Polarization film

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Background Statement for SEMI Draft Document #5425
Revision to SEMI D46-0706: Terminology for FPD Polarizing Films
Notice: This background statement is not part of the balloted item. It is provided solely to assist the recipient in
reaching an informed decision based on the rationale of the activity that preceded the creation of this Document.
Notice: Recipients of this Document are invited to submit, with their comments, notification of any relevant
patented technology or copyrighted items of which they are aware and to provide supporting documentation. In this
context, “patented technology” is defined as technology for which a patent has issued or has been applied for. In the
latter case, only publicly available information on the contents of the patent application is to be provided.
Background Statement
This document is a revision of SEMI D46-0706 – Terminology for FPD Polarizing Films.
The first edition was publication in June, 2006. Due to the five years review, this revised version was prepared by
the Polarizing Film Task Force under the FPD Materials and Components Committee. This revised version was
approved as the draft for yellow ballot on April 27, 2012 in the FPD Materials and Components Committee Meeting.
The revised sub-clauses and parts are as follows:
4. Referenced Standards and Documents
Table 1. Types of Polarizer
Table 2. Films and Layers Composing Polarizing Films
Table 3. Type of Polarizing Film
Table 4. Characteristic
Table 5. Inspection/Defect
Table 6. Optical Factor
Figure 2. Schematic of Polarizing Film for OLED
No 2. Absorbing Polarizer
No 2. Retardation film
No 6. Anti-Glare
No 8. Anti-Reflection
No 9. Adhesive
No 14. Retardation film (Delete)
No 1. Transmission-type Polarizing Film
No 1. Polarization Efficiency
No 2. Single Transmittance
No 3. Cross Transmittance
No 4. Parallel Transmittance
No 6. Hue a*, b*
No 9. Hardness
No 11. Reflectance
No 13. Adhesion (peeling strength)
No 14. Adhesion (contact strength)
No 15. Scratch Resistance
No 19. Chemical Resistance
No 3. Crossed Nicol Inspection
No 4. Foreign Material
No 5. Babble
No 6. Scratch
No 8. Mura
No 9. Peeling
No 10. Crack
No 6. Polarizing Axis
Responses to this letter ballot will be reviewed by the Polarizing Film Task Force and adjudicated by the Japan FPD
Materials and Components Committee Meeting on Friday, November 2, 2012 at SEMI Japan office, Tokyo, Japan.
Notice: Additions are indicated by underline and deletions are indicated by strikethrough.
If you have any questions, please contact the Polarizing Film Task co-leaders:
Youzou Akada (Nitto Denkou Corporation), yuuzou_akada@gg.nitto.co.jp or
Yoshi Shibahara (Fujifilm Corporation), yoshihiko_shibahara@fujifilm.co.jp
or Naoko Tejima, SEMI Japan Staff, ntejima@semi.org.
Semiconductor Equipment and Materials International
3081 Zanker Road
San Jose, CA 95134-2127
Phone: 408.943.6900, Fax: 408.943.7943
SEMI Draft Document #5425
Revision to SEMI D46-0706: Terminology for FPD Polarizing Films
1 Purpose
1.1 In this standard, definition and interpretation of each term provides material characteristics used for Flat Panel
Display (FPD) manufacturing. This standard benefits unification of terminologies generally used for Polarizing
Films of FPD manufacturing.
2 Scope
2.1 This standard is applicable for Polarizing Films of FPD manufacturing. It covers terminologies related to
Polarizing Films of FPD manufacturing, used in the area of material, inspection, and measurement.
NOTICE: SEMI Standards and Safety Guidelines do not purport to address all safety issues associated with their
use. It is the responsibility of the users of the Documents to establish appropriate safety and health practices, and
determine the applicability of regulatory or other limitations prior to use.
3 Limitations
3.1 The intention of this standard is providing terminologies for Polarizing Films of FPD manufacturing only.
Hence, it does not cover any specific terminology used in a peculiar area (e.g., specialized terms based on personal
subjectivity) or minor materials and details of those materials either for special and general purpose.
