RAMANANDATIRTHA ENGINEERING COLLEGE

DEPARTMENT OF

ELECTRONICS & COMMUNICATION ENGINEERING

A

TECHNICAL SEMINAR REPORT ON

IN PLANE SWITCHING TECHNOLOGY

Under the guidance of

Mrs. K.PRIYANKA , M.tech Presented By

ASSISTANT PROFFESOR K.SRAVYA REDDY 135C1A0442

AIM OF THE PROJECT

• An active backlight control technology and a data-processing algorithm

has been developed to improve the image quality in IPS-mode LCD TVs.

• The image-blinking problem caused by repeatedly abrupt changes in the

backlight luminance was solved by using algorithms [Fba (flexible-

boundary algorithm) and Cfa (cumulative feedback algorithm)] and an

optimized number of backlight dimming steps based on human perception

INTRODUCTION

• In-plane switching is an LCD technology that aligns the liquid crystals in a

plane parallel to the glass substrates.

• In this method, the electrical field is applied through opposite electrodes on

the same glass substrate, so that the liquid crystals canbe reoriented

(switched) essentially in the same plane.

• Currently Panasonic is using an enhanced version e IPS for their large size

LCD-TV products.

IPS TECHNOLOGY

• IPS(In-plane switching) is a screen technology for liquid crystal

displays (LCDs).

• These limitations included strong viewing angle dependence and low-

quality colour 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, essential

IN PLANE SWITCHING MODES

• In-plane switching (IPS) was developed by Hitachi Ltd. in 1996 to

improve on the poor viewing angle and the poor color reproduction of TN

panels at that time.

• Its name comes from the main difference from TN panels, that the

crystal molecules move parallel to the panel plane instead of perpendicular

to itas shown in Figure 1

LIQUID CRYSTAL DISPLAY (LCD)

• LCD (liquid crystal display) is the technology used for displays in

notebook and other smaller computers.

• Like light-emitting diode (LED) and gas-plasma technologies, LCDs

allow displays to be much thinner than cathode ray tube (CRT) technology.

LCDs consume much less power than LED and gas-display displays because

they work on the principle of blocking light rather than emitting it.

LCD IN IPS

• IPS displays are capable of a wider total range of color.

• When current passes through the crystal in an IPS display, the crystal

structure rotates 90 degrees in parallel with the flat plane of the display, rather

than turning vertically from parallel to perpendicular.

CREATING COLOURS IN LCD DISPLAYS

• In order to create the shades required for a full-colour display, there have

to be some intermediate levels of brightness between all-light and no-light

passing through.

• The varying levels of brightness required to create a full-colour display is

achieved by changing the strength of the voltage applied to the crystals.

POLARIZATION IN LCD

•A polarising filter is simply a set of incredibly fine parallel lines.

• These lines act like a net, blocking all light waves apart from those

(coincidentally) orientated parallel to the lines.

• A second polarising filter with lines arranged perpendicular (at 90

degrees) to the first would therefore totally block this already polarised light.

ADVANTAGES

• The IPS panel generates very less heat as compared to other panels which

means less power consumption

• It ensures zero color shift.

• Low power-consumption, green technology

• Wider viewing angle: vertical and horizontal viewing angle of 178 degrees

• High accuracy in color and image quality.

CONCLUSION

• In Plane Switching LCD technology offers a number of important

advantages and related clinical benefits over other LCD technologies. As a

result, IPS has become the dominant system with the largest installed base

of LCDs in medical imaging.

• The recent introduction of the IPS-Pro technology further builds on this

momentum and brings a number of important improvements

Any Queries…….?