth transistor are connected with the scanning line, one of source area and drain area of the third transistor is connected with the signal line, and the other one is connected with a drain area of the first transistor, one of source area and drain area of the fourth transistor is connected with a drain area of the first transistor, and the other one is connected with a gate electrode of the first transistor, the gate electrodes of the first transistor and the second transistor are connected with each other, source areas of the first transistor and the second transistor are both connected with the power source line, drain area of the second transistor is connected with a pixel electrode of the OLED, and the first and second transistors are operated in a saturated area, and luminance of the OLED is controlled by controlling a size of the drain current of the first transistor.
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22. A light emitting device comprising:
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a first transistor;
a second transistor;
a third transistor;
a fourth transistor;
an OLED;
a power source line;
a signal line; and
a scanning line, wherein gate electrodes of the third transistor and the fourth transistor are connected with the scanning line, one of source area and drain area of the third transistor is connected with the signal line, and the other one is connected with a drain area of the first transistor, one of source area and drain area of the fourth transistor is connected with a drain area of the first transistor, and the other one is connected with a gate electrode of the first transistor, the gate electrodes of the first transistor and the second transistor are connected with each other, source areas of the first transistor and the second transistor are both connected with the power source line, a drain area of the second transistor is connected with a pixel electrode of the OLED, and the first and second transistors are operated in a saturated area, and luminance of the OLED is controlled by controlling a size of the drain current of the first transistor by a video signal. - View Dependent Claims (23, 24, 26, 27, 29, 30, 62, 63, 64, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148)
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25. A light emitting device comprising:
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a first transistor;
a second transistor;
a third transistor;
a fourth transistor;
an OLED;
a power source line;
a signal line; and
a scanning line, wherein gate electrodes of the third transistor and the fourth transistor are connected with the scanning line, one of source area and drain area of the third transistor is connected with the signal line, and the other one is connected with a gate electrode of the first transistor, one of source area and drain area of the fourth transistor is connected with a gate electrode of the first transistor, and the other one is connected with a drain area of the first transistor, gate electrodes of the first transistor and the second transistor are connected with each other, source areas of the first transistor and the second transistor are both connected with the power source line, a drain area of the second transistor is connected with a pixel electrode of the OLED, and the first and second transistors are operated in a saturated area.
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28. A light emitting device comprising:
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a first transistor;
a second transistor;
a third transistor;
a fourth transistor;
an OLED;
a power source line;
a signal line; and
a scanning line, wherein gate electrodes of the third transistor and the fourth transistor are connected with the scanning line, one of source area and drain area of the third transistor is connected with the signal line, and the other one is connected with a gate electrode of the first transistor, one of the source area and the drain area of the fourth transistor is connected with a gate electrode of the first transistor, and the other one is connected with a drain area of the first transistor, the gate electrodes of the first transistor and the second transistor are connected with each other, source areas of the first transistor and the second transistor are both connected with the power source line, a drain area of the second transistor is connected with a pixel electrode of the OLED, the first and second transistors are operated in a saturated area, and luminance of the OLED is controlled by controlling a size of a drain current of the first transistor.
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31. A light emitting device comprising:
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a first transistor;
a second transistor;
a third transistor;
a fourth transistor;
an OLED;
a power source line;
a signal line; and
a scanning line, wherein gate electrodes of the third transistor and the fourth transistor are connected with the scanning line, one of the source area and the drain area of the third transistor is connected with the signal line, and the other one is connected with a gate electrode of the first transistor, one of source area and drain area of the fourth transistor is connected with a gate electrode of the first transistor, and the other one is connected with a drain area of the first transistor, gate electrodes of the first transistor and the second transistor are connected with each other, source areas of the first transistor and the second transistor are both connected with the power source line, a drain area of the second transistor is connected with a pixel electrode of the OLED, the first and second transistors are operated in a saturated area, and luminance of the OLED is controlled by controlling a size of a drain current of the first transistor by a video signal. - View Dependent Claims (32, 65, 149, 150, 151, 152, 153, 154, 155)
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34. A light emitting device comprising:
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a first transistor;
a second transistor;
a third transistor;
a fourth transistor;
an OLED;
a power source line;
a signal line; and
a scanning line, wherein gate electrodes of the third transistor and the fourth transistor are connected with the scanning line, one of source area and drain area of the third transistor is connected with the signal line, and the other one is connected with a drain area of the first transistor, one of source area and drain area of the fourth transistor is connected with the signal line, and the other one is connected with a gate electrode of the first transistor, the gate electrodes of the first transistor and the second transistor are connected with each other, source areas of the first transistor and the second transistor are both connected with the power source line, a drain area of the second transistor is connected with a pixel electrode of the OLED, the first and second transistors are operated in a saturated area, a period with the third and fourth transistors switched on and a period with the third and fourth transistors switched off are provided in one frame period, and luminance of the OLED is controlled by controlling a size of a current supplied to the signal line in the period with the third and fourth transistors switched on.
