Halla Visteon Climate Control

Yanfeng Visteon

Electronics

Interiors

Our Familyof Businesses

Strictly Private and Confidential

Visteon: Paul Weindorf, Daniel AndresFutaba: Jeff Hatfield

6.1: Automotive OLED Life Test and Prediction

Halla Visteon Climate Control

Yanfeng Visteon

Electronics

Interiors

Our Familyof Businesses

ElectronicsOutline

Introduction

Organic Light Emitting Diode (OLED) display life test description

OLED life test results

Automotive life test prediction

Vacuum Fluorescent (VF) display comparison example

Conclusions

Page 2

Collaborative effort between Visteon and Futaba corporations

ElectronicsIntroductionOLED advantages:

1. Higher contrast ratios2. Superior color and contrast viewing angle performance3. No black background “bleed”4. Better reflection performance5. Substantially better power performance

OLED disadvantage – Differential aging (burned-in image)

Page 3

ElectronicsOLED Life Test Description – Futaba EL427 OLED

Page 4

Futaba EL427 OLED

1. Passive matrix automotive OLED2. Duty – 1/643. Color – White4. Luminance – 300 cd/m2 with circular polarizer5. 4 gray shades

ElectronicsOLED Life Test Description – Initial Measurements

Page 5

A B

CD

E

OLEDID

MeasurementLocation

(drive level)

cd/m2 x y

#1 A (L3 drive) 130.4 0.3027 0.3113

#1 B (L2 drive) 56.91 0.3014 0.3107

#1 C (L1 drive) 1.081 0.3142 0.3072

#1 D (L4 drive) 275.7 0.3022 0.3090

#1 E (all white L4) 269.3 0.2990 0.3070

#1 E (all black L1) 0.002285 0.3931? 0.3111?

#2 A (L3 drive) 132.4 0.3051 0.3134

#2 B (L2 drive) 57.84 0.3039 0.3129

#2 C (L1 drive) 1.103 0.3151 0.3086

#2 D (L4 drive) 284.2 0.3003 0.3103

#2 E (all white L4) 281.0 0.3029 0.3147

#2 E (all black L1) 0.003906 0.3509? 0.3045?

#3 A (L3 drive) 133.2 0.3055 0.3120

#3 B (L2 drive) 58.77 0.3038 0.3123

#3 C (L1 drive) 1.115 0.3160 0.3083

#3 D (L4 drive) 285.2 0.3016 0.3083

#3 E (all white L4) 279.5 0.3002 0.3085

#3 E (all black L1) 0.003346 0.3412 0.3001

ElectronicsOLED Life Test Description - Light Sensor Frame

Page 6

Light Sensor Current to Voltage Converter (Light Sensor and Amplifier)

Osram Light Sensor

System Block Diagram

Light Sensor Frame Assembly

ElectronicsOLED Life Test Results

Page 7

Raw Life Test Data

0

100

200

300

400

500

600

700

800

900

1000

0 5000 10000

Ligh

t Sen

sor A

/D C

ount

s

Hours

Room Temp:1/2Vref

Room Temp:LS4

Room Temp:LS3

Room Temp:LS2

Room Temp:LS1

60C:1/2 Vref

60C:LS4

60C:LS3

60C:LS2

60C:LS1

85C:1/2 Vref

85C:LS4

85C:LS3

85C:LS2

85C:LS1

Visteon (blue circle) versus Futaba Correlation

• Luminance decay rate increases as the operational temperature is increased.

• Very good correlation between Visteon and Futaba life test data.

