Light valve专利检索-寻址电极显示技术专利检索查询-专利查询网

Light valve

阅读：87发布：2023-08-29

专利汇可以提供Light valve专利检索，专利查询，专利分析的服务。并且A light valve of the present invention comprises an oblique cut single crystal plate of strontium barium niobate (SBN), which is placed in a plane vertical to a light transmission; a plurality of transparent strip electrodes which are placed, at right intersections with each other, on the front and back surfaces of the plate; means for generating an electric field within the single crystal, in parallel with a light transmission direction, in a given region of the plate to be addressed by selectively providing an electric potential to these electrodes; an SBN single crystal plate of the same thickness and orientation, which is juxtaposed with the single crystal plate so that the optical axes of them may be at right angles to each other; and polarizers which are each provided in positions before and behind these both single crystal plates so that light polarization plane thereof may be at right angles to each other. In the light valve of the present invention, the SBN single crystal plate is operated as a longitudinal operation mode electro-optic material, and the birefringence shows a non-linear change and a hysteresis loop by a change in an applied electric field. The residual birefringence is used as an optical read/write memory. Also, a threshold of abrupt non-linear change region of the birefringence hysteresis loop may be used advantageously for selecting a voltage applied to the electrode, whereby cross-talk in addressing is avoided.，下面是Light valve专利的具体信息内容。

权利要求

1. A light valve comprising: an oblique cut monocrystalline plate of (SrxBayM''1 x y) (NbzM''''1 z)2O6, where x+y < OR = 1, z < OR = 1, M'' is Pb, Ca, La or Bi, and M'''' is Ti or Zr, means for applying an electric Field to said monocrystalline plate in a longitudinal mode of operation for causing polarization switching in said monocrystalline plate, and a pair of polarizers positioned in front of and in rear of said monocrystalline plate, respectively, the light polarization planes of said polarizers being in a direction vertical to each other.

2. A light valve in accordance with claim 1, in which said monocrystalline plate shows a change in birefringence along a hysteresis loop with respect to a change in said electrical field applied to said monocrystalline plate.

3. A light valve in accordance with claim 1, in which said monocrystalline plate shows a residual birefringence with respect to a change in said electrical field applied to said monocrystalline plate.

4. A light valve in accordance with claim 1, in which said monocrystalline plate shows a non-linear change in birefringence in a specified range of the electrical field applied to said monocrystalline plate.

5. A light valve in accordance with claim 1, in which the value of x and y is chosen in the following range; 0.34 < x < or = 0.75 0.25 < or = x < 0.66

6. A light valve in accordance with claim 1, in which the value of x has been chosen to be approximately 0.75 to 0.65.

7. A light valve in accordance with claim 1, in which the value of x and y has been chosen to be x + y 1.

8. A light valve in accordance with claim 1, in which the value of z has been chosen to be unity.

9. A light valve in accordance with claim 1, in which said monocrystalline plate has been cut at the angles of about 30* to 80* with respect to the optical axis thereof.

10. A light valve in accordance with claim 1, in which said means for electrical field comprises a plurality of strip electrodes formed on one surface of said monocrystalline plate extending in a row direction, and a plurality of strip electrodes formed on the other surface of said monocrystalline plate extending in a column direction.

11. A light valve in accordance with claim 10, which further comprises a row addressing means for selectively applying a potential to said row electrodes and a column addressing means for selectively applying a potential to said column electrodes.

12. A light valve in accordance with claim 11, in which said monocrystalline plate shows a non-linear change in birefringence in a specified range of the electrical field applied to said monocrystalline plate, and the potential fed from said row and column addressing means and applied to said row and column electrodes, respectively, has been chosen to be of such a value that develops an electrical field of a value less than said specified non-linear range, in a polarity opposite to each other, respectively, thereby developing a total electrical field of a value larger than said specified non-linear range at a specified location in said monocrystalline plate addressed as an intersection of the selected row and column electrodes.

13. A light valve in accordance with claim 11, in which said monocrystalline plate shows a residual birefringence with respect to a change in said electrical field applied to said monocrystalline plate, and the potential fed from said row and column addressing means and applied to said row and column electrodes, respectively, has been chosen to be such a value that causes a residual birefringence at a specified location in said monocrystalline plate addressed as an intersection of the selected row and column electrodes.

14. A light valve in accordance with claim 13, which further comprises means for applying a potential to said row and column electrodes for developing an electrical field in said monocrystalline plate for erasing said residual birefringence in said specified location.

15. A light valve in accordance with claim 1, which further comprises light addressing means.

16. A light valve in accordance with claim 15, in which said electrical field applying means comprises a pair of electrodes formed on both surfaces of said monocrystalline plate, and said light addressing means comprises a photoconductor layer interposed between said electrode on the light incident surface and said monocrystalline plate, said photoconductor layer normally preventing polarization switching in said monocrystalline plate from being caused by said applied electric field, but a decreased value of resistance in a specified region of said photoconductor in response to an incident light beam causing the applied electric field to give rise to polarization switching in said monocrystalline plate, thereby achieving light addressing in said plate.

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