1 Advanced Display Optics Lab Lin-Yao Liao ( 廖凌嶢 )*, Fang-Cheng Lin ( 林芳正 )*, Chun-Ho Chen ( 陳均合 )*,, Gwo-Jenn Wang ( 王國振 )** Advisors: Prof. Han-Ping D. Shieh** ( 謝漢萍 教授 ) Prof. Yi-Pai Huang** ( 黃乙白 助理教授 ) 1 Institute of Electro-Optical Engineering 光電工程研究所 2 Display Institute 顯示科技研究所 National Chiao Tung University 國立交通大學 Jan. 15 th, 2008 HDR month report

2 Advanced Display Optics Lab Outline  Introduction - What’s motion blur phenomena - The prior arts  Concepts  Simulations  Future works

3 Advanced Display Optics Lab Outline  Introduction - What’s motion blur phenomena - The prior arts  Concepts  Simulations  Future works

4 Advanced Display Optics Lab Introduction What causes motion blur ? - Slow liquid crystal response and nature of hold type display - Smooth pursuit results in edge blurring V (pixels/frame)

5 Advanced Display Optics Lab The prior art Blinking backlight, black insertion. Faster LC response, overdrive. Original image Blur image With black insertion Prior art : (black insertion) ~~ SID 02 Daigo Sasaki, etc. Disadvantage: - The image with black insertion is darker than the original image !

6 Advanced Display Optics Lab The prior art Blink backlight Disadvantage : - The brightness is decreased

7 Advanced Display Optics Lab Outline  Introduction - What’s motion blur phenomena - The prior arts  Concepts  Simulations  Future works

8 Advanced Display Optics Lab Conventional : Motion blur on conventional backlight (without LC compensation) t (LC response time) LC response curve BL Final Motion blur time 500 nits 60% 10% 90% time 300 nits Luminance (nits) 1 frame Transmission (%)

9 Advanced Display Optics Lab Motion blur on 2D dimming backlight 2D dimming BL : (with LC compensation) BL Final Motion blur LC response curve 400 nits 100 nits 80% t (LC response time) time 10% 90% time 300 nits Luminance (nits) Transmission (%) 1 frame

10 Advanced Display Optics Lab Outline  Introduction - What’s motion blur phenomena - The prior arts  Concepts  Simulations  Future works

11 Advanced Display Optics Lab Simulation with 2D dimming backlight BL : 8X8 areas (average) LC : compensation 1st frame 2nd frame Brightness Time 12 BL (dim) BL (boost) Gray level BL(dim) BL(boost) Original image Algorithm BL (dim) BL (boost) Final image Backlight (BL) LC compensation BL* Less motion blur

12 Advanced Display Optics Lab Motion picture response time (MPRT) The BEW (brightness edge width) is proportional to the moving speed. N-BEW (frame)=BEW (pixel) / moving speed (pixel/frame) N-BET (ms) = N-BEW x frame rate (seconds/frame) (MPRT) 10% 90% BEW A A A’ Motion picture response curve pixel luminance ~~ SID 04 Youichi Igarashi, etc.

13 Advanced Display Optics Lab B/L control method and simulation--(1) (1) Third power & cube root ( V= 10 pixel/ frame) TypeMPRT Conventional B/L14 ms Dimming B/L11.7 ms

14 Advanced Display Optics Lab B/L control method and simulation--(2) (2) Fifth power & fifth root ( V= 10 pixel/ frame) TypeMPRT Conventional B/L14 ms Dimming B/L10 ms

15 Advanced Display Optics Lab B/L control method and simulation- ---(3) (3) Full black & fifth root TypeMPRT Conventional B/L14 ms Dimming B/L6 ms The motion blur is suppressed.

16 Advanced Display Optics Lab Simulation with common image (a) (c) (d) (e) (f) (g) (b)

17 Advanced Display Optics Lab Outline  Introduction - What’s motion blur phenomena - The prior arts  Concepts  Simulations  Future works

18 Advanced Display Optics Lab Future works Fitting the Look up table(LC response time) - Each gray to gray response curve. Improve the B/L control method - the brightness of some picture are still darker.

19 Advanced Display Optics Lab Thanks for your kind attention

20 Advanced Display Optics Lab Motion picture Simulation system Time Position (pixel) Temporal integration considered a smooth pursuit Eye movement frame 1 Brightness LC response curves between grayscales Time Object velocity : v (pixels/frame) v The formation of a response curve for each pixel

21 Advanced Display Optics Lab Motion blur Third power & cube root B/L

22 Advanced Display Optics Lab Motion blur fifth power & fifth root B/L

23 Advanced Display Optics Lab Motion blur full black & fifth root B/L

24 Advanced Display Optics Lab Simulation of conventional B/L

25 Advanced Display Optics Lab Simulation of blinking B/L

26 Advanced Display Optics Lab Simulation of Third power & cube root B/L

27 Advanced Display Optics Lab Simulation of fifth power & fifth root B/L

28 Advanced Display Optics Lab Simulation of full black & fifth root B/L