automotive oled life test and prediction
TRANSCRIPT
![Page 1: Automotive OLED Life Test and Prediction](https://reader034.vdocuments.us/reader034/viewer/2022042706/58a1cf8b1a28ab9d338b703f/html5/thumbnails/1.jpg)
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
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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
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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
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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
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ElectronicsOLED Life Test Description – Initial Measurements
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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
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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
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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.
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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
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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
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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
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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
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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
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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
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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.
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