US 9,813,685 B2
Projection display apparatus and method of controlling the same
Shinji Kubota, Ina (JP)
Assigned to SEIKO EPSON CORPORATION, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Jun. 13, 2016, as Appl. No. 15/180,636.
Application 15/180,636 is a continuation of application No. 13/821,731, granted, now 9,386,259, previously published as PCT/JP2011/005115, filed on Sep. 12, 2011.
Claims priority of application No. 2010-206411 (JP), filed on Sep. 15, 2010.
Prior Publication US 2016/0373707 A1, Dec. 22, 2016
This patent is subject to a terminal disclaimer.
Int. Cl. G03B 21/00 (2006.01); H04N 9/31 (2006.01); G06F 3/0484 (2013.01); H04N 5/74 (2006.01)
CPC H04N 9/3185 (2013.01) [G06F 3/04847 (2013.01); H04N 5/74 (2013.01); H04N 9/3194 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A projection display apparatus comprising:
an image projecting unit that projects an image;
an operation unit whose output value changes depending on an amount of manual operation;
a correction amount setting unit that changes a keystone correction amount in accordance with the output value of the operation unit; and
a keystone correcting unit that performs keystone correction on the image to be projected in accordance with the keystone correction amount, wherein
the projection display apparatus operates in two operation modes, one is an adjustment mode in which the keystone correction amount is changed in accordance with the output value of the operation unit and the other is a non-adjustment mode,
in the non-adjustment mode, a first dead zone is set within an operation range of the operation unit, the keystone correction amount is fixed while the output value of the operation unit is within the first dead zone and the operation mode is switched to the adjustment mode when the output value is outside the first dead zone, and
when the operation unit is not operated for a period of time in the adjustment mode, the operation mode is switched to the non-adjustment mode.