Semiconductor circuits for driving current-driven display and display
First Claim
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1. An active matrix type display device comprising:
- a display including a matrix of pixels, each of the pixels having an organic luminous element and a driving transistor;
a driver circuit including a current output unit configured to output a current to be applied to each of the pixels; and
a reference current generation circuit configured to generate a reference current, whereinthe current output unit has transistor groups as output stages thereof, each of the transistor groups having one transistor or a plurality of transistors, so that the outputted current is applied to the driving transistor, andthe current outputted from at least one transistor of the transistor groups is changeable according to a magnitude of the generated reference current.
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Abstract
In a semiconductor circuit of a current output type, when display is performed by plural semiconductor circuit in one display panel, luminance unevenness for each block with a different semiconductor circuit occurs due to fluctuation in the semiconductor circuits.
In current output stages 14a and 14b, current mirror circuits are constituted at both ends of a chip, and a reference current to be a reference of gradation display is supplied from both the ends. Moreover, by increasing a resistance value of a gate line of the current mirror circuit of distributing a current to each output, deviation of a transistor threshold value in the chip was compensated for, and output currents at left and right ends were matched. Moreover, reference currents were made the same by connecting resistors for reference current generation 11c to 11f each other at least between semiconductor circuits connected side by side, and fluctuation of current values across all semiconductor circuits decreased to 1% or less, whereby unevenness which occurred in boundaries of chips could be eliminated.
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Citations
18 Claims
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1. An active matrix type display device comprising:
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a display including a matrix of pixels, each of the pixels having an organic luminous element and a driving transistor; a driver circuit including a current output unit configured to output a current to be applied to each of the pixels; and a reference current generation circuit configured to generate a reference current, wherein the current output unit has transistor groups as output stages thereof, each of the transistor groups having one transistor or a plurality of transistors, so that the outputted current is applied to the driving transistor, and the current outputted from at least one transistor of the transistor groups is changeable according to a magnitude of the generated reference current. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An active matrix type display device comprising:
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a display including a matrix of pixels, each of the pixels having an organic luminous element and a driving transistor; a driver circuit including a current output unit configured to output a current to be applied to each of the pixels; a reference current generation circuit configured to generate a reference current; a first coupling circuit; and a seconu coupling circuit, wherein the current output unit has transistor groups as output stages thereof, each of the transistor groups having one transistor or a plurality of transistors, so that the outputted current is applied to the driving transistor, and the first coupling circuit and the second coupling circuit are electrically coupled to a gate line of at least one transistor of the transistor groups, and are supplied the generated reference current. - View Dependent Claims (8, 9, 10, 11)
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12. An active matrix type display device comprising:
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a display including a matrix of pixels, each of the pixels having an organic luminous element and a driving transistor; a driver circuit including a voltage output unit configured to output a voltage to be applied to each of the pixels and a current output unit configured to output a current to be applied to each of the pixels; a judgment circuit configured to judge whether the voltage output unit outputs the voltage or the current output unit outputs the current, wherein the current output unit having has transistor groups as output stages thereof, each of the transistor groups having one transistor or a plurality of transistors, so that the outputted current is applied to the driving transistor. - View Dependent Claims (13, 14, 15, 16)
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17. A display device comprising:
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a display including a matrix of pixels, each of the pixels having an organic luminous element; a driver circuit including a current output unit configured to output a current to be applied to each of the pixels; and a reference current generation circuit configured to generate a reference current, wherein the current output unit has transistor groups as output stages thereof, each of the transistor groups having one transistor or a plurality of transistors, the current outputted from at least one transistor of the transistor groups is changeable according to a magnitude of the generated reference current, and a total resistance value of the gate line of the transistor groups is set to a value equal to or larger than a larger one of a value, which is found by dividing a voltage of a difference between a maximum value and a minimum value of a gate voltage with respect to a reference current value in a use process by a value of 0.5% of the reference current, and 1 KΩ
, and equal to or smaller than 5 MΩ
.
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18. A display device comprising:
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a display including a matrix of pixels, each of the pixels having an organic luminous element; a driver circuit including a voltage output unit configured to output a voltage to be applied to each of the pixels and a current output unit configured to output a current to be applied to each of the pixels; a judgment circuit configured to judge whether the voltage output unit outputs the voltage or the current unit outputs the current, wherein the current output unit has transistor groups as output stages thereof, each of the transistor groups having one transistor or a plurality of transistors, and a total resistance value of the gate line of the transistor groups is set to a value equal to or larger than a larger one of a value, which is found by dividing a voltage of a difference between a maximum value and a minimum value of a gate voltage with respect to a reference current value in a use process by a value of 0.5% of the reference current, and 1 KΩ
, and equal to or smaller than 5 MΩ
.
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Specification
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Current AssigneeJapan Display Central Incorporated (Japan Display Incorporated)
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Original AssigneeToshiba Matsushita Display Technology Co Ltd (Japan Display Incorporated)
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InventorsTsuge, Hitoshi
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Primary Examiner(s)Hjerpe; Richard
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Assistant Examiner(s)Sheng; Tom V
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Application NumberUS11/669,333Publication NumberTime in Patent Office1,357 DaysField of Search345/76, 345/77, 345/211, 345/214, 345/690, 315/169.3US Class Current345/211CPC Class CodesG09G 3/30 using electroluminescent pa...H03M 1/06 Continuously compensating f...
