The Info List - IPS Panel

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IPS (in-plane switching) is a screen technology for liquid-crystal displays (LCDs). It was designed to solve the main limitations of the twisted nematic field effect (TN) matrix LCDs which were prevalent in the late 1980s. These limitations included strong viewing angle dependence and low-quality color reproduction. In-plane switching involves arranging and switching the orientation of the molecules of the liquid crystal (LC) layer between the glass substrates. This is done, essentially, parallel to these glass plates.[1]


1 History 2 Technology

2.1 Implementation 2.2 Advantages 2.3 Disadvantages

3 IPS Alternative Technologies

3.1 Plane to Line Switching (PLS) 3.2 Advanced Hyper-Viewing Angle (AHVA)

4 Manufacturers 5 See also 6 References 7 External links

History[edit] The TN method was the only viable technology for active matrix TFT LCDs in the late 1980s and early 1990s. Early panels showed grayscale inversion from up to down,[2] and had a high response time (for this kind of transition, 1 ms is visually better than 5 ms). In the mid-1990s new technologies were developed—typically IPS and Vertical Alignment (VA)—that could resolve these weaknesses and were applied to large computer monitor panels. One approach patented on October 14, 1996 was to use inter-digitated electrodes on one glass substrate only to produce an electric field essentially parallel to the glass substrates.[3][4] However, the inventor was not yet able to implement such IPS-LCDs superior to TN displays. After thorough analysis, details of advantageous molecular arrangements were filed in Germany
by Guenter Baur et al. and patented in various countries including the US on 9 January 1990.[5][6] The Fraunhofer Society
Fraunhofer Society
in Freiburg, where the inventors worked, assigned these patents to Merck KGaA, Darmstadt, Germany. Shortly thereafter, Hitachi
of Japan filed patents to improve this technology. A leader in this field was Katsumi Kondo, who worked at the Hitachi
Research Center.[7] In 1992, engineers at Hitachi
worked out various practical details of the IPS technology to interconnect the thin-film transistor array as a matrix and to avoid undesirable stray fields in between pixels.[8][9] Hitachi
also improved the viewing angle dependence further by optimizing the shape of the electrodes (Super IPS). NEC
and Hitachi
became early manufacturers of active-matrix addressed LCDs based on the IPS technology. This is a milestone for implementing large-screen LCDs having acceptable visual performance for flat-panel computer monitors and television screens. In 1996, Samsung
developed the optical patterning technique that enables multi-domain LCD. Multi-domain and in-plane switching subsequently remain the dominant LCD designs through 2006.[10] Later, LG Display, Cherry Mobile Displays and other South Korean, Japanese, and Taiwanese LCD manufacturers adapted IPS technology. Today, IPS technology is widely used in panels for TVs, tablet computers, and smartphones. In particular, all Apple Inc.
Apple Inc.
products marketed with the label Retina Display
Retina Display
(such as iPhone 4 onwards,[11] iPad 3 onwards,[12] iPad Mini 2 onwards, Mac Book Pro with Retina display[13]) feature IPS LCDs with LED backlighting.

IPS technology development[14][15]

Name Nickname Year Advantage Transmittance/ contrast ratio Remarks

Super TFT IPS 1996 Wide viewing angle 100/100 Base level Most panels also support true 8-bit per channel colour. These improvements came at the cost of a lower response time, initially about 50 ms. IPS panels were also extremely expensive.

Super-IPS S-IPS 1998 Colour shift free 100/137 IPS has since been superseded by S-IPS (Super-IPS, Hitachi
Ltd. in 1998), which has all the benefits of IPS technology with the addition of improved pixel refresh timing.[quantify]

Advanced Super-IPS AS-IPS 2002 High transmittance 130/250 AS-IPS, also developed by Hitachi
Ltd. in 2002, improves substantially[quantify] on the contrast ratio of traditional S-IPS panels to the point where they are second only to some S-PVAs.[citation needed]

IPS-Provectus IPS-Pro 2004 High contrast ratio 137/313 The latest panel from IPS Alpha Technology with a wider colour gamut[quantify] and contrast ratio[quantify] matching PVA and ASV displays without off-angle glowing.[citation needed]