4 Referenced Standards and Documents
4.1 None. SEMI Standards
SEMI D34 — Test Method for FPD Polarizing Films
SEMI D50 — Test Method for Surface Hardness of FPD Polarizing Film
SEMI D60 — Test Method of Surface Scratch Resistance for FPD Polarizing Film and Its Materials
SEMI D67 — Test Methods for Antifouling Property and Chemical Resistance of FPD Polarizing Films and its
Materials
4.2 ISO Standards 1
ISO 11664-1 (CIE S 014-1/E) — Colorimetry – Part 1: CIE Standard Colorimetric Observers
ISO 11664-4 (CIE S 014-4/E) — Colorimetry – Part 4: CIE 1976 L*a*b* Colour Space
4.3 JIS Standard 2
JIS K5600 — Testing methods for paints
JIS K7105 — Testing methods for optical properties of plastics
JIS Z0237 — Testing methods of pressure-sensitive adhesive tapes and sheets
NOTICE: Unless otherwise indicated, all documents cited shall be the latest published versions.
5 Terminology
5.1 Definitions and Interpretations
5.1.1 Types of polarizer (1–5) (see Table 1)
5.1.2 Films and layers composing polarizing films (1–14 13) (see Table 2)
5.1.3 Type of polarizing (1–3) (see Table 3)
5.1.4 Characteristic (1–18 19) (see Table 4)
1
International Organization for Standardization, ISO Central Secretariat, 1 rue de Varembé, Case postale 56, CH-1211 Geneva 20, Switzerland;
Telephone: 41.22.749.01.11, Fax: 41.22.733.34.30, http://www.iso.ch
2
Japanese Industrial Standards; Available through the Japanese Standards Association, 1-24, Akasaka 4-Chome, Minato-ku, Tokyo 107-8440,
Japan, Telephone: 81.3.3583.8005; Fax: 81.3.3586.2014, Website: www.jsa.or.jp
This is a Draft Document of the SEMI International Standards program. No material on this page is to be construed as an official or adopted Standard or Safety Guideline.
Permission is granted to reproduce and/or distribute this document, in whole or in part, only within the scope of SEMI International Standards committee (document
development) activity. All other reproduction and/or distribution without the prior written consent of SEMI is prohibited.
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5.1.5 Inspection / Defect (1–8 10) (see Table 5)
5.1.6 Optical Factor (1–10) (see Table 6)
Types of Polarizer
No
Term
Definition
Interpretation
1
Polarizer
Generic term of optical devices which are PVA (Poly Vinyl Alcohol) is generally
capable to generate polarized light from used for base films.
natural light.
2
Absorbing Polarizer
Polarizer which generate polarized light
using polarized two-color absorption. It
mainly functions as linear polarizer.
Depending on the type of dicronic
absorber, they include iodine type, dye
type, etc. Polarizers made of PVA (Poly
Vinyl Alcohol film) with iodine or dyes
impregnated are generally used.
3
Iodine type Polarizer
Polarizer using iodic complex as twocolor absorber.
They are highly balanced in
transmissivity, polarization degree, and
achromatic property, and are currently
mainstream of polarizers used for FPDs.
4
Dye type Polarizer
Polarizer using dye as two-color absorber. As the dye itself has high durability, they
are suitable for applications requiring
higher durability such as in-car products.
5
Reflecting Polarizer
Polarizer which generates polarized light
using selective reflection.
There are two types: linear polarization
selectivity and circular polarization
selectivity.
They include polarizers using circular
dichronism of cholesteric liquid crystal
and polarizers using mismatching
between birefringence and refraction
factors of layers.
They also include polarizers using
selective reflection of linear polarization
on inclined incident multi-layer thin films,
which are broadly used with absorbing
polarizers for improving light utilization
efficiency.
Especially, the latter ones are aboundingly
used for projectors, etc.
Films and Layers Composing Polarizing Films
No
Term
Definition
Interpretation
1
Retarder
Optical device which gives phase shift to They are generally called /4 films or /2
polarized light depending on its optical
films, and are the generic name of optical
axis.
devices which change polarizing
conditions.
