Datasheet
DEM 320240M TMH-PW-N Production Specification
Version: 1.1 PAGE: 6
6. ELECTRO-OPTICAL CHARACTERISTICS
Note1.Definition of contrast ratio
Contrast Ratio(CR) is defined mathematically by the following formula. For more information see FIG.2
Average Surface Luminance with all white pixels (P1, P2, P3, P4, P5,P6,P7,P8,P9)
Average Surface Luminance with all black pixels (P1, P2, P3, P4, P5,P6,P7,P8,P9)
Note2.Definition of surface luminance
Surface luminance is the LCD surface from the surface with all pixels displaying white. For more information
see FIG.2
Lv = Average Surface Luminance with all white pixels(P1, P2, P3, P4, P5,P6,P7,P8,P9)
Note3.Definiton of luminance uniformity
The luminance uniformity in surface luminance （d WHITE） is determined by measuring luminance at each
test position 1 through 9, and then dividing the maximum luminance of 9 points luminance by minimum
luminance of 9 points luminance. For more information see FIG.2
Minimum Surface Luminance with all white pixels (P1, P2, P3, P4, P5,P6,P7,P8,P9)
Maximum Surface Luminance with all white pixels (P1, P2, P3, P4, P5,P6,P7,P8,P9)
Note4. Definition of response time
The response time is defined as the LCD optical switching time interval between “White” state and
“Black”state.Rise time (T
ON
) is the time between photo detector output intensity changed from 90% to 10%.
And fall time (T
OFF
) is the time between photo detector output intensity changed from 10% to 90%.For
additional information see FIG1.
Note5. Definition of color chromaticity (CIE1931)
CIE (x, y) chromaticity ,The x,y value is determined by screen active area center position P5,For more
information see FIG.2
Note6. Definition of viewing ange
Viewing angle is the angle at which the contrast ratio is greater than 10. 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.3
For Viewing angle and response time testing, the testing data is base on Autronic-Melchers’s ConoScope or
DMS series Instruments or compatible. For contrast ratio, Surface Luminance, Luminance uniformity and
CIE,the testing data is base on TOPCON’s BM-5or BM-7 photo detector or compatible.
Note: For TFT module, Gray scale reverse occurs in the direction of panel viewing angle.
Item Symbol Condition Min Typ Max Unit Remark Note
Response Time
Tr+ Tf
-
- 25 50 ms FIG.1 Note 4
Contrast Ratio
Cr
400 500 - - FIG.2 Note 1
Surface
Luminance
Lv
θ=0°
400 450 - cd/m2 FIG.2 Note 2
Luminance
Uniformity
-
θ=0°
60 75 - % FIG.2 Note 3
NTSC -
θ=0°
- 50 - % FIG.2 Note 5
Viewing Angle
Range
q
Æ = 90°
- 60 - deg FIG.3
Note 6
Æ
= 270
°
- 50 - deg FIG.3
Æ = 0°
- 60 - deg FIG.3
Æ = 180°
- 60 - deg FIG.3
CIE (x, y)
Chromaticity
Red x
θ=0°
Æ=0°
Ta=25℃
0.578 0.618 0.658 -
FIG.2
CIE1931
Note 5
Red y 0.277 0.317 0.358
-
Green x 0.260 0.300 0.340
-
Green y 0.524 0.564 0.604
-
Blue x 0.098 0.138 0.178
-
Blue y 0.119 0.159 0.199
-
White x 0.260 0.300 0.340
-
White y 0.316 0.356 0.396
-
Contrast Ratio =
Yu=