Holding field to improve the image retention of a cholesteric nematic phase transition liquid crystal imaging system专利检索-脉冲电场电场物理专利检索查询-专利查询网

Holding field to improve the image retention of a cholesteric nematic phase transition liquid crystal imaging system

阅读：741发布：2023-07-17

专利汇可以提供Holding field to improve the image retention of a cholesteric nematic phase transition liquid crystal imaging system专利检索，专利查询，专利分析的服务。并且An imaging system including an imaging layer comprising cholesteric liquid crystalline material in an electrical field capable of having field strengths in the cholesteric nematic phase transition field strength range or the Grandjean to focalconic texture transformation field strength range of the liquid crystalline imaging material. The imaging material is typically imaged by placing an imagewise phase-transition or texturetransformation inducing electrical field across a layer of imaging material. The present invention controls such an imaging system by maintaining a substantially uniform holding field across the entire surface of the imaging material, said holding field typically being maintained across the imaging material after it has been imaged. The holding field may be applied in the form of various phenomena. The particular type of holding field applied has field strengths below the cholesteric-nematic phase transition or the Grandjean to focal-conic texture transformation field strength thresholds of the imaging material. The imaging system, and especially its image memory and image relaxation characteristics are controlled by varying the strength of the holding field, and by applying field pulses in imagewise configuration to image the liquid crystalline imaging material, or by pulsing the field uniformly across the entire surface of the imaging material to field strengths above the phasetransition threshold or the texture transformation threshold, thereby enhancing the image already formed in the imaging material.，下面是Holding field to improve the image retention of a cholesteric nematic phase transition liquid crystal imaging system专利的具体信息内容。

权利要求

2. The method of claim 1 wherein said holding field comprises an electric field.

3. The method of claim 2 wherein the imaged layer of imaging composition is provided by providing a layer of imaging composition comprising cholesteric liquid crystalline material in the cholesteric-nematic phase transition temperature range of said composition, and applying an imagewise electrical field across said composition, said imagewise field of a field strength within the cholesteric-nematic nematic phase transition electrical field strength range of said composition.

4. The method of claim 3 wherein said electrical holding field is maintained across the entire surface area of said layer throughout the relaxation of the imaged areas from the imaged nematic state back into the cholesteric state, whereby the relaxation response of the composition is controlled.

5. The method of claim 3 wherein the imaging composition comprises a mixture of cholesteric and nematic liquid crystalline materials.

6. The method of claim 3 wherein the imaging composition comprises a mixture of cholesteric and smectic liquid crystalline materials.

7. The method of claim 3 wherein the layer of imaging composition is of a thickness not greater than about 10 mils.

8. The method of claim 7 wherein the layer of imaging composition is of a thickness in the range between about 1/4 mil and about 5 mils.

9. The method of claim 3 wherein the layer of imaging composition is viewed with means for enhancing contrast between the image and background areas.

10. The method of claim 9 wherein the imaging composition is viewed between polarizers.

11. An imaging method comprising the method of claim 3 and thereafter re-imaging the layer of imaging composition by applying an imagewise electrical field across said composition, said imagewise field of a field strength within the cholesteric-nemaTic phase transition electrical field strength range of said composition.

12. A method of renewing an image comprising the method of claim 3 and thereafter applying an electrical field across the entire surface area of said layer of imaging composition, said field having a field strength within the cholesteric-nematic phase transition electrical field strength range of said composition, and maintaining this field across the entire surface area of said layer for a length of time wherein the previously imagewise cholesteric-nematic phase transformed areas have the phase transformation renewed therein, but the background areas remain substantially in the cholesteric liquid crystalline state.

13. An imaging method comprising a. the method of claim 3 wherein said electrical holding field is maintained across the entire surface area of said layer until previously imaged areas of said layer are about at the point of maximum transmissivity in the nematic-cholesteric relaxation, and b. said layer is then re-imaged by reapplying the same imagewise electrical field across said composition, said imagewise field of a field strength within the cholesteric-nematic phase transition electrical field strength range of said composition.

14. An imaging method comprising a. the method of claim 3 wherein said electrical holding field is maintained across the entire surface area of said layer until previously imaged areas of said layer are at about the point of maximum transmissivity in the nematic-cholesteric relaxation, and b. said layer is then re-imaged by applying an electrical field across the entire surface area of said layer of imaging composition, said field having a field strength within the cholesteric-nematic phase transition electrical field strength range of said composition, and maintaining this field across the entire surface area of said layer for a length of time wherein the previously imagewise cholesteric-nematic phase transformed areas have the phase transformation renewed therein, but the background areas remain substantially in the cholesteric liquid crystalline state.

15. An imaging method comprising cyclicly repeating steps (a) and (b) of claim 14 a plurality of times whereby an image is maintained in the layer of imaging composition.

16. An imaging method comprising providing an imaging member comprising a layer of imaging composition comprising cholesteric liquid crystalline material, said layer between a pair of electrodes, at least one of which is substantially transparent and at least one of which is shaped in a desired image configuration, and means for applying an electrical field between said electrodes across the layer of imaging composition, and performing the method of claim 3 upon said imaging composition.

17. The method of claim 16 wherein both electrodes are shaped in a desired image configuration.

18. The method of claim 17 wherein the electrodes comprise a pair of sets of parallel strip electrodes, and said pair of parallel strip electrodes are oriented crossing each other in an X-Y grid pattern.

19. The method of claim 16 wherein both electrodes are substantially transparent.

20. The method of claim 16 wherein the layer of imaging composition is of a thickness not greater than about 10 mils.

21. The method of claim 16 wherein the imaging member is viewed with means for enhancing contrast between the image and background areas.

22. The method of claim 21 wherein the imaging member is viewed between polarizers.

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Holding field to improve the image retention of a cholesteric nematic phase transition liquid crystal imaging system

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