US 11,921,379 B2
Process for driving a 2D/3D switchable autostereoscopic display device
Patrick Godefridus Jacobus Maria Peeters, Veldhoven (NL); Hubertus Petrus Cornelis Vankuringen, Veldhoven (NL); Ivar Jacco Boerefijn, Veldhoven (NL); Andrii Ivanovych Rudavskyi, Veldhoven (NL); and Pieter Wilhelmus Theodorus De Jong, Veldhoven (NL)
Assigned to ZHANGJIAGANG KANGDE XIN OPTRONICS MATERIAL CO., LTD., Zhangjiagang (CN)
Appl. No. 17/418,273
Filed by ZHANGJIAGANG KANGDE XIN OPTRONICS MATERIAL CO. LTD, Zhangjiagang (CN)
PCT Filed Dec. 27, 2019, PCT No. PCT/CN2019/129252
§ 371(c)(1), (2) Date Jun. 25, 2021,
PCT Pub. No. WO2020/135731, PCT Pub. Date Jul. 2, 2020.
Claims priority of application No. 2022327 (NL), filed on Dec. 29, 2018.
Prior Publication US 2022/0146890 A1, May 12, 2022
Int. Cl. G02F 1/1337 (2006.01); G02B 30/28 (2020.01); G02F 1/1343 (2006.01); H04N 13/305 (2018.01); H04N 13/359 (2018.01)
CPC G02F 1/133769 (2021.01) [G02B 30/28 (2020.01); G02F 1/134309 (2013.01); H04N 13/305 (2018.05); H04N 13/359 (2018.05)] 18 Claims
OG exemplary drawing
 
1. Switching process for switching in an autostereoscopic display device from a first view mode to a second view mode, wherein the autostereoscopic display device comprises
a display panel having an, array of display pixel elements for producing a display output;
a lenticular device provided over the display panel that is electrically switchable to provide the first view mode or the second view mode, wherein in one of the two view modes the lenticular device comprises lenticular lens areas which direct the output from different display pixel elements to different spatial positions within a field of view of the display device, the lenticular device comprising
a first optically transparent substrate;
an array of lenticular elements provided over the first optically transparent substrate, wherein the lenticular elements have a lenticular surface with liquid crystal alignment properties;
a second optically transparent substrate having a flat surface with liquid crystal alignment properties, the lenticular surface and the flat surface facing each other;
a first planar switching electrode arranged at a side of the first optically transparent substrate;
a second planar switching electrode arranged at a side of the second optically transparent substrate;
a liquid crystalline composition comprising liquid crystal molecules, the composition being sandwiched between the two substrates, wherein in the first view mode, the liquid crystal molecules are lying in the plane of the switching electrodes and in the direction of the lenticular elements, and wherein in the second view mode, the liquid crystal molecules are oriented normal to the two planar switching electrodes;
means for applying a voltage at defined magnitudes across both switching electrodes to control the switching from the first view mode to the second view mode;
the process comprising the application of a switching voltage across both switching electrodes when the lenticular device is in its first view mode, the switching voltage corresponding to a voltage at which the lenticular device is in its second view mode,
wherein:
the application of a switching voltage comprises the step of applying a ramp voltage that increases during a ramp period of at least 0.50 second from a starting voltage at which the lenticular device is in its first view mode to a final voltage at which the lenticular device is in its second view mode, wherein
during at least 0.40 second of the ramp period, the ramp voltage is at an intermediate voltage that is in the range of 5.0-60% of the minimal voltage for the second view mode; and
the final voltage is equal to or higher than minimal voltage for the second view mode;
wherein the minimal voltage for the second view mode is the minimal voltage that is required for the lenticular device to stay in its second view mode;
wherein, the ramp period is at least 2.0 seconds; and during at least 1.5 seconds of the ramp period, the ramp voltage is in the range of 10-50% of the minimal voltage for the second view mode.