1 | Energy Efficiency and Renewable Energy eere.energy.gov 

## Television Set On Mode Automatic Brightness Control Testing: Effect of Room Conditions February 2013 Department of Energy Energy Efficiency and Renewable Energy2 

## Overview

• DOE performed on mode testing with Automatic Brightness Control (ABC) enabled in 3 different rooms to determine how room physical characteristics may impact power consumption

– DOE explored variation in wall surface, wall color, and room size


### • Room illuminance measured at the ABC sensor while the TV 

### displayed the static IEC main menu • Ensured dark room conditions (i.e., illuminance < 1.0 lux in standby mode ) • Displayed dynamic video content 

### • Measured power consumption3 

## Testing Set- up
• DOE tested the IEC Dynamic Broadcast Content for a duration of 10 minutes at 10, 35, and 50 lux

– Power consumption of TV ABC tends to be most sensitive to changes in illuminance at these values 

### • Room illuminance generated using the Distance test set-up as described in the SNOPR • All testing performed on TV 4 1 

### • Illuminance meter accuracy: ± 2% ± 1 digit

1 TV designation corresponds to those described in the Round Robin Test Report . This material can be found in Docket #EERE- 2010 - BT - TP -0026 at regulations.gov.4 

## Variables

• TV tested with sensor facing different walls within each room to explore impact of wall texture, color and material in the same 

### room • 3 different wall types resulted in 3 different room configurations Room size • Small: 63 ft 2 

### • Medium: 92 ft 2 

### • Large: 256 ft 2 

### Wall texture

• Matte • Glossy Wall color

• White • Beige Wall material

• Glass • Fabric • Paint5 

## Room A (Small)

• Room dimensions – 95” x 95” • Three walls covered in flat white paint

– Blue in the figures on the next slide 

### • One wall covered in beige textured cloth

– Red in the figures on the next slide 

### • Hung a white curtain on the outside of the window allowing the 

### window to act as a reflective surface • TV tested 3 times, facing different walls6 

## Room A: Position 1

Figure not to scale 

### Room A TV Position 17 

## Room A: Position 2

Figure not to scale 

### Room A TV Position 28 

## Room A: Position 3 Room A TV Position 3

Figure not to scale9 

## Room B (Medium)

• Room dimensions – 107’’ x 112’’ x 102’’ x 149’’

– Trapezoidal 

### • Three walls covered in flat white paint

– Blue in the figures on the next slide 

### • One wall covered in beige textured cloth

– Red in the figures on the next slide 

### • Hung a white curtain on the outside of the window allowing the window to act as a reflective surface • TV tested 3 times, facing different walls10 

## Room B: Position 1
Room B TV Position 1

Figure not to scale11 

## Room B: Position 2
Room B TV Position 2

Figure not to scale12 

## Room B: Position 3
Room B TV Position 3

Figure not to scale13 

## Room C (Large)

• Room dimensions – 192’’ x 192’’ • All walls covered in black felt 

### • Room has no windows • Illuminance measured with TV facing only one direction14 

## Room C

Figure not to scale15 

## Results

0 20 40 60 80 100 120 140

10 35 50Average Power (Watts)

Illuminance Value (Lux) Room Condition Comparison

Room A - Position1 Room A - Position 2 Room A - Position 3 Room B - Position 1 Room B - Position 2 Room B - Position 3 Room C16 

## Results
Power Consumption by TV Location (watts) Room A-1 Room

A-2 Room

A-3 Room

B-1 Room

B-2 Room

B-3 Room

C COV Illuminance (Lux) 10 71.6 71.1 70.1 69.3 70.9 70.2 69.6 1.2 %

35 114 113 112 112 111 113 112 0.8 % 50 127 126 127 126 125 126 126 0.6 % CV = Coefficient of Variation which is the standard deviation divided by the mean