Data Sheet

RiTFT-35 series

LCD TFT Datasheet Rev.1.0

Note 1. Contrast Ratio(CR) is defined mathematically as below, for more information see Figure .

Contrast Ratio =

Average Surface Luminance with all white pixels (P1, P2, P3, P4, P5)

Average Surface Luminance with all black pixels (P1, P2, P3, P4, P5)

Note 2. Surface luminance is the LCD surface from the surface with all pixels displaying white. For more

information, see Figure .

Lv = Average Surface Luminance with all white pixels (P1, P2, P3, P4, P5)

Note 3. The uniformity in surface luminance δ WHITE is determined by measuring luminance at each

test position 1 through 5, and then dividing the maximum luminance of 5 points luminance by

minimum luminance of 5 points luminance. For more information, see Figure .

δ WHITE =

Minimum Surface Luminance with all white pixels (P1, P2, P3, P4, P5)

Maximum Surface Luminance with all white pixels (P1, P2, P3, P4, P5)

Note 4. Response time is the time required for the display to transition from white to black (Rise Time,

Tr) and from black to white (Decay Time, Tf). For additional information see FIG 1. The test equipment

is Autronic-Melchers’s ConoScope series.

Note 5. CIE (x, y) chromaticity, the x, y value is determined by measuring luminance at each test

position 1 through 5, and then make average value.

Note 6. Viewing angle is the angle at which the contrast ratio is greater than 2. For TFT module 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 Figure .

Note 7. For viewing angle and response time testing, the testing data is based on Autronic-Melchers’s

ConoScope series. Instruments for Contrast Ratio, Surface Luminance, Luminance Uniformity, CIE the

test data is based on TOPCON’s BM-5 photo detector.

Note 8. For TFT module, Gray scale reverse occurs in the direction of panel viewing angle.

Figure 2. The definition of response time