Active matrix display device
First Claim
Patent Images
1. A display device being provided with a display driving circuit including a ratioless dynamic shift register which includes multi-staged inverters on a substrate surface, wherein:
- the ratioless dynamic shift register is comprised of MISTFTs which use polycrystalline silicon as a semiconductor layer, separate MISTFTs are connected in parallel to MISTFTs which are connected to ground levels of outputs of respective stages of the multi-staged inverters, and the separate MISTFTs are comprised such that each output is dropped to a ground level during a period other than a period in which a signal of High level is transmitted in response to an input signal of an inverter coupled to an input of a stage which is comprised of a MISTFT.
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Abstract
A display device includes a dynamic ratioless shift register which is operated in a stable manner and can expand the degree of freedom of design. In the dynamic ratioless shift register which is provided with thin film transistors having semiconductor layers made of p-Si on a substrate surface, a node which becomes the floating state is connected to a fixed potential through a capacitance element.
20 Citations
8 Claims
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1. A display device being provided with a display driving circuit including a ratioless dynamic shift register which includes multi-staged inverters on a substrate surface, wherein:
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the ratioless dynamic shift register is comprised of MISTFTs which use polycrystalline silicon as a semiconductor layer, separate MISTFTs are connected in parallel to MISTFTs which are connected to ground levels of outputs of respective stages of the multi-staged inverters, and the separate MISTFTs are comprised such that each output is dropped to a ground level during a period other than a period in which a signal of High level is transmitted in response to an input signal of an inverter coupled to an input of a stage which is comprised of a MISTFT. - View Dependent Claims (2, 3)
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4. A display device being characterized in that the display device is provided with a display driving circuit including a ratioless dynamic shift register which is comprised of multi-staged inverters on a substrate surface, wherein:
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the ratioless dynamic shift register is comprised of first to third MISTFTs which use polycrystalline silicon as a semiconductor layer, wherein each of the first to third MISTFTs includes a first terminal and a second terminal, and further wherein;
the first MISTFT and the second MISTFT which are connected in parallel to each other are provided as MISTFTs which are connected to ground levels of respective outputs of respective stages of said multi-stage inverters, either one of the first MISTFT and the second MISTFT is comprised such that each output is dropped to a ground level during a period other than a period in which a signal of High level is transmitted in response to an input signal of an inverter in a stage preceding to a stage which is comprised of an MISTFT, and a diode which comprises the third MISTFT is provided between a gate of either one of the first MISTFT and the second MISTFT and a node to which a clock is supplied through a diode such that a charge which is charged to the gate is prevented from leakage thereof which is caused by lowering of a potential of a node below a ground level to a node as an inverse current flow of the diode.
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5. A display device being characterized in that the display device is provided with a display driving circuit including a ratioless dynamic shift register which is comprised of multi-staged inverters on a substrate surface, wherein:
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the ratioless dynamic shift register is comprised of first to fourth MISTFTs which use polycrystalline silicon as a semiconductor layer, and the first MISTFT and the second MISTFT which drop respective outputs of respective stages to a ground level when a first clock and a second clock are in an “
ON”
state and the third MISTFT and the fourth MISTFT which become an “
ON”
state when outputs are at a “
High”
level and turn off the first MISTFT and the second MISTFT are provided. - View Dependent Claims (6, 8)
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7. A display device being characterized in that the display device is provided with a display driving circuit including a ratioless dynamic shift register which is comprised of multi-staged inverters on a substrate surface, wherein:
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the ratioless dynamic shift register is comprised of MISTFTs which use polycrystalline silicon as a semiconductor layer, a first MISTFT is provided which is connected to ground levels of respective outputs of respective stages of said multi-staged inverters, a second MISTFT is provided which is operated with an output of a preceding stage and has one end thereof connected to a ground level and another end thereof connected to a clock through a first capacitance element and further has said another end thereof connected to a gate of the first MISTFT, and a second capacitance element is disposed between said another end of the second MISTFT and the ground level.
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Specification