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1. WO2020200164 - A SELECTIVELY ERASABLE LIQUID CRYSTAL WRITING BOARD


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INTERNATIONAL SEARCH REPORT (ISR)
Part 1:  1  2  3  4  5  6          Part 2:  A  B  C  D  E 
International application No. Applicant's or agent's file reference
PCT/CN2020/082061 14505POJLC
International filing date (day/month/year) (Earliest) Priority Date (day/month/year)
30 March 2020 03 April 2019
Applicant
SMART LIQUID CRYSTAL TECHNOLOGIES CO., LTD.
FOR FURTHER ACTION: See Form PCT/ISA/220 as well as, where applicable, item 5 below.
This international search report has been prepared by this International Searching Authority and is transmitted to the applicant according to Article 18. A copy is being transmitted to the International Bureau.
It is also accompanied by a copy of each prior art document cited in this report.
1. Basis of the report
a. With regard to the language, the international search was carried out on the basis of:
the international application in the language in which it was filed.
a translation of the international application into                                          which is the language of a translation furnished for the purposes of international search (Rules 12.3(a) and 23.1(b)).
b.
This international search report has been established taking into account the rectification of an obvious mistake authorized by or notified to this Authority under Rule 91 (Rule 43.6bis(a)).
c.
With regard to any nucleotide and/or amino acid sequence disclosed in the international application, the international search was carried out on the basis of a sequence listing:
2. Certain claims were found unsearchable
3. Unity of invention is lacking
4. Title of the invention
The text is approved as submitted by the applicant.
The text has been established by this Authority to read as follows:
5. Abstract
The text is approved as submitted by the applicant.
The text has been established, according to Rule 38.2, by this Authority as it appears in Box No. IV. The applicant may, within one month from the date of mailing of this international search report, submit comments to this Authority.

A selectively erasable liquid crystal writing board, wherein the liquid crystal writing board comprises: a first substrate(10), a first conductive layer(20), a functional layer(30), a liquid crystal layer(40), a second transparent conductive layer(50) and a second transparent substrate(60) stacked in sequence, wherein an external electric field can be applied to the selectively erasable liquid crystal writing board via the first conductive layer(20) and the second transparent conductive layer(50), wherein upon application of an external mechanical pressure on a selected area of the liquid crystal writing board, the fractional voltage across the functional layer(30) in the selected area is reduced, and the fractional voltage across the liquid crystal layer(40) in the selected area is increased to reach a threshold voltage required to switch the liquid crystal molecules in the liquid crystal layer(40) to a desired state. The selectively erasable liquid crystal writing board has advantages of a convenient operation, low cost and no erasing trace residue.


6. Drawings
a.
The figure of the drawings to be published with the abstract is Figure No.     FIG.3    
as suggested by the applicant.
as selected by this Authority, because the applicant failed to suggest a figure.
as selected by this Authority, because this figure better characterizes the invention.
b.
none of the figures is to be published with the abstract.

A. CLASSIFICATION OF SUBJECT MATTER

According to International Patent Classification (IPC) or to both national classification and IPC

B. FIELDS SEARCHED

Minimum documentation searched (classification system followed by classification symbols):
     G02F; G06F
Documentation searched other than minimum documentation to the extent that such documents are included in the fields searched:
Electronic data base consulted during the international search (name of data base and, where practicable, search terms used):
CNPAT,CNKI,WPI,EPODOC:erasable, liquid crystal, writing board, selectively, substrate, conductive, voltage

C. DOCUMENTS CONSIDERED TO BE RELEVANT

Category* Citation of document, with indication, where appropriate, of the relevant passages Relevant to claim No.
(1)
A
CN 107728398 A (JIA, PEIMIN) 23 February 2018 (2018-02-23)
1-18
description, paragraphs 30-41 and figure 1
(2)
A
CN 107820582 A (WICUE INC.) 20 March 2018 (2018-03-20)
1-18
the whole document
(3)
A
CN 107066153 A (SHENZHEN PINGROU TECHNOLOGY CO., LTD.) 18 August 2017 (2017-08-18)
1-18
the whole document
(4)
A
CN 108828821 A (GUANGZHOU LINDENG TECHNOLOGY CO., LTD.) 16 November 2018 (2018-11-16)
1-18
the whole document
(5)
A
CN 207529068 U (SHENZHEN HONGHE INNOVATION INFORMATION TECHNOLOGY CO., LTD.) 22 June 2018 (2018-06-22)
1-18
the whole document
(6)
A
US 2015054775 A1 (KENT DISPLAYS INC.) 26 February 2015 (2015-02-26)
1-18
the whole document
*
Special categories of cited documents:
"A"
document defining the general state of the art which is not considered to be of particular relevance
"D"
document cited by the applicant in the international application
"E"
earlier application or patent but published on or after the international filing date
"L"
document which may throw doubts on priority claim(s) or which is cited to establish the publication date of another citation or other special reason (as specified)
"O"
document referring to an oral disclosure, use, exhibition or other means
"P"
document published prior to the international filing date but later than the priority date claimed
"T"
later document published after the international filing date or priority date and not in conflict with the application but cited to understand the principle or theory underlying the invention
"X"
document of particular relevance; the claimed invention cannot be considered novel or cannot be considered to involve an inventive step when the document is taken alone
"Y"
document of particular relevance; the claimed invention cannot be considered to involve an inventive step when the document is combined with one or more other such documents, such combination being obvious to a person skilled in the art
"&"
document member of the same patent family

D. INFORMATION ON PATENT FAMILY MEMBERS

Patent document cited in search report Publication date
(day/month/year)
Patent family member(s) Publication date
(day/month/year)
CN 107728398 A
23 February 2018
CN 207663190 U
27 July 2018
CN 107820582 A
20 March 2018
WO 2016176508 A1
US 2018143475 A1
03 November 2016
24 May 2018
CN 107066153 A
18 August 2017
None
CN 108828821 A
16 November 2018
WO 2020000767 A1
02 January 2020
CN 207529068 U
22 June 2018
None
US 2015054775 A1
26 February 2015
US 9235096 B2
12 January 2016
Name and mailing address of the ISA/:
National Intellectual Property Administration, PRC
6, Xitucheng Rd., Jimen Bridge, Haidian District, Beijing 100088
China
Facsimile No. (86-10)62019451
Date of the actual completion of the international search:
09 June 2020
Date of mailing of the international search report:
03 July 2020
Authorized officer:
YANG,Yuyu
Telephone No. 86-(10)-53962592
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