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37. A light emitting device comprising:
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a first transistor;
a second transistor;
a third transistor;
a fourth transistor;
an OLED;
a power source line;
a signal line; and
a scanning line, wherein gate electrodes of the third transistor and the fourth transistor are connected with the scanning line, one of source area and drain area of the third transistor is connected with the signal line, and the other one is connected with a drain area of the first transistor, one of source area and drain area of the fourth transistor is connected with a drain area of the first transistor, and the other one is connected with a gate electrode of the first transistor, the gate electrodes of the first transistor and the second transistor are connected with each other, source areas of the first transistor and the second transistor are both connected with the power source line, a drain area of the second transistor is connected with a pixel electrode of the OLED, the first and second transistors are operated in a saturated area, a period with the third and fourth transistors switched on and a period with the third and fourth transistors switched off are provided in one frame period, and luminance of the OLED is controlled by controlling a size of a current supplied to the signal line in the period with the third and fourth transistors switched on.
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40. A light emitting device comprising:
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a first transistor;
a second transistor;
a third transistor;
a fourth transistor;
an OLED;
a power source line;
a signal line; and
a scanning line, wherein gate electrodes of the third transistor and the fourth transistor are connected with the scanning line, one of source area and drain area of the third transistor is connected with the signal line, and the other one is connected with a gate electrode of the first transistor, one of source area and drain area of the fourth transistor is connected with a gate electrode of the first transistor, and the other one is connected with a drain area of the first transistor, the gate electrodes of the first transistor and the second transistor are connected with each other, source areas of the first transistor and the second transistor are both connected with the power source line, a drain area of the second transistor is connected with a pixel electrode of the OLED, the first and second transistors are operated in a saturated area, a period with the third and fourth transistors switched on and a period with the third and fourth transistors switched off are provided in one frame period, and luminance of the OLED is controlled by controlling a size of a current supplied to the signal line in the period with the third and fourth transistors switched on. - View Dependent Claims (41, 42, 68, 170, 171, 172, 173, 174, 175, 176)
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43. A light emitting device comprising:
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a first transistor;
a second transistor;
a third transistor;
a fourth transistor;
a fifth transistor;
an OLED;
a power source line;
a signal line;
a first scanning line; and
a second scanning line, wherein gate electrodes of the third transistor and the fourth transistor are connected with the first scanning line, one of a source area and a drain area of the third transistor is connected with the signal line, and the other one is connected with a drain area of the first transistor, one of a source area and a drain area of the fourth transistor is connected with the signal line, and the other one is connected with a gate electrode of the first transistor, the gate electrodes of the first transistor and the second transistor are connected with each other, source areas of the first transistor and the second transistor are both connected with the power source line, a drain area of the second transistor is connected with a pixel electrode of the OLED, a gate electrode of the fifth transistor is connected with the second scanning line, one of a source area and a drain area of the fifth transistor is connected with the power source line, and the other one is connected with the gate electrode of the first transistor. and the first and second transistors are operated in a saturated area. - View Dependent Claims (44, 45, 47, 48, 50, 51, 69, 70, 71, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197)
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46. A light emitting device comprising:
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a first transistor;
a second transistor;
a third transistor;
a fourth transistor;
a fifth transistor;
an OLED;
a power source line;
a signal line;
a first scanning line, and a second scanning line, wherein gate electrodes of the third transistor and the fourth transistor are connected with the first scanning line, one of a source area and a drain area of the third transistor is connected with the signal line, and the other one is connected with a drain area of the first transistor, one of a source area and a drain area of the fourth transistor is connected with the signal line, and the other one is connected with a gate electrode of the first transistor, the gate electrodes of the first transistor and the second transistor are connected with each other, source areas of the first transistor and the second transistor are both connected with the power source line, a drain area of the second transistor is connected with a pixel electrode of the OLED, a gate electrode of the fifth transistor is connected with the second scanning line, one of a source area and a drain area of the fifth transistor is connected with the power source line, and the other one is connected with a gate electrode of the first transistor, the first and second transistors are operated in a saturated area, and luminance of the OLED is controlled by controlling a size of a drain current of the first transistor.
