Product Specification

LP156WF4

Liquid Crystal Display

Ver. 1.1

Apr. 17, 2014

17 / 39

Note)

1. It should be measured in the center of screen(1 Point). Contrast Ratio(CR) is defined mathematically as

Surface Luminance with all white pixels

Contrast Ratio(1 Point) =

Surface Luminance with all black pixels

2. Surface luminance is the average of 5 point across the LCD surface 50cm from the surface with

all pixels displaying white. For more information see FIG 2.

L

WH

= Average(

1,2, … 5 Point)

3. The variation in surface luminance , The panel total variation (

 WHITE) is determined by measuring N

at each test position 1 through 13 and then defined as following numerical formula.

For more information see FIG 2.

Minimum (1,2, … 5 Point)

Minimum (1,2, … 13 Point)

 WHITE (5P) =

 WHITE (13P) =

Maximum (1,2, … 5 Point)

Maximum (1,2, … 13 Point)

4. Response time is the time required for the display to transition from black to white (rise time, Tr) and

from white to black (falling time, Tf). For additional information see FIG 3.

5. Viewing angle is the angle at which the contrast ratio is greater than 10. The angles are determined

for the horizontal or x axis and the vertical or y axis with respect to the z axis which is normal to the

LCD surface. For more information see FIG 4.

6. Gray scale specification

Gray Level

Luminance [%] (Typ)

L0

0.10

L7

0.72

L15

4.31

L23

12.22

L31

24.19

L39

38.15

L47

54.53

L55

74.32

L63

100