2
Retardation Film
Birefringent film. Optical-anisotropic film As one with the polarizing film, makes
that possesses either single or double
possible black/white display and expands
optical axis.
the viewing angle of the LCD panel.
3
Compensation Film
Name of the optical film used to improve Depending on the LCD panel design,
the display characteristics of the LCD
compensation film is selected and
panel.
combined with the polarizing film.
4
Wide Viewing Angle Film
Film that widens LCD panel viewing
angle.
Generally acts as a visual angle
compensating layer in the film that forms
the polarizing film.
5
Protective Layer#1
Film used to protect the polarizer.
TAC (Tri Acetyl Cellulose) is used the
most as a base film.
This is a Draft Document of the SEMI International Standards program. No material on this page is to be construed as an official or adopted Standard or Safety Guideline.
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development) activity. All other reproduction and/or distribution without the prior written consent of SEMI is prohibited.
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Term
Definition
Interpretation
6
Anti-Glare
Layer which reduce glare by forming
Generally, particles such as silica are
scattering layer on the surface of
mixed in the UV hardening resin, forming
protection layer. Treatment performed on unevenness on the surface.
a film surface to reduce glare by forming
micro-structure on its top surface layer to
induce scattering.
7
Hard Coat
Resin coated on the surface of protection Generally, there is AG (Anti-Glare
layer in order to prevent damage to the
abbreviation) hard coat and clear hard
surface of the polarizing film.
coat, and particles such as silica are mixed
into AG hard coat.
8
Anti-Reflection
Layer which reduces the light reflection In contrast to antiglare, which disperses
by processing multilayer thin films on the light, anti-reflection has the function of
surface of protection layer. Treatment
decreasing reflected light.
performed on a film surface to eliminate
reflected light, for example, by coating of
film having different refractive indexes.
9
Adhesive#1
Acts as an adhesion layer to attach the
polarizing film to the LCD panel.
Chemical compound which acts as an
adhesion layer to attach the polarizing
film to the FPD panel.
An adhesive that can be peeled off
afterwards.
10
Separator
De-molded film adhered on adhesive
layer of polarizing film, which is also
called “Release Liner.”
Generally, silicon-processed polyester
film is used.
11
Reflector
Optical device which symmetrically
reflects light on the normal line.
For the devices with high reflectivity,
metal reflection or multi-layer reflection
with dielectric materials is used.
12
Transflective Reflector
Optical device which transmits one part of Layer which transmits light from the rear
light and reflects the other part.
side and reflects light from the front side.
Effective for power saving by utilizing
external light.
13
Polarization Conversion Film
Film that utilizes polarized light,
Makes it possible to increase the
separation functionality to increase light, brightness of the LCD as seen from
utilization efficiency.
directly in front and diagonally.
14
Retardation Film
Birefringent film.
As one with the polarizing film, makes
possible black/white display and expands
the viewing angle of the LCD panel.
#1 Basic Structure of Polarizer
Protective Film
Protective Layer
Polarizer
Protective Layer
Adhesive
Separator
Type of Polarizing Film
No
Term
Definition
Interpretation
1
Transmission-type Polarizing Film Polarizer that uses transmitted light.
Used for LCD panels which display using
a backlight (see Figure 1).
Used also for OLED panels.
2
Reflection-type Polarizing Film
Used on the bottom of a eflection-type
LCD panels that has a reflector adhered to
the polarizing film.
Polarizer that uses reflected light.
This is a Draft Document of the SEMI International Standards program. No material on this page is to be construed as an official or adopted Standard or Safety Guideline.
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Reflector is used on the bottom surface of
transmission-type polarizing film to
reflect incident light (see Figure 1).
3
Transflection-type Polarizing Film
Polarizer with both transmission-type and Polarizer with an attached transflector, it
reflection-type functions.
is used as a bottom-side polarizer on a
transflection-type LCD panel.
