US 11,683,469 B2
Stereoscopic image display device
Chun-Hsiang Yang, Hsinchu (TW); Chih-Hung Ting, New Taipei (TW); Kai-Chieh Chang, Kaohsiung (TW); Hsin-You Hou, New Taipei (TW); and Kuan-Yu Chen, Taichung (TW)
Assigned to Lixel Inc., Taipei (TW)
Filed by Lixel Inc., Taipei (TW)
Filed on Jul. 8, 2021, as Appl. No. 17/369,960.
Claims priority of application No. 110111910 (TW), filed on Mar. 31, 2021.
Prior Publication US 2022/0321863 A1, Oct. 6, 2022
Int. Cl. G02F 1/1335 (2006.01); H04N 13/307 (2018.01); G02F 1/1339 (2006.01)
CPC H04N 13/307 (2018.05) [G02F 1/1339 (2013.01); G02F 1/133526 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A stereoscopic image display device, comprising:
a flat panel display unit having a display surface;
a lens array unit including at least one condenser lens, the at least one condenser lens being disposed on a side of the display surface; and
a spacer unit being disposed between the display surface and the at least one condenser lens, such that the lens array unit and the flat panel display unit are spaced apart from each other;
wherein, in a light field system of the stereoscopic image display device, an object distance between the display surface of the flat panel display unit and the at least one condenser lens of the lens array unit satisfies a predetermined range of 0.5 mm to 300 mm, and the object distance is configured to enable an absolute value of a central depth plane (CDP) of the stereoscopic image display device in the light field system to be between 1 mm and 200 mm; wherein the CDP of the stereoscopic image display device in the light field system is calculated by substituting the object distance into a lens image formation formula of the light field system;
wherein the object distance between the display surface and the at least one condenser lens satisfies a formula of:
s=s1+A1H;
wherein s is the object distance; s1 is an equivalent spacing; A1 is a position of a vertex of a first surface of the at least one condenser lens, the first surface being a surface of the at least one condenser lens facing the display surface; H is a position of a first principle point of the at least one condenser lens; and A1H is a distance from A1 to H;
wherein the spacer unit includes a plurality of light-transmitting layers stacked upon one another, the plurality of light-transmitting layers are sequentially defined as a first light-transmitting layer to an n-th light-transmitting layer along a direction of the display surface of the flat panel display unit toward the at least one condenser lens of the lens array unit, and n is a positive integer not less than 2;
wherein the first light-transmitting layer to the n-th light-transmitting layer respectively have a first thickness T1 to an n-th thickness Tn, and the first light-transmitting layer to the n-th light-transmitting layer sequentially have a first refractive index N1 to an n-th refractive index Nn; wherein a calculation formula of the equivalent spacing s1 is:

OG Complex Work Unit Math
wherein the plurality of light-transmitting layers of the spacer unit is between 2 layers and 20 layers; wherein, in the plurality of light-transmitting layers, each of the light-transmitting layers has a thickness between 0.01 mm and 30 mm, and each of the light-transmitting layers has a refractive index between 1 and 2.