ElectronicsOLED Life Test Results

Page 8

Drive

Zone

Temp, OLED ID#

Y InitialYFinal

L4

D 25°C, #1

275.7 151.2

L4 All White

D 25°C, #1

269.3 148.5

L3

A 25°C, #1

130.4 98.36

L4 All White

A 25°C, #1

269.3 204.1

L2

B 25°C, #1

56.91 54.13

L4 All White

B 25°C, #1

269.3 254.9

L1

C 25°C, #1

1.081 0.9753

L4 All White

C 25°C, #1

269.3 300.3

L4

D 60°C, #2

284.2 89.78L4 All White D 60°C, #2 281 83.94

L3

A 60°C, #2

132.4 72.69L4 All White A 60°C, #2 281 152.6

L2

B 60°C, #2

57.84 45.64L4 All White B 60°C, #2 281 228

L1

C 60°C, #2

1.103 0.5849L4 All White C 60°C, #2 281 306.2

L4

D 80°C, #3

285.2 26.96

L4 All White

D 80°C, #3

279.5 16.62

L3

A 80°C, #3

133.2 33.69

L4 All White

A 80°C, #3

279.5 57.79

L2

B 80°C, #3

58.77 33.06

L4 All White

B 80°C, #3

279.5 177.3

L1

C 80°C, #3

1.115 0.3836

L4 All White

C 80°C, #3

279.5 295.6

Final OLED Data after Life Test

0

50

100

150

200

250

300

350

L4

(2

5°C)

L4 W

hite

(25°

C)L3

(25°

C)L3

Whi

te (2

5°C)

L2

(2

5°C)

L2 W

hite

(25°

C)L1

(25°

C)L1

Whi

te (2

5°C)

L4

(6

0°C)

L4 W

hite

(60°

C)L3

(60°

C)L3

Whi

te (6

0°C)

L2

(6

0°C)

L2 W

hite

(60°

C)L1

(60°

C)L1

Whi

te (6

0°C)

L4

(8

5°C)

L4 W

hite

(85°

C)L3

(85°

C)L3

Whi

te (8

5°C)

L2

(8

5°C)

L2 W

hite

(85°

C)L1

(85°

C)L1

Whi

te (8

5°C)

Lum

inan

ce (c

d/m

^2)

Y Initial

Y Final

Futaba Shelf Life Data

ElectronicsOLED Life Test Results - Color

Page 9

Drive (Zone,Temp,ID#) x Initial y Initial

x Final

y Final

L4 (D,25°C,#1) 0.3022 0.309 0.3313 0.3255L4 All White(D,25°C,#1) 0.299 0.307 0.3287 0.3237

L3 (A,25°C,#1) 0.3027 0.3113 0.318 0.3197L4 All White (A,25°C,#1) 0.299 0.307 0.3141 0.3173

L2 (B,25°C,#1) 0.3014 0.3107 0.3102 0.3159L4 All White(B,25°C,#1) 0.299 0.307 0.3115 0.3146

L1 (C,25°C,#1) 0.3142 0.3072 0.2934 0.2935L4 All White(C,25°C,#1) 0.299 0.307 0.3052 0.3119

L4 (D,60°C,#2) 0.3003 0.3103 0.3681 0.3439L4 All White(D,60°C,#2) 0.3029 0.3147 0.3648 0.3419

L3 (A,60°C,#2) 0.3051 0.3134 0.3444 0.3316L4 All White(A,60°C,#2) 0.3029 0.3147 0.3436 0.3307

L2 (B,60°C,#2) 0.3039 0.3129 0.3262 0.3236L4 All White(B,60°C,#2) 0.3029 0.3147 0.3282 0.3255

L1 (C,60°C,#2) 0.3151 0.3086 0.3088 0.3029L4 All White(C,60°C,#2) 0.3029 0.3147 0.3138 0.3174

L4 (D,85°C,#3) 0.3016 0.3083 0.4548 0.3846L4 All White(D,85°C,#3) 0.3002 0.3085 0.4469 0.3792

L3 (A,85°C,#3) 0.3055 0.312 0.3945 0.3531L4 All White(A,85°C,#3) 0.3002 0.3085 0.3924 0.352

L2 (B,85°C,#3) 0.3038 0.3123 0.3487 0.3324L4 All White(B,85°C,#3) 0.3002 0.3085 0.3491 0.3319

L1 (C,85°C,#3) 0.316 0.3083 0.406 0.3465L4 All White(C,85°C,#3) 0.3002 0.3085 0.329 0.3239