Transflector is used on the bottom surface
of transmission-type polarizing film to
utilize backlight and reflected incident
light (see Figure 1).
Characteristic
No
Term
Definition
Interpretation
(1) Value (Py) calculated from the
following formula using Parallel
Transmittance (T//) and Cross
Transmittance (T┴).
1
Polarization Efficiency
Refer to SEMI D34.
1) Measurement Method
Measurement Equipment:
Spectrophotometer
Measurement Wavelength: 400~700nm
T//  T
Py 
x 100 (%)
(10 nm)
T//  T
Light Source: standard illuminant C, 2°
(2) Value calculated from the following range of view
formula using transmittance TA (visibility 2) Ty, T┴, and T// can be calculated from
corrected) on the absorption axis and
the following formulas using the
transmittance TB (visibility corrected) on polarizer’s transmittance TA (visibility
the transmittance axis.
corrected) on the absorption axis and
transmittance TB (visibility corrected) on
T  TA
the transmittance axis.
Py  B
x 100 (%)
TB  TA
Ty = (TA + TB)/2
T┴ = TA × TB
Value (Ty) of Transmittance of 1
polarizing film, visibility corrected (JIS T// = (TA2 + TB2)/2
Z8701) (ISO 11664-1).
2
Single Transmittance
3
Cross Transmittance
Value (T┴) of Transmittance of 2
polarizing films placed crossed Nicol,
visually corrected (JIS Z8701) (ISO
11664-1).
4
Parallel Transmittance
Value (T//) of Transmittance of 2
polarizing films placed parallel Nicol,
visibility corrected (JIS Z8701) (ISO
11664-1).
5
Transmittance at 380 nm
Value of transmittance of 1 polarizing
film measured at 380 nm.
Expresses Polarizer UV Cut Performance
Measurement Equipment:
Spectrophotometer Measurement
Wavelength: 380 nm light Source:
standard illuminant C, 2° range of view
6
Hue a*, b*
Hue value measured in accordance with
JIS Z 8729 ISO 11664-4.
a*: (+side) Red,
(-side) Green
b*: (+side) Yellow,
(-side) Blue
In accordance with JISZ8701, a* and b*
can also be Hue value is also expressed
with a and b.
This is a Draft Document of the SEMI International Standards program. No material on this page is to be construed as an official or adopted Standard or Safety Guideline.
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Term
Definition
Interpretation
7
Haze
Value (H) expressed in the ratio below,
using scattered transmittance (Td) and
total transmittance (Tt) measured in
accordance with JISK7105.
H = Td/Tt × 100 (%)
Expresses film’s degree of light
scattering. The smaller the value, the
weaker the scattering.
8
Specular Reflectance
Ratio of the reflected rays that remains
parallel to total reflected light rays for
parallel incident rays.
The smoother the surface, the larger the
value of specular reflectance.
9
Hardness
Film surface hardness measured in
accordance with JIS K5400 SEMI D50,
expressed in pencil hardness.
The larger the value, the harder the
surface.
10
Retardation Value
When nx designates the refractive index of
an optically anisotropic substance in the
direction where refractive index is largest
(the slow axis), ny is the refractive index
in the direction where it is smallest (the
fast axis), and d is thickness, Retardation
value (R) is defined with the following
formula.
R = (nx - ny) × d (nm)
Retardation value of thickness direction is
expressed with Rth or Rt, which is defined
with the following formulas.
Rth = [(( nx + ny)/2)-nz] × d (nm)
Rt = (nx - nz) × d (nm)
11
Reflectance
Ratio of the regularly reflected part of the Usually expressed in visibility corrected
(whole) reflected flux, to the incident
reflectance. Standard illumination of C or
flux.
D65 is used.
In a substance where refractive index
differs (n1/n2), light is reflected at the
boundary. The below formula defines the
index which shows the degree of
reflection.
R = (n1 - n2)2 / (n1 + n2)2 × 100 (%)
12
Glossiness
In accordance with JIS K7105, the ratio,
expressed in percent, of 60° parallel
incident rays, that reflect (mirror
reflection light) in a −60° direction
(normal reflection direction).