IPS alpha IPS-Pro 2008 High contrast ratio

Next generation of IPS-Pro

IPS alpha next gen IPS-Pro 2010 High contrast ratio

LG IPS technology development

Name Nickname Year Remarks

Horizontal IPS H-IPS 2007 Improves[quantify] contrast ratio by twisting electrode plane layout. Also introduces an optional Advanced True White polarizing film from NEC, to make white look more natural[quantify]. This is used in professional/photography LCDs.[citation needed]

Enhanced IPS E-IPS 2009 Wider[quantify] aperture for light transmission, enabling the use of lower-power, cheaper backlights. Improves[quantify] diagonal viewing angle and further reduce response time to 5ms.[citation needed]

Professional IPS P-IPS 2010 Offer 1.07 billion colours (30-bit colour depth).[citation needed] More possible orientations per sub-pixel (1024 as opposed to 256) and produces a better[quantify] true colour depth.

Advanced High Performance IPS AH-IPS 2011 Improved colour accuracy, increased resolution and PPI, and greater light transmission for lower power consumption.[16]


Schematic diagram IPS LC display

Implementation[edit] In this case, both linear polarizing filters P and A have their axes of transmission in the same direction. To obtain the 90 degree twisted nematic structure of the LC layer between the two glass plates without an applied electric field (OFF state), the inner surfaces of the glass plates are treated to align the bordering LC molecules at a right angle. This molecular structure is practically the same as in TN LCDs. However, the arrangement of the electrodes e1 and e2 is different. Because they are in the same plane and on a single glass plate, they generate an electric field essentially parallel to this plate. The diagram is not to scale: the LC layer is only a few micrometers thick and so is very small compared with the distance between the electrodes. The LC molecules have a positive dielectric anisotropy and align themselves with their long axis parallel to an applied electrical field. In the OFF state (shown on the left), entering light L1 becomes linearly polarized by polarizer P. The twisted nematic LC layer rotates the polarization axis of the passing light by 90 degrees, so that ideally no light passes through polarizer A. In the ON state, a sufficient voltage is applied between electrodes and a corresponding electrical field E is generated that realigns the LC molecules as shown on the right of the diagram. Here, light L2 can pass through polarizer A. In practice, other schemes of implementation exist with a different structure of the LC molecules - for example without any twist in the OFF state. As both electrodes are on the same substrate, they take more space than TN matrix electrodes. This also reduces contrast and brightness.[17] Super-IPS was later introduced with better response times and colour reproduction.[18]

This pixel layout is found in S-IPS LCDs. A chevron shape is used to widen the viewing cone.


IPS panels display consistent, accurate colour from all viewing angles.[19] A state-of-the-art (2014) comparison of IPS vs. TN panels concerning colour consistency under different viewing angles can be seen on the website of Japan Display
Japan Display
Inc.[20] Unlike TN LCDs, IPS panels do not lighten or show tailing when touched. This is important for touch-screen devices, such as smartphones and tablets.[21] IPS panels offer clear images and stable response time.[17]


IPS panels require up to 15% more power than TN panels.[22] IPS panels are more expensive to produce than TN panels. IPS panels have longer response time than TN panels.

IPS Alternative Technologies[edit]

This section needs expansion. You can help by adding to it. (May 2011)

Plane to Line Switching (PLS)[edit] Towards the end of 2010 Samsung
Electronics introduced Super PLS (Plane-to-Line Switching) with the intent of providing an alternative to the popular IPS technology which is primarily manufactured by LG Display. It is an "IPS-type" panel technology, and is very similar in performance features, specs and characteristics to LG Display's offering. Samsung
adopted PLS panels instead of AMOLED
panels, because in the past AMOLED
panels had difficulties in realizing full HD resolution on mobile devices. PLS technology was Samsung’s wide-viewing angle LCD technology, similar to LG Display’s IPS technology.[23] Samsung
claimed the following benefits of Super PLS (commonly referred to as just "PLS") over IPS:[24]

Further improvement in viewing angle 10 percent increase in brightness Up to 15 percent decrease in production costs Increased image quality Flexible panel

Advanced Hyper-Viewing Angle (AHVA)[edit] In 2012 AU Optronics
AU Optronics
began investment in their own IPS-type technology, dubbed AHVA. This should not be confused with their long standing AMVA technology (which is a VA-type technology). Performance and specs remained very similar to LG Display's IPS and Samsung's PLS offerings. The first 144 Hz compatible IPS-type panels were produced in late 2014 (used first in early 2015) by AUO, beating Samsung
and LG Display
LG Display
to providing high refresh rate IPS-type panels.[25][26] Manufacturers[edit]