0.20.220.240.260.28

0.30.320.340.360.38

0.4

0.2 0.3 0.4 0.5

y

x

y Initial

y Final

ElectronicsAutomotive Life Prediction – Consumption Rates

Page 10

0

100

200

300

400

500

600

700

800

900

1000

0 2000 4000 6000 8000 10000

Ligh

t Sen

sor A

/D C

ount

s

Hours

Room Temp:LS4

Room Temp:LS3

Room Temp:LS2

60C:LS4

60C:LS3

60C:LS2

85C:LS4

85C:LS3

85C:LS2

LS4 25C Predict

LS4 60C Predict

LS4 85C Predict

LS3 25C Predict

LS3 60C Predict

LS3 85C Predict

hourcounts

KCC

CR op

5.10751042.61.0

310max

2

hournits

KLL

CR op

5.10751042.61.0

310max

2

Consumption Rate Formulas

hournits

eLL

CRt

op

1076403181042.6

1.03

15.010max

2

Cop= operating A/D countCmax= maximum display A/D count

Lop= operating luminanceLmax= maximum display luminance

hourcounts

eCC

CRt

op

1076403181042.6

1.03

15.010max

2

Add exponential temperature decay

• Exponential temperature decay• 85°C hot start• 45°C steady state• 0.15 hours time constant

ElectronicsAutomotive Life Prediction - Luminance Degradation

Page 11

dtCRLDt

0

tfLL

CR op max

2

1076403181042.6

1.03

15.010

te

tf

TCt

S effftf

0

TCt

S etf 44 1001.21008.1

0

0.00005

0.0001

0.00015

0.0002

0.00025

0.0003

0.00035

0 0.5 1

f(t)

Hours

f(t)fs(t)

Luminance degradation is the integral of consumption Rate

TC=0.1Curve Fit fS(t) versus f(t)

t t t

Sop

Sop dttf

CC

dttfCC

CRdtLD0 0 0max

2

max

2

nitsetLDt

1.010056.00301.0

• Each hot start from +85°C consumes 0.0056 nits of luminance

• Each steady state hour of operation at 45°C consumes 0.0301 nits of luminance

ElectronicsAutomotive Life Prediction – Example 1

Page 12

Condition Luminance Decrease

Notes

3650 +85°C hot starts

20.44 nits 20.44=3650x.0056

2500 hours @ 280 nits day time operation

75.46 nits 75.46=2500x0.030184

2500 hours @ 40 nits night time operation

1.54 nits 1.54=2500x0.000616

Total luminance decrease @ end of life

97.44 nits 34.8% decrease from the initial 280 nits

• 10 years at 15K miles/year (150K miles total)• Average speed of 30 mph• 5000 hours total number of operational hours• 3650 hot (85°C) summer starts (2 hot starts/summer day)• 45°C steady state operation

Condition

Luminance Decreasecd/m2 Notes

3650 +85° hot starts 1.08 1.08=3650x0.000295

2500 hours @ 300 nits day time operation 9.13 9.13=2500x0.003653

2500 hours @ 40 nits night time operation 1.22

1.22=2500x0.001461x40/300

Total luminance decrease @ end of life 11.43

3.81% decrease from initial 300 nits

VF Display Automotive Life ExampleOLED Display Automotive Example

ElectronicsAutomotive Life Prediction – Example 2

Page 13

Condition Luminance Decrease

Notes

3650 +85°C hot starts

19.345 nits 19.345=3650x.0053

2500 hours @ 280 nits day time operation

52.5 nits 52.5=2500x0.021

2500 hours @ 40 nits night time operation

1.05 nits 1.05=2500x0.00042

Total luminance decrease @ end of life

72.9 nits 26% decrease from the initial 280 nits

• 10 years at 15K miles/year (150K miles total)• Average speed of 30 mph• 5000 hours total number of operational hours• 3650 hot (85°C) summer starts (2 hot starts/summer day)• 25°C steady state operation

ElectronicsConclusions

Futaba OLED displays operated successfully for 10,000 hours at 25°C, 60°C & 85°C.

Prediction method using life test data was developed to predict the aging performance for a worst case automotive life cycle.

Most of the OLED display luminance degradation is a result of daytime steady state operation and not due to hot starts or high temperature storage.

The aging prediction indicates that the Futaba OLED display image burn-in performance is worse than matrix type VF displays.

It is expected that the Futaba OLED display may be successfully utilized for automotive applications with appropriate counter measures.

Page 14