Browse Prior Art Database

Filter for Thin Film Transistor/Liquid Crystal Display

IP.com Disclosure Number: IPCOM000104722D
Original Publication Date: 1993-May-01
Included in the Prior Art Database: 2005-Mar-19
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Tajima, K: AUTHOR [+3]

Abstract

Disclosed is a filter for Thin Film Transistor/Liquid Crystal Display (TFT/LCD) which switches the display mode between "the smooth curve mode" and "the dot by dot distinct mode". When diagonal lines or curves are displayed on TFT/LCD, those lines and curves can be seen as dotted lines and curves. By employing the characteristic of scattering effect of the polymer mixed type liquid crystal cell as a filter, curves can be seen as smooth curves.

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Filter for Thin Film Transistor/Liquid Crystal Display

      Disclosed is a filter for Thin Film Transistor/Liquid Crystal
Display (TFT/LCD) which switches the display mode between "the smooth
curve mode" and "the dot by dot distinct mode".  When diagonal lines
or curves are displayed on TFT/LCD, those lines and curves can be
seen as dotted lines and curves.  By employing the characteristic of
scattering effect of the polymer mixed type liquid crystal cell as a
filter, curves can be seen as smooth curves.

      Fig. 1 shows a example of using this filter 1 on the TFT/LCD.
When switch 2 is turned ON, the filter 1 is almost transparent, so
"curves" displayed are seen as dotted lines.  When the switch 2 is
turned OFF, the filter 1 scatters the transmitting light, so the
TFT/LCD pixels are looked shading and "curves" displayed  can be seen
smoothly.  Fig. 2 shows the structure of the filter 1.  The polymer
mixed-type liquid crystal 3 is sandwiched with the films 4 with ITO
electrode.  Two electrodes are wired out the filter and connected to
the voltage source.  When the supplied voltage between two electrodes
is zero or below liquid crystal (LC) threshold voltage, this LC
scatters incident light.  When the supplied voltage is high, or above
LC threshold voltage, this LC transmit almost all the incident light.