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49. A light emitting device comprising:
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a first transistor;
a second transistor;
a third transistor;
a fourth transistor;
a fifth transistor;
an OLED;
a power source line;
a signal line;
a first scanning line; and
a second scanning line, wherein gate electrodes of the third transistor and the fourth transistor are connected with the first scanning line, one of a source area and a drain area of the third transistor is connected with the signal line, and the other one is connected with a drain area of the first transistor, one of a source area and a drain area of the fourth transistor is connected with the signal line, and the other one is connected with a gate electrode of the first transistor, the gate electrodes of the first transistor and the second transistor are connected with each other, source areas of the first transistor and the second transistor are both connected with the power source line, a drain area of the second transistor is connected with a pixel electrode of the OLED, a gate electrode of the fifth transistor is connected with the second scanning line, one of a source area and a drain area of the fifth transistor is connected with the power source line, and the other one is connected with a gate electrode of the first transistor, the first and second transistors are operated in a saturated area, and luminance of the OLED is controlled by controlling a size of a drain current of the first transistor by a video signal.
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52. A light emitting device comprising:
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a plurality of thin film transistors;
a plurality of cathodes each of which is electrically connected with corresponding one of said thin film transistors;
a bank provided between two of said cathodes which are adjacent to each other;
a metal film provided over said bank;
an organic light emitting layer provided over each of said cathodes; and
an anode covering said organic light emitting layer and said bank and said metal film, wherein said bank and said metal film overlaps with corresponding one of said thin film transistors.
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53. A light emitting device comprising:
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a plurality of thin film transistors;
a plurality of cathodes each of which is electrically connected with corresponding one of said thin film transistors;
a bank provided between two of said cathodes which are adjacent to each other;
a metal film provided over said bank;
an organic light emitting layer provided over each of said cathodes; and
a transparent conductive film covering said organic light emitting layer and said bank and said metal film, wherein said bank and said metal film overlaps with corresponding one of said thin film transistors, and wherein said transparent conductive film is formed by ion plating method.
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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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InventorsKoyama, Jun
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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 Current315/169.1
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CPC Class CodesC09K 11/06 containing organic luminesc...C09K 2211/1088 containing oxygen as the on...C09K 2211/185 of the platinum group, i.e....G09G 2300/0417 Special arrangements specif...G09G 2300/0426 Layout of electrodes and co...G09G 2300/0809 Several active elements per...G09G 2300/0842 forming a memory circuit, e...G09G 2300/0861 with additional control of ...G09G 2310/027 Details of drivers for data...G09G 2310/0272 Details of drivers for data...G09G 2320/0247 Flicker reduction other tha...G09G 2320/0266 Reduction of sub-frame arte...G09G 2320/041 Temperature compensationG09G 3/2022 using sub-framesG09G 3/3208 organic, e.g. using organic...G09G 3/3241 the current through the lig...G09G 3/3266 Details of drivers for scan...G09G 3/3283 in which the data driver su...H01L 27/1222 with a particular compositi...H01L 27/1285 using control of the anneal...View All
