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AssigneesHitachi, Ltd., Hitachi Device Engineering Co., Ltd.
InventorsToshio Miyazawa, Hideo Satou, Tomohiko Satou, Masahiro Maki
Estimating the term…
A display device has a driver including a level converter formed of polysilicon MISTFTs. The level converter includes first, second and third N-channel MISTFTs (NMISTFTs) and first, second and third P-channel MISTFTs (PMISTFTs). Gate and first terminals of the first NMISTFT and PMISTFT, and a gate terminal of the third PMISTFT are coupled to an input terminal via a capacitance. Second terminals of the second NMISTFT and PMISTFT, and a gate terminal of third NMISTFT are coupled to the input terminal via a capacitance. A first terminal of the third PMISTFT, and second terminals of the first NMISTFT and PMISTFT are coupled to a high voltage. A second terminal of the third NMISTFT, gate and first terminals of the second NMISTFT and PMISTFT are coupled to a low voltage. A second terminal of the third PMISTFT and a first terminal of the third NMISTFT are connected to an output terminal.
A display device including a pair of substrates, an electrooptical material layer sandwiched between said pair of substrates, a plurality of pixels formed between said pair of substrates and a driver circuit for driving said plurality of pixels provided on one of said pair of substrates, said driver circuit including a level converter circuit comprised of MISTFTs (Metal Insulator Semiconductor Thin Film Transistors) having semiconductor layers made of polysilicon,
A display device including a pair of substrates, an electrooptical material layer sandwiched between said pair of substrates, a plurality of pixels formed between said pair of substrates and a driver circuit for driving said plurality of pixels provided on one of said pair of substrates, said driver circuit including a level converter circuit comprised of MISTFTs (Metal Insulator Semiconductor Thin Film Transistors) having semiconductor layers made of polysilicon, said level converter circuit having a plurality of stages arranged in series,
A display device including a pair of substrates, an electrooptical material layer sandwiched between said pair of substrates, a plurality of pixels formed between said pair of substrates and a driver circuit for driving said plurality of pixels provided on one of said pair of substrates, said driver circuit including a level converter circuit comprised of MISTFTs (Metal Insulator Semiconductor Thin Film Transistors) of a same conductivity type and having semiconductor layers made of polysilicon,
A display device including a pair of substrates, an electrooptical material layer sandwiched between said pair of substrates, a plurality of pixels formed between said pair of substrates and a driver circuit for driving said plurality of pixels provided on one of said pair of substrates, said driver circuit including a level converter circuit comprised of MISTFTs (Metal Insulator Semiconductor Thin Film Transistors) of a same conductivity type and having semiconductor layers made of polysilicon,
A display device including a pair of substrates, an electrooptical material layer sandwiched between said pair of substrates, a plurality of pixels formed between said pair of substrates and a driver circuit for driving said plurality of pixels provided on one of said pair of substrates, said driver circuit including a level converter circuit comprised of MISTFTs (Metal Insulator Semiconductor Thin Film Transistors) of a same conductivity type and having semiconductor layers made of polysilicon,
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Manipulating of pulses not covered by one of the other main groups of this subclass: changing the DC level
Control of matrices with row and column drivers: using an active matrix
Arrangements for reducing power consumption: in field effect transistor circuits
Coupling arrangements; Impedance matching circuits: of complementary type, e.g. CMOS
Term ended 10 Jun 2022 (estimated)
The present invention relates to a display device, and in particular to an active matrix type display device having a driver circuit for driving pixels, fabricated on its substrate of its display panel.
A display panel has an electrooptical material layer sandwiched between a pair of substrates. In this specification, the term “electrooptical material” refers to material which changes its optical properties such as transmission, emission, refractive index and absorption of light under the influence of an electric field or current. The electrooptical material includes liquid crystal material and electroluminescent material, for example.
By way of example, an active matrix type liquid crystal display device shall be considered.
In the accompanying drawings, in which like reference numerals designate similar components throughout the figures, and in which:
FIG. 1A is a circuit diagram of an embodiment of a voltage level converter fabricated in the liquid crystal display device in accordance with the present invention, and FIG. 1B illustrates waveforms of an input pulse and signals at three nodes in the voltage level converter of FIG. 1A;
FIG. 2 is an equivalent circuit diagram of an overall configuration of an embodiment of the liquid crystal display device in accordance with the present invention;
The embodiments of the display device in accordance with the present invention will be explained in detail by reference to the drawings.
For the sake of being specific, we shall assume throughout this specification that a liquid crystal material layer is used as an electrooptical material layer in the display device. It is needless to say that an electrooptical material layer other than the liquid crystal material layer, an electroluminescent material layer, for example, can be used instead in the following embodiments.
Embodiment 1