How do TN and IPS LCDs produce grays?

  • Thread starter Thread starter SIM677
  • Start date Start date
AI Thread Summary
TN and IPS LCDs produce grays by manipulating the orientation of liquid crystals in response to varying voltage levels. In TN panels, some crystals may rotate 90 degrees while others remain perpendicular, creating a mix of light transmission. IPS panels allow for a range of angles, such as 30, 60, or 80 degrees, contributing to a smoother gradient of gray tones. Pulse Width Modulation (PWM) is often employed to simulate gray by rapidly switching the display on and off, affecting perceived brightness. Understanding these mechanisms is crucial for optimizing display performance and visual quality.
SIM677
Messages
3
Reaction score
0
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?
 
Engineering news on Phys.org
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 :)
 

Thread '3-terminal device external modeling'

Very basic question. Consider a 3-terminal device with terminals say A,B,C. Kirchhoff Current Law (KCL) and Kirchhoff Voltage Law (KVL) establish two relationships between the 3 currents entering the terminals and the 3 terminal's voltage pairs respectively. So we have 2 equations in 6 unknowns. To proceed further we need two more (independent) equations in order to solve the circuit the 3-terminal device is connected to (basically one treats such a device as an unbalanced two-port...
View full post »
Thread 'Weird near-field phenomenon I get in my EM simulation'

Thread 'Weird near-field phenomenon I get in my EM simulation'

I recently made a basic simulation of wire antennas and I am not sure if the near field in my simulation is modeled correctly. One of the things that worry me is the fact that sometimes I see in my simulation "movements" in the near field that seems to be faster than the speed of wave propagation I defined (the speed of light in the simulation). Specifically I see "nodes" of low amplitude in the E field that are quickly "emitted" from the antenna and then slow down as they approach the far...
View full post »

Similar threads

A How Does MWI explain Type I PDC Photon Polarization Entanglement?
Replies
19
Views
205
PDLC film or glass for optical shutters or shutter glasses
Replies
20
Views
5K
MHB Differential Equations of Calculus Problems- Calc I course
Replies
4
Views
3K
Understanding Visual Displays: CRTs, LCDs, and Beyond - A Comprehensive Guide
Replies
2
Views
2K
Studying Help How do I raise my GPA? I have a full schedule with hard classes
Replies
9
Views
3K
Is my fictional Solar System stable and realistic?
Replies
21
Views
4K
Birefringence and Automotive Window Tinting
Replies
9
Views
8K
How Does Great Lakes Earth's Geography Differ from Our Own?
Replies
2
Views
4K
Writing: Input Wanted What Makes Great Lakes Earth So Geographically Unique?
Replies
6
Views
3K
Mathematica This Week's Finds in Mathematical Physics (Week 231)
Replies
5
Views
3K

Hot Threads

Recent Insights

Back
Top