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    • 4. 发明授权
    • Display device and projection-type display apparatus using the device
    • 使用该装置的显示装置和投影型显示装置
    • US06177965B1
    • 2001-01-23
    • US08789492
    • 1997-01-27
    • Hiroshi TakaharaHideki Omae
    • Hiroshi TakaharaHideki Omae
    • G02F1335
    • H04N9/3129G02F1/1334G02F1/133526G02F1/134336G02F1/136213G02F2001/13756G02F2201/121G02F2201/122G09G3/001G09G3/002G09G3/3614G09G3/3648G09G3/3655G09G3/3659G09G2300/0876G09G2310/06G09G2320/0219H04N5/7441H04N9/3105H04N9/312
    • In a display device, counter electrodes are formed in stripes at a position facing pixel electrodes, with a polymer dispersion liquid crystal held between the counter electrodes and pixel electrodes. When a positive-polarity signal is to be impressed to a pixel electrode, a negative-polarity voltage is fed to the counter electrode. On the other hand, when a negative-polarity signal is to be impressed to a pixel electrode, a positive-polarity voltage is added to the counter electrode. In this manner of impression voltages, a high voltage can be applied to the polymer dispersion liquid crystal layer on the pixel electrodes, so that the liquid crystal layer is turned into the transmitting state even if it is thick. Accordingly, the scattering efficiency is improved and images are displayed with high contrast as the liquid crystal layer can be made thick. If the thick transparent substrate is bonded to the counter substrate having the counter electrodes thereon, the light scattered at the liquid crystal layer is reflected by the counter substrate and returned back to the liquid crystal layer, thus eliminating the light to be scattered again.
    • 在显示装置中,对置电极在面对像素电极的位置上以条状形成,聚合物分散液晶保持在对置电极和像素电极之间。 当正极性信号被施加到像素电极时,负极性电压被馈送到对电极。 另一方面,当向像素电极施加负极性信号时,向对极添加正极性电压。 以这种压印方式,可以对像素电极上的聚合物分散液晶层施加高电压,使得液晶层即使厚度也变成透射状态。 因此,随着可以使液晶层变厚,散射效率提高,并且以高对比度显示图像。 如果厚的透明基板与其上具有相对电极的对置基板接合,则在液晶层上散射的光被对置基板反射并返回到液晶层,从而消除再次散射的光。
    • 9. 发明授权
    • Polymer dispersed liquid crystal panel with diffraction grating
    • 具有衍射光栅的聚合物分散液晶面板
    • US5299289A
    • 1994-03-29
    • US896967
    • 1992-06-11
    • Hideki OmaeHirosi TakaharaTakaaki Tanaka
    • Hideki OmaeHirosi TakaharaTakaaki Tanaka
    • G02F1/1333G02F1/1334H04N9/31G02F1/137G02F1/13
    • G02F1/1334G02F1/133371H04N9/3105G02F2201/305G02F2203/22
    • A layer having an irregular sectional surface is formed on the surface of at least one of a pixel electrode and confronting electrode of a liquid crystal layer so as to confront a liquid crystal layer. The liquid crystal layer is formed of a polymer dispersed liquid crystal. If the layer having an irregular sectional surface is formed in a convex and concave pattern regularly and cyclically, the thus formed layer serves as a diffraction grating. When the liquid crystal is in an OFF condition, the refractive index n of the diffraction grating is different from the refractive index of the liquid crystal layer. As a result, an incident light to the liquid crystal panel is scattered and at the same time, diffracted. When the liquid crystal in in an ON condition, there is no difference in the refractive index between the diffraction grating and the liquid crystal, and the incident light passes straight through. Using the liquid crystal panel as a light valve, the light from a light source is incident to the liquid crystal panel, and the image formed on the liquid crystal panel is projected through a projection lens onto a screen. In the case of a black display, the incident light is scattered or diffracted in the liquid crystal panel according to the projected image. The scattered or diffracted light is stopped by a light shielding part of a aperture, and thus does not arrive at the screen.
    • 在液晶层的像素电极和相对电极中的至少一个的表面上形成具有不规则截面的层,以面对液晶层。 液晶层由聚合物分散液晶形成。 如果具有不规则截面的层规则地和循环地形成为凹凸图案,则由此形成的层用作衍射光栅。 当液晶处于OFF状态时,衍射光栅的折射率n与液晶层的折射率不同。 结果,向液晶面板的入射光被散射,同时衍射。 当液晶处于ON状态时,衍射光栅与液晶之间的折射率无差异,入射光直线通过。 使用液晶面板作为光阀,来自光源的光入射到液晶面板,并且形成在液晶面板上的图像通过投影透镜投射到屏幕上。 在黑色显示的情况下,根据投影图像,入射光在液晶面板中散射或衍射。 散射或衍射光被光圈的遮光部分阻挡,因此不会到达屏幕。