How do TN and IPS LCDs produce grays?

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In summary, the conversation discusses the functioning of TN and IPS cells in liquid crystal displays. It mentions the possibility of different sections of the cells completing a 90 degree turn, as well as the use of PWM control to create the appearance of gray to the human eye. However, there is uncertainty about the specific angles and variations in brightness."
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SIM677
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I have the general idea of how these work when they're on or off, but I'm less clear about what's going on when they're only receiving partial voltages on the level of the liquid crystals.

For a TN cell, are some sections completing the 90 degree turn while others have crystals oriented to be perpendicular to the screen? For an IPS cell, are the liquid crystals being angled at say 30, 60 or 80 degrees on their way to 90 degrees? Or is there variation and it all just averages out to a decreased brightness?
 
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  • #2
I'm not sure about this particular application, but many use PWM control to make it APPEAR gray to the human eye by turning on and off very quickly.

Anyhow, Welcome to PF, and maybe someone else will have specific information :)
 

FAQ: How do TN and IPS LCDs produce grays?

How do TN and IPS LCDs produce different shades of gray?

Both TN and IPS LCDs use a combination of liquid crystals and polarized light to produce different shades of gray. However, TN LCDs have a limited viewing angle and can only display a narrow range of gray shades, while IPS LCDs have a wider viewing angle and can display a larger range of gray shades.

What is the difference between the gray production of TN and IPS LCDs?

The main difference between TN and IPS LCDs in terms of gray production is the alignment of liquid crystals. TN LCDs use twisted nematic liquid crystals which are aligned in a specific way to produce different shades of gray, while IPS LCDs use in-plane switching liquid crystals which allow for a wider range of gray shades due to their ability to rotate freely.

How does the refresh rate affect the production of grays in TN and IPS LCDs?

The refresh rate, which is the number of times the screen is updated per second, can affect the production of grays in TN and IPS LCDs. A higher refresh rate can result in smoother transitions between gray shades, while a lower refresh rate may cause flickering or less precise gray production.

Can the user adjust the gray production on TN and IPS LCDs?

Yes, the user can adjust the gray production on both TN and IPS LCDs through the display settings. However, the range of gray shades that can be displayed may be limited by the capabilities of the specific LCD technology.

Are there any other factors that can affect the production of grays on TN and IPS LCDs?

Aside from the type of liquid crystals and refresh rate, other factors such as the quality of the backlight, color gamut, and calibration can also affect the production of grays on TN and IPS LCDs. It is important to properly calibrate and adjust these settings for optimal gray production.

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