GENERAL IMPLICATIONS OF HUD SYSTEMS APPLIED TO AUTOMOBILE INDUSTRIES

José Alejandro Betancur Ramírez

Applied Optics Group, Logical and Computation Group, Engineering Physics Program

Research Group on Designing Engineering, Product Design Engineering

Universidad EAFIT, Medellín, Colombia

jbetan30@eafit.edu.co

Table of Content

1. Introduction

3. Key considerations

4. Development of the problem

Sequential generating image

Schematic operation of the proposed HUD

7. Conclusions

5. Results

Image visualized by the user

6. Future work

8. References

2. Start point

Head Up Display (HUD) applied as a automobile technology.

Recognition of the main optical parameters.

Comprehension of how all those parameters are related with the

human perception.Automobileapplication

Objectives

Optical system

Surrounding conditions

Automobile Industrial considerations

1. INTRODUCTION

Source:http://www.fiatmio.cc/en/discussoes/

Aeronautical application

Source:http://http://en.wikipedia.org/wiki/Head-up_display

Constant Value

A 50 cm

B 68 cm

θ 100°θ´ 10°

Constant Value

C 56 cm

D 21 cm

E 29 cm

F 55 cm

α 31,18°

RENAULT LOGAN 2009

The inclination angle of the

windshield in the region

corresponding to the

observer’s visual range is

considered.

2. START POINT

Constant Value

G 33.00 cm

H 23.17 cm

I 27.034 cm

J 4.03 cm

Z= K+LX+MY+NX2+ÑXY+OY2+PX3+QX2Y+RXY2+SY3

Coefficient Zone 1 Zone 2

K 5.96479 e18 1.33347 e19

L 1.70748 e21 3.21931 e21

M 2.49693 e20 3.53934 e21

N 5.11856 e23 9.61482 e23

Ñ 7.07792 e22 8.50101 e23

O 1.51089 e22 1.12036 e24

P 1.58079 e26 3.07009 e26

Q 2.11232 e25 2.61768 e26

R 4.42634 e24 2.73125 e26

S 1.00520 e24 3.79362 e26

There are two non punctual

zones where the user focuses

his/her attention depending on

the location of the object that

is being observed.

[T]m*n . [U]n =[V]m

([T]m*n)T .[T]m*n.[U]n =([T]m*n)

T.[V]m (3)

The next third order equation

provides enough information

to observe the distortions

suffered by the images when

projected on such zones.

2. START POINT

3. KEY CONSIDERATIONS

Distortion that the image

suffers is minimum on the

area of the left end where the

projected net starts to deform

General schematic operation of conventional HUD.

General schematic operation of the proposed HUD.

A particular functioning

architecture was set up

4. DEVELOPMENT

OF THE PROBLEM

3. KEY CONSIDERATIONS

Constant Value

L1 5468.37mm

L2 850mm

L3 7.3mm

L4 1.2mm

L5 160mm

L6 -176.80mm

L7 6158.37mm

L8 42.76mm

L9 470.43mm

L10 70mm

L11 150mm

L12 673.19mm

F(focal distance) 513.19mm

Mt 12

IFOV 12.7°TFOV 8.5°

FOV Factor 1.5

Diffuser 70mm*70mm

π 78°β ~1°Φ 0.08°

4. DEVELOPMENT

OF THE PROBLEM

4. DEVELOPMENT

OF THE PROBLEM

Type of information Description

Mode 1: Basic information

Speed information

Revolutions per minute In case it is motorized (inner combustion

engine).

Mode 2: Complementary information related with Mode 1

Charge level In case it is motorized (electric engine).

Fuel level

Mode 2: Additional information (positioning)

Location

Covered distance on a trip

Total covered distance

Mode 2: Additional information (inner systems)

Estate on functioning systems

Water level

Water temperature

Oil level

Mode 2: Additional information (Alarms)

Revolution alerts

Excess speed alerts

Proximity alert

Collision alert

Mode 2: Information manipulated by the user

Time

Image size as seen by the user

Image glow as seen by the user

Speed measuring unit

Distance measuring unit

Quantity of alert signs

Movement of certain figures Velocity in the movement of animated

reticules.

it is clear that there arevariables such as time, speed,fuel level, among others, thatareof common interest.

