How to achieve your optimal image quality goals for head-up displays? Consumers expect clear images!

Transcription

1 How to achieve your optimal image quality goals for head-up displays? Consumers expect clear images!

2 Agenda of today - What is HUD? - HUD PVB Types - HUD Trends - Next generation PVB - Influencers Optics

3 Head up Display (HUD ) To display information in front of the driver - Information - Screen - Projector - Driver

4 Windshield-PVB based HUD To display information - Using the windshield as projection screen - In front of the driver The objective - Allow the driver to remain focused on the road while - Providing the driver information important to the drive

5 Glass PVB Glass 2 screens, 2 images Current PVB types on the market Windshield-PVB based HUD Glass pair laminated with PVB Restricted External use

6 Navigation info and signal warning become part of HUD image Field of View (FOV) Virtual Image Distance (VID) 1) The Field of View (FOV) is getting larger. Multiple image planes are created to separate driver information content (speed and tachometer information) from Augmented Reality (AR) content information (e.g. distance warnings or navigation information at farther virtual image distance) Windscreen HUD FOV Area E A B D C Restricted External use

7 Navigation info and signal warning become part of HUD image Field of View (FOV) Virtual Image Distance (VID) 1) The Field of View (FOV) will also get larger 2) The Virtual Image Distance (VID) becomes farther away from the driver Restricted External use

8 Navigation info and signal warning become part of HUD image Field of View (FOV) Virtual Image Distance (VID) 1) The Field of View (FOV) will also get larger 2) The Virtual Image Distance (VID) becomes farther away from the driver HUD 3.0 HUD 2.0 HUD 1.0 Content: 2D FOV Size: 6 x2 Content: 2D FOV Size: 7 x3 Content: 2D /AR FOV Size: 8 x4 Content: 3D /AR FOV Size: 10 x4 Content: 3D /AR FOV Size: 12 x5 Restricted External use

9 The Problem Images reflected between two sheets of glass creates visual distortion known as ghosting. Single angle wedge PVB helps correct ghosting only for nominal height drivers. This type of PVB is the industry solution today. Good wedge No wedge Under wedge Over wedge

10 The Problem Images reflected between two sheets of glass creates visual distortion known as ghosting. Single angle wedge PVB helps correct ghosting but only for nominal height drivers. This type of PVB is the industry solution today. Short / tall drivers still experience ghosting and may conclude the HUD system is defective and something that can t be fixed. 10

11 Single angle wedge 4 8

12 Single angle wedge 4 8

13 The Short / tall drivers problem can be solved SAFLEX VIEW ST Saflex VIEW ST is based on proprietary multi angle wedge technology to overcome the limitations of single angle wedge interlayers. It improves resolution for short and tall drivers especially for car owners that have highly complex windshields.

14 The Short / tall drivers problem can be solved SAFLEX VIEW ST Saflex VIEW ST multi angle wedge accounts for the different wedge angles required at each position of the windshield to eliminate ghosting. The key to VIEW technology is the ability to shape, or tune, the interlayer so that both projected images at the same focal point Single angle wedge interlayer Saflex VIEW ST multi-angle wedge interlayer

15 The Short / tall drivers problem can be solved SAFLEX VIEW ST Saflex VIEW ST in reality The same windshields produced with standard HUD and VIEW HUD Driver seat rotating between the two windshields Driver switching from standard HUD to VIEW ST HUD Driver seat going from tall driver (down) to short driver (up)

16 The Short / tall drivers problem can be solved Traditional HUD versus SAFLEX VIEW ST (short/tall driver)

17 Influencing the Optics Glass Type Processing PVB Type Processing Driver Short Average - Tall Projector Type Positioning Windshield design Bending, Curvage Installation Angle

18 Influencing the Optics Glass Processing Bending technology is influencing the final shape/quality of the glass pairs Gravity Press Bending Vacuum Press Bending Influences Local glass thickness deviations (initial glass quality bending procedure/quality) Bending gaps, PVB tries to fill the gaps during autoclaving Other glass processing processes

19 Influencing the Optics PVB Processing PVB Preparation Cut To Size Shape/stretch PVB heated/cooled with a temperature difference or gradient along the PVB sheet can lead to optical distortion visible on the final windshield! 30 C difference Restricted External use

20 Influencing the Optics PVB Processing PVB Preparation Cut To Size Shape/stretch Very hot Cold The PVB heated/cooled not performed uniform, can lead to waves and optical distortion The can be visible on the final windshield when projecting images Cold Average Restricted External use

21 Influencing the Optics PVB Processing PVB Preparation Shaping / Stretching PVB processing can influence/change the PVB angle! Controlled process: The change is predictable and always the same. No optical distortion is created if the windshield is properly designed Uncontrolled processing will result in PVB thickness deviations creating optical distortion noticable in the windshield and/or the HUD projected image Restricted External use

22 Questions? Thanks Bart Van Laere