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# Structure of Liquid Crystal Display

IP.com Disclosure Number: IPCOM000121936D
Original Publication Date: 1991-Oct-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 2 page(s) / 49K

IBM

## Related People

Suzuki, M: AUTHOR [+1]

## Abstract

Disclosed is a structure of a transmissive Liquid Crystal Display which consists of two glass substrates with two polarizer sheets, an acrylic transparent sheet for anti-glare purpose, and an acrylic translucent sheet for backlight diffuser, as shown in the figure.

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Structure of Liquid Crystal Display

Disclosed is a structure of a transmissive Liquid Crystal
Display which consists of two glass substrates with two polarizer
sheets, an acrylic transparent sheet for anti-glare purpose, and an
acrylic translucent sheet for backlight diffuser, as shown in the
figure.

In theoretical world, when a light goes from one material into
another material, any pair of two materials which has different
refractive indexes makes a small quantity of reflection of the light
even if the light penetrates into other material perpendicularly.
The ratio of the reflection is shown as following formula.
Reflection (%) = ((n1-n2)/(n1+n2))**2
where n1, n2 are the refractive indexs of the each material.

When we adopt this formula into one example of a Liquid Crystal
Display, we get following value.
Translucent diffuser sheet (n=1.49) ----> Air(n=1.00) 3.87%
Air ----> Lower polarizer (n=1.48) 3.75%
Upper polarizer (n=1.48) ----> Air 3.75%
Air ----> Transparent anti-glare sheet (n=1.49) 3.87%
Total 15.24%

We can easily understand that 15.24% of incident light is lost
by the reflection.  To minimize this reflection, a certain material
which has a refractive index value nearly equal to that of the
diffuser sheet, the anti-glare sheet, and the polarizer should be
replaced with air.

In this disclosure, we use silicone oil whose refractive index
value is 1.40. ...