13
Adhesion (JIS Z0237 peeling
strength)
In accordance with JIS Z0237, the
Exfoliating power at fixed width and at
measured adhesive strength when peeling fixed speed, in 180° or 90° direction.
the material from the substrate.
14
Adhesion (JIS K5600 contact
strength)
Value measured in accordance with JIS
K5600-5-6 (cross-cut test).
15
Scratch Resistance
Expresses how difficult it is to scratch the With steel wool, cloth, etc., graze the base
object’s surface in accordance with SEMI plate surface at a fixed frequency with
D60.
constant weight and constant speed, and
evaluate the scratch condition of the
surface.
16
Heat Resistance
Stability of the material’s optical
characteristics and adhesive
characteristics in regards to heat
(e.g., 80°C × 500 hrs)
17
Humidity Resistance
Stability of the material’s optical
characteristics and adhesive
characteristics in regards to humidity
(e.g., 60°C / 90% RH × 500 hrs)
18
Image Definition
The degree of clarity of the transmitted or The larger the value, the higher the
reflected image. Stipulated in JIS K7105. definition.
Numerical value that expresses the extent
of the surface’s gloss.
Extent of adhesion between material and
coating film, or between coating films.
Change in optical quality is shown in
transmittance change, change in
polarization, and change in hue, etc.
Change of adhesion quality is displayed in
the presence of peeling, foaming,
wrinkles and cracks. If there are no
changes, or the change is small, then the
material is superior.
This is a Draft Document of the SEMI International Standards program. No material on this page is to be construed as an official or adopted Standard or Safety Guideline.
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19
Term
Chemical Resistance
Definition
Resistance to chemical reagents
determined in accordance with SEMI
D67.
Interpretation
Chemical reagents may include acids,
alkalis, solvents, alcohols, lubricants,
cleaning agents, marker pens, foods,
cosmetics or any material that may come
in contact with the test material in
potential end use environments and
manufacturing processes.
Inspection/Defect
No
Term
Definition
Interpretation
1
Reflection Inspection
Polarizer appearance inspection method
that utilizes reflected light.
Method that uses fluorescent light on a
blackboard to detect defects such as
unevenness, scratches, etc.
2
Transmission Inspection
Polarizer appearance inspection method
that utilizes transmitted light.
Method performed on a backlight to
detect foreign material defects on the
polarizer.
3
Cross Inspection
Polarizer appearance inspection method
using polarizeding light principles films
place crossed Nicol.
Method where by placing one reference
polarizer on a backlight in perpendicular
direction, luminescent defects can be
detected.
4
Foreign Material
Name for a polarizer defect that appears
as foreign material or defect caused with
foreign material.
Allowable foreign material size is
determined by LCD panel pixel size.
Foreign material size is expressed;
φ = (Long side + short side)/2.
5
Bubble
Name for polarizer defect that appears as Allowable bubble size is determined by
a bubble. Bubble-shape defect consisting LCD FPD panel pixel size. Bubble size is
of a cavity in paste of a protective film or expressed; φ = (Long side + short side)/2.
a polarizer.
6
Scratch
Name for polarizer defect that appears as Because scars which occur on a polarizer
a scratch. Scratch defects are caused by
surface above the LCD FPD panel can
scratching polarizer surface.
easily become defects, hard-coated
polarizer is often used.
7
Stain
Name for polarizer defect that appears as As seen in polarizers that have been
a stain.
antiglare processed and acid-resist
processed, but can have different names
depending upon color and shape.
8
Uniformity Mura
9
Peeling
10
Crack
Name for defect that appears as a spot has Optical unevenness that occurs when a
an area larger than a pixel and unclear
LCD FPD panel with a polarizer stuck to
boundaries.
it is illuminated. There is a tendency for
unevenness to exist as LCD FPD panel
brightness improves.
Name of defect that appears as a
Peeling often breaks out from the edge of
detachment of adhesive layers of
polarizing film.
polarizer, polarizing film, protective layer
or retardation film.
