ips-Horizontal electric field effect display technology

- Jun 01, 2020-

ips-Horizontal electric field effect display technology

IPS LCD display principle-schematic

 

IPS technology is a display technology developed successfully by Hitachi, Japan in 1996. It is a wide-view LCD technology and is widely used in the manufacture of LCD-TV, which can effectively improve the color difference that appears on the TN screen when the viewing angle is poor And other issues

 

Basic Information

Chinese name

IPS

 

Foreign name

In-Plane Switching

 

Types of

LCD Monitor

 

source

Hitachi

 

time

1996

 

table of Contents

1IPS Technology Brief

2 benefits

3 Disadvantages

Fold and edit this paragraph IPS technology introduction

IPS technology is a display technology developed successfully by Hitachi, Japan in 1996. It is a wide-view LCD technology and is widely used in the manufacture of LCD-TV, which can effectively improve the color difference that appears on the TN screen when the viewing angle is poor And other issues. Display principle

 

Both the IPS type and the TN type use nematic liquid crystals. The difference between the two is that the electric field applied to the liquid crystal molecules is different:

 

The TN type electrode is on the two substrates, the direction of the applied electric field is perpendicular to the substrate, and the liquid crystal molecules move parallel and perpendicular to the substrate; the IPS type applies the electric field horizontally, so the liquid crystal molecules are parallel to the substrate During the torsional movement, the liquid crystal molecules without the applied electric field are parallel to the substrate alignment (homogeneous), and the upper and lower polarizers are arranged at a 90-degree cross, which is always vertical. The polarizing axis of the bottom polarizer is the same as that of the liquid crystal molecules. The incident light travels straight through the liquid crystal layers arranged in parallel, does not change the direction of travel, and the emitted light cannot pass through the upper polarizer, so it shows an opaque black state and an electric field is applied. Afterwards, the liquid crystal molecules will twist and birefringence will occur in the liquid crystal layer, which will change the direction of the incident light and pass through the upper polarizing plate, showing a light-transmitting state. When the liquid crystal molecules intersect the substrate for torsional movement without applying an electric field, and when the liquid crystal molecules are arranged at less than the tilt angle, the viewing angle in the black state is increased, resulting in a wider viewing angle for the light-to-dark ratio.

 

Benefits of folding this paragraph

Once the transistor on the display burns out and becomes a dead spot, the dead spot of the general display will become a bright spot, but the IPS display will become a black spot without light. The rigid panel is very suitable as a touch screen. Excellent color performance and viewing angle.

 

Herringbone pixel layout for expanding cone angle

Herringbone pixel layout for expanding cone angle

 

Fold and edit the bad parts of this paragraph

However, better display comes at a price. The cost of IPS technology is a slower response rate, about 50 milliseconds. In addition, the display screen using IPS technology is also very expensive. Therefore, after the IPS was launched in 1996, there have been new developments:

 

In 1998, Hitachi introduced S-IPS (Super-IPS). In addition to the original IPS technology, the response rate was also improved. In 2002, Hitachi launched AS-IPS, which has greatly improved the light-dark ratio.

 

The power consumption is higher than the average screen. Although the viewing angle is increased to 170 degrees, other properties are not improved at all, so it is not worth the money. Compared with VA series panels, the contrast ratio is poor, the performance in black and dark colors is not good, and light leakage is also easy. The reaction speed is slow, and it is easy to have afterimages.