4. DEVELOPMENT

OF THE PROBLEM

1.Windshield holder: allows

the rotation of the

windshield in two of its

three degrees of freedom.

2.Windshield:

corresponding to a

RENAULT LOGAN

reference

G000463620_V02_01.

3. Space for the projection

system: for this analysis we

used as emissive display an

OPUS MICROSYSTEMS

® pico-projector.

4. Location of the observer.

5. RESULTS

Requirement

Object distance of the system’s first lens

(So1)

Image distance of the system’s first lens

(Si1)

Object distance of the system’s second lens

(So2)

Image distance of the system’s second lens

(Si2)

Longitudinal augmentation (M)

Distance between the system’s lenses (D)

Entrance pupil (En.P.)

Exit pupil (Ex.P.)

Diaphragm of aperture (D.A.)

User distance (U.D.)

The exit’s pupil diameter (D1)

Image size generated by the optical system

(D2)

User distance from the exit pupil (U.D.1)

User distance from the generated image

(U.D.2)

Vertical visual range from the generated

image (FOV-θ)

Vertical visual range generated by the exit

pupil (FOV-α)

Paameter Value

So1 249 mm

F1 135 mm

D 400 mm

F2 110 mm

Si2 2375.4 mm

M 8,7

P.S. 151 mm

D1 41,525 mm

D2 261 mm

D.U. 551 mm

D.U.1 551 mm

D.U.2 2926,4 mm

FOV-θ 2,35°FOV-α 2,96°

5. RESULTS

Requirements Value

Chromatic aberration 0

Astigmatism aberration ≤ 0.25 Dpt

Distortion aberration ≤ 1.5 %

Vertical binocular parallax 0

Double refraction 0

Accommodation ≤ 0.25 Dpt

Deformity 0

Daylight luminescence ≤ 9000 ft-L

Night luminescence ≥ 3639 ft-L

6. FUTURE WORK

5. RESULTS

1. It is necessary to debug and to classify this information, mainly based in

the requirements of the image observed by the user, the parameters that are

not controlled and that are tolerable by the user and the quality and the

quantity of the components used for the construction of the HUD.

7. CONCLUSIONS

2. Whereas these systems have many applications and design parameters

discussed herein, It is concluded that these systems vary their design

parameters according to the qualities of the system where you plan to

deploy.

3. It is concluded that the effectiveness of these types of systems, in terms

of the aberrations of the image projected by the combiner to the user is

determined by the quality of the optical elements, and optical system

adopted.

[1]. Robert B. Wood, Mark A. Thomas, Lake Oswego, Jhon P. Desmond, All of Oreg.

“Automobile Head-Up Display system with reflective aspheric surface”, United States of

America Patent, number of patent 4.961.625, date of patent (1990).

[2]. Glenn E. Freeman “Windshield for Head-Up Display system”, United States of

America Patent, number of patent 5.812.332, date of patent (1998).

[3]. Book: Hecht, Zajac [Optic], Addison Wesley Publishing CO, (2005).

[4]. Book: Mordekhai Velger, [Helmet-Mounted Displays and Sights], Artech House,

Boston-London, (1997).

[5]. Yoshiyuki Suzuki, Tatsumi Ohtsuka, Akihisa kasahara, Noriyasu Tomiyama, all of

Japan "On vehicle head up display with optical means for correcting parallax in a vertical

direction", United states Patent, Number of patent: 4.787.711, date of patent (1988).

[6]. Luis Sampedro Díaz “Optical aberrations in Head-Up Displays”, Universidad

Pontificia Comillas Madrid, September 2005.

[7]. Betancur, J. A., "HUD analysis using MAPLE" in Head- and Helmet-Mounted

Displays XV: Design and Applications, edited by Peter L. Marasco, Paul R. Havig,

Proceedings of SPIE Vol. 7688 (SPIE, Bellingham, WA 2010) 76880J.

8. REFERENCES

Special thanks to professors Luciano Ángel Toro, Daniel Velásquez and

Gilberto Osorio.

9. ACKNOWLEDGE