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Google Nexus One

Motorola Droid

Comments

Overall Assessment

Unfinished Prototype

Eventually Good

Excellent Display

DisplayMate Award

The Motorola Droid LCD display is the finest mobile

display we have tested. The Nexus One display still

needs a lot of work to deliver a high quality picture

Display Resolution

800 x 480 pixels

854 x 480 pixels

Both displays have comparable screen pixels

Total Number of Sub-Pixels

0.77 Million

Less Sharp

1.23 Million

Sharp

The Nexus One has only 2 sub-pixels per pixel

instead of the 3 used in most other displays

Displayed Color Depth

16-bits on-screen

Browser and Gallery

Full 24-bits

Browser and Gallery

16-bits produces false contouring and

green-magenta tinted gray scales

Image Scaling to Fit the Screen

Poor for Browser

Poor for Gallery

Poor for Browser

Excellent for Gallery

Rates freedom from scaling artifacts and noise

The Android Browser does this poorly

Viewing Tests

Gaudy Images

Photos and Videos

have too much color

and too much contrast

Excellent Images

Photos and Videos

have accurate color

and accurate contrast

The Viewing Tests examined the accuracy of

photographic images by comparing the displays

to a calibrated studio monitor.

Overall Factory Calibration

Poor

Very Good

Rates color and gray scale tracking and accuracy

Poor means RGB primaries irregularly balanced

Maximum Brightness

or Peak Luminance

229 cd/m²

Relatively Low

449 cd/m²

Excellent

Very important for a mobile device

because of the typically high ambient light

Black Level Brightness

or Black Luminance

0.0035 cd/m²

Outstanding

0.165 cd/m²

Good for Mobile

Only important only for low ambient light,

which is seldom the case for mobile devices

Contrast Ratio

for Low Ambient Light

65,415

Outstanding

1,436 Very Good

Dynamic 2,721

Only relevant for low ambient light,

which is seldom the case for mobile devices

Don’t confuse these values with inflated specs

Screen Reflectance

of Ambient Light

15.5 percent

Relatively High

12.1 percent

Average

The most important spec for a mobile display

because of the typically high ambient light.

Nexus One reflects 28 percent more than the Droid

Contrast Rating

for High Ambient Light

15

Very Low

37

Very Good

This Contrast is very important for a mobile device

because of the typically high ambient light

Dynamic Color and Contrast

Yes

Yes

Best picture quality and accuracy is with No

Should be an option to turn on and off

Color Temperature

8870 degrees Kelvin

Too Blue

6752 degrees Kelvin

Close to D6500

D6500 is the standard for most content and

necessary for accurate color reproduction

White Point Chromaticity

u’=0.1871 v’=0.4508

u’=01946. v’=0.4680

CIE 1976 Uniform Chromaticity Coordinates

Color Gamut

Poor - Too Large

See Figure 1

Excellent

See Figure 1

sRGB / Rec.709 is the standard for most content

necessary for accurate color reproduction

Color Saturation

Too High

Excellent

On the Droid the colors in images, photos and

videos are accurately reproduced

Intensity Scale and Image Contrast

Mostly Too High

and Very Irregular

Very Good

The Intensity Scale controls image contrast needed

for accurate image reproduction. See Figure 2

Gamma for Intensity Scale

1.82 to 2.55

Very Irregular

2.24

Close to Standard

Gamma of 2.2 is the standard and needed for

accurate image reproduction. See Figure 2

Brightness Decrease

with 30 degree Viewing Angle

28 percent decrease

to 166 cd/m²

Large for OLED

64 percent decrease

to 160 cd/m²

Very Large

Screens become less bright when tilted

Both displays are equally bright at 30 degrees

Droid behavior is typical for LCDs

Black Level Increase

with 30 degree Viewing Angle

Visually Insignificant

Not Measured

88 percent increase

to 0.31 cd/m²

An increase contributes to image wash-out

Droid behavior is typical for LCDs

Contrast Ratio

with 30 degree Viewing Angle

Extremely High

Not Measured

280 is Low

Dynamic 516

A measure of screen readability when tilted

Droid is still fine for text but images affected more

Color Shift

with 30 degree Viewing Angle

Δ(u’v’) = 0.0262

7 times JNCD

Δ(u’v’) = 0.0020

½ times JNCD

JNCD is a Just Noticeable Color Difference

Droid has no noticeable color shift with angle

Power Consumption

at Maximum Brightness

0.91 watts

0.87 watts

Both about 1 watt

Power Consumption for the

same Peak Luminance 229 cd/m²

0.91 watts

0.54 watts

LCD with LED backlight is more efficient

Power Consumption for Black

0 watts

0.46 watts

OLED is zero because it is emissive

Droid Dynamic Contrast reduces power for Black