1990-01-08
1991-05-14
Miller, Stanley D.
350334, 350335, G02F 113
Patent
active
050150740
DESCRIPTION:
DESCRIPTION
FIGS 3a and 3b diagrammatically and respectively show in exploded sectional form an example of a display cell according to the invention. The latter has three insulating walls 31, 33, 35. Between the facing faces and around the walls 31, 33 is placed a sealing joint 37, whilst between the facing faces and around walls 33 and 35 is placed a sealing joint 39.
Within the space created by joint 37 and walls 31, 33 is placed a wall member 41 for subdividing said space into two separate zones 41a, 41b, each of the said zones being shaped like a complimentary comb. Thus, the regions 40A corresponding to the teeth of the comb formed by zone 41A alternate with the regions 40B corresponding to the teeth of the comb constituted by zone 41B. The width of regions 40A exceeds that of regions 40B and is e.g. double the width of said regions 40B. Moreover, within the space created by joint 39 and walls 33, 35 is arranged a wall member 43 for subdividing said space into two separate zones 43B, 43C, each of which is shaped like a complementary comb. Thus, the regions 42B corresponding to the teeth of the comb constituted by zone 43B alternate with regions 42C corresponding to the teeth of the comb constituted by zone 43C. The width of regions 42C exceeds that or regions 42B and is e.g. twice the width of said regions 42B.
The wall members 41 and 43 are respectively placed between walls 31, 33 and walls 33, 35, in such a way that each region 40B is superimposed on part of a region 42C and each region 40A is superimposed on the other part of a region 42C and a region 42B.
The different zones 41A, 41B, 43B, 43C are respectively filled with dichroic display materials, e.g. via filling holes 45 e.g. made in the facing walls 31, 35 of said zones. Each of these display materials is constituted by a liquid crystal, e.g. of the nematic or ferroelectric type, and a dye.
Thus, for example, zone 40A contains a display material A, whose dye is chosen in such a way that in the absorbent state the transmission curve T of said material is close to curve T(A) shown in FIG. 3C, or in other words is equal to 1 for radiation of wavelength below 0.5 .mu.m and more particularly for radiation of wavelength between 0.4 and 0.5 .mu.m and is equal to 0 for other radiation levels. Zones 40B and 42B contain a display material B, whose dye is chosen in such a way that in the absorbent state the transmission curve of said material is close to curve T(B) shown in FIG. 3c, or in other words 1 for radiation of wavelength above 0.6 .mu.m and more particularly for radiation of wavelength between 0.6 and 0.7 .mu.m and is zero for other radiation levels. Zone 42C contains a display material C, whose dye is chosen in such a way that in the absorbent state the transmission curve of said material is close to curve T(C) shown in FIG. 3c, or in other words is equal to 1 for radiation of wavelength between 0.5 and 0.6 .mu.m and is zero for the other radiation levels. The wavelengths between 0.4 and 0.5 .mu.m in the visible spectrum correspond to blue, those between 0.5 and 0.6 .mu.m; correspond to green and those between 0.6 and 0.7 .mu.m correspond to red. The relative values 1 to 0 of the transmission curves respectively correspond to transmissions and absorptions.
Thus, in the absorbent state, material A absorbs radiation corresponding to green and read and transmits that corresponding to blue, material B absorbs radiation corresponding to blue and green and transmits that corresponding to red and material C absorbs radiation corresponding to blue and red and transmits that corresponding to green.
Thus, for example, the dye contained in material A can be a blue dye F.sub.1 marketed by Merck, the dye contained in material B can be a red dye F.sub.263 or a mixture of yellow F.sub.3 and red F.sub.2 dyes marketed by Merck and the dye contained in material C can be a mixture of yellow F.sub.3 and green F.sub.235 dyes marketed by Merck.
In addition, FIG. 3a shows in exemplified manner a multiplexed display. Therefore the excitation of the display materials is obtained b
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Clerc Jean-Frederic
Dijon Jean
Ebel Christine
Commissariat a l''Energie Atomique
Miller Stanley D.
Trice Ron
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