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Construction of an IPS panel from leading LCD research company Merck. The liquid crystals are arranged horizontally to the image surface and parallel to each other (Picture: Merck)
IPS technology (In Plane Switching) differs to TN in that the liquid crystals are arranged parallel and not twisted by 90 degrees. When voltage is applied, they arrange themselves in such a way as to prevent light from passing through the polarization filter and the pixel remains black.
Since the electrodes for the creation of the voltage and the turning of the liquid crystals can only be located on the back of an IPS panel due to the way in which it is constructed and the amount of light allowed through is reduced as a result, a stronger backlight is needed. As a result, IPS screens consume more energy than TN models. There is also some loss in terms of contrast.
The different arrangement of the liquid crystals on TN and IPS panels affects the extent of the viewing angles. (Picture: CMO)
This is how the results of IPS and TN technologies look on screen. The picture in the middle was taken when viewed from the front, the other pictures represent side views or views from above and below the monitor respectively. TN panels are especially weak in terms of vertical viewing angles, with image content becoming darker or brighter. (Picture: Hitachi-Displays)
The further development Super-IPS (S-IPS) has improved the contrast, colors, viewing angles and respone time of IPS panels.