Name of defect that appears as a thin line Crack often breaks out from the edge of
on the surface of polarizer, polarizing
the polarizing film. The acceptable range
film, protective layer or retardation film. is determined with the length and with
possible growth with time.
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Optical Factor
No
Term
Definition
Interpretation
1
Natural Light
Light without deflection of oscillation
directions.
Generally, light immediately emitted from
a light source.
2
Polarized Light
Light with deflection of oscillation
directions.
Generally, light with deflection of
oscillation directions by being passed
through a polarizer.
3
Circular Polarized Light
From the viewpoint of an observer who is Can be produced by combining a
aligned with the traveling direction of
polarizing film and quarter-wave
light, the tip of the light wave (electric
retardation film plate at a 45° angle.
vector) travels in a circle.
4
Linear Polarized Light
Light that is in the same plane as the light Can be produced by linear polarizing
wave’s (electric vector) amplitude.
film.
5
Elliptical Polarized
Light From the viewpoint of an observer Can be produced by combining the
who is aligned with the traveling direction polarizing film and the retardation plate.
of light, the tip of the light wave (electric
vector) travels in an ellipse.
6
Polarizing Axis
The axis which lets through light waves
of a certain direction alone, out of light
waves coming vertically to polarizer.
Synonymous with Transmission axis.
Vertical to the direction the polarizer is
stretched. Synonymous with Transmission
axis.
7
Transmission Axis
The axis which lets through light waves
of a certain direction alone, out of light
waves coming vertically to polarizer.
Vertical to the direction the polarizer is
stretched. Synonymous with Polarizing
axis.
8
Absorption Axis
The axis which blocks out light waves of Parallel to the direction in which the
a certain direction alone, out of light
polarizer is stretched.
waves coming vertically to polarizer.
9
Anisotropy of Refractive Index
Differs depending upon the direction
where refractive index of light is
measured.
10
Dichroic Ratio
The ratio of absorption along two axes for Generally, substances with big dichroic
a substance in which anisotropy is shown ratios display better polarizing polarizer
to absorption of light.
performance.
One of the physical properties of
retardation film.
6 Related Documents
6.1 JIS Standard3
JIS K5600 — Testing methods for paints
JIS K7105 — Testing methods for optical properties of plastics
JIS Z0237 — Testing methods of pressure-sensitive adhesive tapes and sheets
JIS Z8701 — Color specification -- The CIE 1931 standard colorimetric system and the CIE 1964 supplementary
standard colorimetric system
JIS Z8729 — Color specification -- CIELAB and CIELUV color spaces
3
Japanese Industrial Standards; Available through the Japanese Standards Association, 1-24, Akasaka 4-Chome, Minato-ku, Tokyo 107-8440,
Japan, Telephone: 81.3.3583.8005; Fax: 81.3.3586.2014, Website: www.jsa.or.jp
This is a Draft Document of the SEMI International Standards program. No material on this page is to be construed as an official or adopted Standard or Safety Guideline.
Permission is granted to reproduce and/or distribute this document, in whole or in part, only within the scope of SEMI International Standards committee (document
development) activity. All other reproduction and/or distribution without the prior written consent of SEMI is prohibited.
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Trance mission type LCD
Anti-Glare and Anti-reflection layer
Polarization film
Retardation film
LC CELL
Retardation firm
Polarization film
Polarization enhancement film
Reflector type LCD
[Old Type]
Polarization film
LC CELL
Polarization film
Reflector
[New Type]
Polarization film
Retardation film
LC Cell
Internal reflector layer
Trance-reflective type LCD
[Old Type]
Polarization film
LC CELL
Polarization film
Trance-reflector
[New Type]
Polarization film
Retardation film
LC Cell
Retardation film
Polarization film
Polarization enhancement film
Figure 1
Schematic of Polarizing Film
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Polarization film
Retardation film
OLED
Figure 2
Schematic of Polarizing Film for OLED
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LETTER (YELLOW) BALLOT
DRAFT
Document Number: 5425
Date: 2/9/2016
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