Antenna device
Provided is an antenna device that performs the reading of information via near field wireless communication by using a plurality of antenna patterns, and that has no insensitive area on the touch surface. An antenna device that reads information via near field wireless communication includes an antenna layer 20 that includes a plurality of antenna patterns 21 a to 21 l arrayed in parallel with one another, wherein at least a part of the antenna patterns 21 a to 21 l are arranged so as to overlap with one another when the antenna layer 20 is viewed in a plan view.
1. An antenna device that reads information via Near Field Communication (NFC), the antenna device comprising:
at least one antenna substrate;
a plurality of antennas configured to read information via NFC, the plurality of antennas including a plurality of antenna patterns arrayed in parallel with one another in a first direction on the at least one antenna substrate between flexible printed circuit (FPC) substrates that are parallel to each other in a second direction normal to the first direction; and
the flexible printed circuit substrates are separately provided from the at least one antenna substrate and connected with the plurality of antenna patterns at both ends of the at least one antenna substrate in the second direction and extend outward from the both ends in a plan view,
wherein at least a part of the plurality of antenna patterns is arranged so as to overlap with at least another part of one of the plurality of antenna patterns when the at least one substrate is viewed in a plan view, and
wherein in a portion of the antenna device where antenna lines of adjacent antenna patterns of the plurality of antenna patterns intersect with each other at the FPC substrates when viewed in the plan view at locations where the antenna patterns overlap the FPC substrates, the antenna lines are provided in different layers of the FPC substrates.
2. The antenna device according to claim 1 , wherein the at least a part of the plurality of antenna patterns are is arranged so as to be shifted by half pitch of a width of the at least the part of the plurality of antenna patterns in the first direction.
3. The antenna device according to claim 1 , wherein each of the plurality of antenna patterns is formed in a loop form or in a spiral form wound twice or more.
4. The antenna device according to claim 1 , wherein:
two sets of antenna substrates are provided;
the two sets of the antenna substrates and the plurality of antenna patterns are arranged in such a manner that a direction in which antenna patterns included in one of the two sets of the plurality of antenna substrates are arrayed; and
a direction in which the antenna patterns included in other sets of the two sets of the plurality of antenna substrates are arrayed, intersect at right angles.
5. The antenna device according to claim 4 , further comprising a display panel.
6. The antenna device according to claim 5 , further comprising a light diffusion film provided between the display panel and the at least one antenna substrate.
7. The antenna device according to claim 5 , further comprising a touch panel.
8. The antenna device according to claim 4 , wherein the plurality of antenna patterns are made of a transparent metal or a metal that is patterned in a mesh form.
9. The antenna device according to claim 4 , wherein:
each of the plurality of antenna patterns includes a first antenna line that extends in the second direction, and a second antenna line that is connected with the first antenna line and extends in the first direction; and
in a portion of the antenna device where the first antenna line of one antenna pattern of the plurality of antenna patterns intersects with the second antenna line of an adjacent antenna pattern of the plurality of antenna patterns when viewed in a plan view, the first antenna line and the second antenna line are provided in different layers of the FPC substrates.