Positive & Negative Display and Viewing Direction of LCD Display

Positive & Negative Display and Viewing Direction of LCD Display

As we know, LCD display which is negative display can’t emit light by its own. It either relies on ambient light or uses LED backlight in the back as light source. We divide LCD display into transmissive LCD, reflective LCD and transflective LCD according to the employing mode of light.   Also, we divide LCD screen into positive display and negative display according to the light of background part is on/off.

item  background graphic/ character application
positive display on

off

reflective LCD /transflective LCD
negative display off

on

transmissive LCD

We can see the Positive and Negative Display diagram below.

LCD screen positive and negative display

View direction is the direction that we can see clear the graphic in the LCD panel. We name it after the hours of the clock, like 12:00 o’clock direction, 3:00 o’clock direction, 6:00 o’clock direction and 9:00 o’clock direction.

LCD screen view angle

It is very simple, but most of people can’t fully understand the meaning.  We already talked about the difference between TN, HTN, STN and FSTN LCD in my past post. The deflection orientation of liquid crystal in TN LCD is 90 degree. Oh my god, what is that? If we see TN, HTN, STN and FSTN LCD in the perspective of view angle, it is much easier for us to understand.

TN LCD only has one view direction. Normally, it would be 6:00 o’clock direction or 12:00 o’clock direction. 6:00 o’clock direction means that we can see it clear from the frontage and 6:00 o’clock direction.  We can still see it clear from 12:00 o’clock direction if we make it well enough even it is 6:00 o’clock direction.  The digital clock displays in a car are installed in the right hand side of the driver, which is usually 9:00 o’clock direction.

The view angle range of HTN LCD is a little better than TN LCD’s. For example: if the view direction of TN LCD is 6:00 o’clock direction, you will see the graphic very blurred in any angle of 3:00 o’clock or 9:00 o’clock direction.  We can still can it clearly within 20 degrees of 3:00 o’clock or 9:00 o’clock direction if it is 6:00 o’clock direction HTN LCD.

Only when it comes to STN LCD, we can see it clear in all the 4 directions.  The view angle of FSTN is much better than STN’s, but it is much expensive, which usually  employs in high-class electronic products , like laptop computers and cellphones.

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