1. An alignment control film, adapted to be an alignment control film of a liquid crystal display to drive a liquid crystal with an electric field arising between a pair of electrodes formed on a substrate, comprising a polyamic acid or polyimide that includes cyclobutanetetracarboxylic acid dianhydride andor its derivative and aromatic diamine; and
wherein the cyclobutanetetracarboxylic acid dianhydride andor its derivative is a compound represented by a formula 1:
where R1, R2, R3 and R4 of the compound of the formula 1 each independently represent a hydrogen atom, a fluorine atom, an alkyl group or alkoxyl group with a carbon number of 1 to 6, with the proviso that at least one of R1, R2, R3 and R4 of the compound of formula 1 is not hydrogen,
wherein the alignment control film has a thickness of from 1 nm to 100 nm, and
wherein the aromatic diamine compound contains at least one of compounds selected from a group of compounds consisting of ones represented by formulas 2 to 16:
where R1, R2, R3 and R4 of the compounds represented by formulas 2 to 16 each independently represent a hydrogen atom, a fluorine atom, an alkyl group or alkoxyl group with a carbon number of 1 to 6, or vinyl group {\u2014(CH2)m\u2014CH\u2550CH2,m=0, 1, 2} or a group represented by {\u2014(CH2)n\u2014C\u2261CH,n=0,1,2}, and in the formula 5, X represents a bond group \u2014S\u2014, \u2014CO\u2014, or \u2014NH\u2014.
2. The alignment control film according to claim 1, wherein said alignment control film is polyamic acid or polyimide containing at least 50% of a repeated structure of polyamic acid or polyimide comprising said cyclobutanetetracarboxylic acid dianhydride andor its derivative and said aromatic diamine.
3. The alignment control film according to claim 1, having a glass transition temperature equal to or higher than 250\xb0 C.
4. The alignment control film according to claim 1, wherein said polyamic acid or polyimide is a photoreactive polyamic acid or polyimide.
5. The alignment control film according to claim 1, wherein said thickness is 1 to 30 nm.
6. The alignment control film according to claim 1, said film having been subjected to alignment processing by irradiating the film with polarized light having a wavelength in a range of 200 to 400 nm.
7. The alignment control film according to claim 1, adapted to be an alignment control film of a liquid crystal display having an electric field parallel to said substrate.
8. A method for using an alignment control film, adapted to be an alignment control film of a liquid crystal display to drive a liquid crystal with an electric field arising between a pair of electrodes formed on one substrate of a pair of substrates, the alignment control film comprising a polyamic acid or polyimide that includes cyclobutanetetracarboxylic acid dianhydride andor its derivative and aromatic diamine, the method for using an alignment control film comprising:
providing the alignment control film on at least one of the pair of substrates;
wherein the cyclobutanetetracarboxylic acid dianhydride andor its derivative is a compound represented by a formula 1:
where R1, R2, R3 and R4 of the compound of the formula 1 each independently represent a hydrogen atom, a fluorine atom, an alkyl group or alkoxyl group with a carbon number of 1 to 6, with the proviso that at least one of R1, R2, R3 and R4 of the compound of formula 1 is not hydrogen,
wherein the alignment control film has a thickness of from 1 nm to 100 nm, and
wherein the aromatic diamine compound contains at least one of compounds selected from a group of compounds consisting of ones represented by formulas 2 to 16:
where R1, R2, R3 and R4 of the compounds represented by formulas 2 to 16 each independently represent a hydrogen atom, a fluorine atom, an alkyl group or alkoxyl group with a carbon number of 1 to 6, or vinyl group {\u2014(CH2)m\u2014CH\u2550CH2,m=0, 1, 2} or a group represented by {\u2014(CH2)n\u2014C\u2261CH,n=0, 1, 2}, and in the formula 5, X represents a bond group \u2014S\u2014, \u2014CO\u2014, or \u2014NH\u2014.
9. The method for using an alignment control film according to claim 8, wherein said alignment control film is polyamic acid or polyimide containing at least 50% of a repeated structure of polyamic acid or polyimide comprising said cyclobutanetetracarboxylic acid dianhydride andor its derivative and said aromatic diamine.
10. The method for using an alignment control film according to claim 8, having a glass transition temperature equal to or higher than 250\xb0 C.
11. The method for using an alignment control film according to claim 8, wherein said polyamic acid or polyimide is a photoreactive polyamic acid or polyimide.
12. The method for using an alignment control film according to claim 8, wherein said thickness is 1 to 30 nm.
13. The method for using an alignment control film according to claim 8, said film having been subjected to alignment processing by irradiating the film with polarized light having a wavelength in a range of 200 to 400 nm.
14. The method for using an alignment control film according to claim 8, adapted to be an alignment control film of a liquid crystal display having an electric field parallel to said substrate.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
We claim:
1. An integrated circuit, comprising:
an input circuit for receiving a signal, said input circuit having an activation input for receiving an activation signal to activate said input circuit, in a manner dependent on the activation signal, for receiving signals.
2. The integrated circuit according to claim 1, wherein said input circuit may be switched on or off with an aid of the activation signal.
3. The integrated circuit according to claim 1, further comprising a bidirectional inputoutput circuit and said input circuit is contained in said bidirectional inputoutput circuit.
4. The integrated circuit according to claim 1,
wherein said input circuit has a data input for a memory circuit; and
further comprising a control circuit for generating the activation signal, said control circuit generating the activation signal when data are to be written to the memory circuit through said input circuit.
5. The integrated circuit according to claim 4, wherein said control circuit generates the activation signal in a manner dependent on at least one of the following signals:
a circuit select signal;
a word line activation signal;
a bit line activation signal; and
a write signal.
6. The integrated circuit according to claim 1, wherein the integrated circuit is an integrated memory circuit.
7. A method for activating an input circuit for an integrated memory circuit, which comprises the step of:
activating the input circuit if a write access has been made to the integrated memory circuit; and
deactivating the input circuit if the write access has not been made to the integrated memory circuit.