The document discusses re-writable electronic paper (e-paper) as an alternative to printed paper. It proposes that e-paper which uses optical photographic technology is flexible, thin, re-writable, cost effective and can retain images without power. The document examines different technologies for e-paper before focusing on optical liquid crystal technology, which does not require electrodes, power sources or complex manufacturing. It suggests this approach could enable low-cost, long-lasting e-paper.

1. E-paper alternative of normal printed paper:
exible,re-writable,thin,portable,optical
photographic technology and cost eective
Student of Computer Science and Engineering,
American International University-Bangladesh(AIUB)
Banani,Dhaka-1213
Abstract. Re-writable optical E-paper is very important contribution
for green technology. E-paper replaces normal print paper. The re-writable
E-paper display can perform operation without electronic scheme, con-
ductive layer , power sources. E-paper displays use LC alignment under
discloser of a polarized UV light that helps to erase and rewrite many
times on the same E-paper display. E-paper which display prepares us-
ing optical photographic technology were
exible, thin, rewritable, cost
eective and can retain image without an activated electric

2. eld.
Keywords: Displays, cost eective, optical photographic technology,
exible structures, rewritable.
1 Introduction
E-Paper means Electronic Paper, an alternative of real paper. In our daily life
we use huge amount of paper. Day by day the demand of paper increasing. And
paper are prepare from many sources. One of the sources is tree. As a result
we cut large number of tree for the purpose of making paper. And we know the
rule of tree for our existence. So the development of E-Paper and increase of use
of E-Paper can reduce the cut of tree amazingly. From few decades of trying,
scientists are near to develop an E-paper which is convenient to read, write and
study in our daily life. It is time to think that E-paper is as remarkable as the
second discovery of printing press in the 15th century. Made by
exible material,
require low power consumption, cheap to manufacture and most important easy
and convenient to read and write.
2 E-paper:
To understand the goal of this research paper

3. rst we need to have knowledge
about E-paper.Acoording to Margaret Rouse, Editorial Director of WhatIs.com,
gave a de

4. nition in May 2007: E-paper is a handy, reusable display system
which works just as normal printed paper but constantly written on by electronic
means millions of times.[1] The latest de

5. nition given by Wikipedia is as follows:

6. 2
Electronic paper, e paper and electronic ink are display technologies which are
designed to mimic the appearance of ordinary ink on paper. Unlike conventional
backlit
at panel displays which emit light, electronic paper displays re
ect light
like ordinary paper, theoretically making it more comfortable to read, and giving
the surface a wider viewing angle compared to conventional displays. See the
Wiki de

7. nation site (http://en.wikipedia.org/wiki/Electronic_paper)
3 Related Works:
3.1 Seiko:
Seiko Epson made a thin elastic 200 ppi display that uses electrophoresis elec-
tronic paper enriched by E ink company. this 2-inches display has 320 x 240
pixels. This thin
exible display enriched using SUFTLA technology which leads
the display system into dot technology display.
3.2 Fujitsu:
Fujitsu developed a E-paper display using re
ective cholesteric liquid crystal
technology. Fujitsu say that their E-paper is semi permanent display system.
They also claim that their display system can operate without power connection.
they also proclaimed that they create world

8. rst color E-paper.
3.3 Bridgestone:
Bridgestone developed super thin color E-paper. Bridgestone claims that their
E-paper is the most thinnest display in the world. they also demands that their
display system support more than four thousands colors.
Fig. 1. Seiko Rewritable Display Fig. 2. Fujitsu Flexible Display
4 Challenges and Possibilities of E-paper:
There are dierent ways of developing E-paper such as: E- paper displays made
from microbial cellulose, E-paper using Organic FETs with Organic Photodi-
odes, Particle display technology based E-paper, E-paper based on electrophoretic
technology, optical liquid crystal technology.

9. Title Suppressed Due to Excessive Length 3
Among these technologies optical liquid crystal technology is more conve-
nient, easy to write and read, rewritable thin sheet,
exible and light and cost
eective. Now the main challenges come: Why it is convenient? How optical
liquid crystal technology is works? How much it is cost eective?
In our modern era of technology optical reusable photoaligning displays have
made amazing improvement that help us to detach E-paper display unit and
lead us in optoelectronic parts [2]. It dont have electrode, have grey scale abil-
ity, surely steady and dont need power sources to perform its operation like
view image, show dierent document and write in it[3]. my E-paper formation
amazingly reduce the complication of E-paper displays. It also reduce cost and
supports for long time functionality. the long time functionality and less power
consumption make it the super competitive E-paper dispaly device. And it makes
my display system convenient, easy to use and cost eective. New LC devices
Fig. 3. optically rewritable E-paper
based on photoaligning technology were anticipated, with decorative retarders
for 3D applications, lenses with electrically tunable main space, LC based sen-
sors, switchable q-plates, and optically reusable Epaper[3]. The photoalignment
resources were frequently photosensitive azo-dye layers. The arrangement of azo-
dye layers and liquid crystal polymers were also used for photoalignment phase
retarders. The convenient applications of new LC elements in 3D displays and
other LC technology areas are envisaged[4].
5 Result:
My research topic oers a new theory of elastic reusable device that can run
and keep information. this display system run without power source and stands
for long time. The optical reusable display is based on a coil roaming formation
and photoalignment technology makes manufacture method esiaer then usual
TN LCD[5]. The arti

10. cial display system without ITO can use. We propose a

11. 4
fresh theory for LC alignment and E-paper system. The system canuse not only
for the displaybut also safety cards.[4]
6 Conclusion:
Conclusion: In our modern era of technology and education, we need huge
amount of paper every day life. The demand of paper for each person of United
State Of America is about 749 pounds every year. For this reason from last few
decades scientists try to develop an alternative source of printed paper. And they
introduced us with the concept of E-paper. E-paper which is rewritable,
exi-
ble, light, cost eective and convenient to use are the main challenges to meet.
Among dierent technologies optical photographic technology is most suitable
that can full

12. ll most of the demand of E-paper.
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