LM240WU8
Liquid Crystal Display
Product Specification
Notes 1. Contrast Ratio(CR) is defined mathematically as : (By PR880)
Surface Luminance with all white pixels
Surface Luminance with allblack pixels
Contrast Ratio =
It is measured at center point(Location P1)
2. Surface luminance(LWH)is luminance value at 5 points average across the LCD surface 50cm from
the surface with all pixels displaying white. For more information see FIG 7. (By PR880)
LWH = = Average[ Lon1,Lon2,Lon3,Lon4,Lon5]
3. The variation in surface luminance , δ WHITE is defined as : (By PR880)
Minimum(LP1,LP2 ,…..LP9)
Maximum (LP1, LP2 ,....LP9)
δWHITE
=
×100
Where L1 to L9 are the luminance with all pixels displaying white at 9 locations.
For more information see FIG 8.
4. Gray to gray response time is the time required for the display to transition from gray to gray. For
additional information see Table 10. (By RD80S)
5. Color shift is the angle at which the average color difference for all Macbeth is lower than 0.02.
For more information see FIG 9. (By EZ Contrast)
- Color difference (∆u’v’)
4x
9y
∆u'v'= (u'1−u'2 )2 + (v'1−v'2 )2
u'=
v'=
− 2x +12y + 3
− 2x +12y + 3
24
u’1, v’1 : u’v’ value at viewing angle direction
u’2, v’2 : u’v’ value at front (θ=0)
i : Macbeth chart number (Define 22 page)
(∆u'v')i
∑
i=1
Avg(∆u'v') =
24
- Pattern size : 25% Box size
- Viewing angle direction of color shift : Horizontal, Vertical
6. 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 10. (By PR880)
7. GSR is the rate of gamma shift at up, down, left and right 60 degree viewing angle compare with
center gamma. For more information see FIG 11 and FIG 12 (By EZ Contrast)
- GSR (δ Gamma ) is defined as :
View angle Gamma Value (Up, Down, Reft, Light 60 Degree)
Center Gamma Value (0 Degree)
GSR = 1−
×100
Ver. 0.0
Apr, 07, 2011
20 / 32
LG [ LG SEMICON CO.,LTD. ]