LG Display
LG Display
(mentioned as largest supplier of IPS LCDs in 2012)[1] Samsung
Display Sony Professional Display Japan Display
Japan Display
Inc. Panasonic Liquid Crystal Display Co., Ltd AU Optronics Acer

See also[edit]

Computer monitor e-paper LCD TV TFT LCD Smart watch


^ a b Cross, Jason (18 March 2012). "Digital Displays Explained". TechHive. PC World. p. 4. Archived from the original on 2 April 2015. Retrieved 19 March 2015.  ^ "TFT Technology: Enhancing the viewing angle". Riverdi (TFT Module Manufacturer). Archived from the original on 23 April 2016. Retrieved 5 November 2016. However, [twisted nematic] suffers from the phenomenon called gray scale inversion. This means that the display has one viewing side in which the image colors suddenly change after exceeding the specified viewing angle. (see image Inversion Effect)  ^ "Bibliographic data: US3834794 (A) ― 1974-09-10". Espacenet.com. Retrieved 9 October 2013.  ^ U.S. Patent 3,834,794: R. Soref, Liquid crystal
Liquid crystal
electric field sensing measurement and display device, filed 28 June 1973. ^ "Bibliographic data: US5576867 (A) ― 1996-11-19". Espacenet.com. Retrieved 9 October 2013.  ^ US 5576867  patent ^ "2014 SID Honors and Awards". SID informationdisplay.org. Archived from the original on 16 April 2014. Retrieved 4 July 2014.  ^ "Espacenet - Bibliographic data". Worldwide.espacenet.com. 1997-01-28. Retrieved August 15, 2014.  ^ U.S. Patent 5,598,285: K. Kondo, H. Terao, H. Abe, M. Ohta, K. Suzuki, T. Sasaki, G. Kawachi, J. Ohwada, Liquid crystal
Liquid crystal
display device, filed Sep 18, 1992 and Jan 20, 1993. ^ "Optical Patterning" (PDF). Nature. August 22, 1996. Retrieved June 13, 2008.  ^ Technical specifications iPhone 5c Archived 31 October 2013 at the Wayback Machine. ^ Comparison of iPad models Archived 24 October 2012 at the Wayback Machine. ^ Technical specifications Mac Book Pro with Retina display Archived 8 January 2014 at the Wayback Machine. ^ IPS-Pro (Evolving IPS technology) Archived 29 March 2010 at the Wayback Machine. ^ "Archived copy" (PDF). Archived from the original (PDF) on 15 November 2012. Retrieved 24 November 2013.  ^ tech2 News Staff. "LG Announces Super High Resolution AH-IPS Displays". Firstpost.com. Archived from the original on 11 December 2015. Retrieved 10 December 2015.  ^ a b Baker, Simon (30 April 2011). "Panel Technologies: TN Film, MVA, PVA and IPS Explained". Tftcentral.co.uk. Archived from the original on 29 June 2017. Retrieved 13 January 2012. [unreliable source?] ^ "LCD Panel Technology Explained". PChardwarehelp.com. Archived from the original on 14 January 2012. Retrieved 13 January 2012. [unreliable source?] ^ Comparisons done by LG Display
LG Display
Archived 13 January 2013 at the Wayback Machine. ^ Visual comparison of IPS and TN done by Japan Display
Japan Display
Inc. Archived 28 March 2014 at the Wayback Machine. ^ IPS "Stable Panel" Archived 2 May 2015 at the Wayback Machine. ^ Ivankov, Alex (1 September 2016). "Advantages and disadvantages of IPS screen technology". Version Daily. Archived from the original on 26 September 2017. Retrieved 25 September 2017.  ^ " Samsung
Adopts IPS instead of AMOLED: Why?". seoul.co.kr. Archived from the original on 21 December 2012. Retrieved 9 November 2012.  ^ " Samsung
PLS improves on IPS displays like iPad's, costs less". electronista.com. Archived from the original on 27 October 2012. Retrieved 30 October 2012.  ^ " AU Optronics
AU Optronics
develops 144Hz refresh IPS-type display panels". Archived from the original on 17 May 2015.  ^ "144Hz IPS-type Panels Developed - 1440p as Well". Archived from the original on 18 May 2015. 

External links[edit]

Wikimedia Commons has media related to IPS panel.

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