Input device and display device with input function
First Claim
1. An input device comprising:
- a light-transmissive touch panel,a phase difference plate disposed on the opposite side to an input operation surface of the touch panel,a ¼
wavelength plate disposed on the side of the input operation surface of the touch panel, anda polarizing plate on the touch panel side, which is disposed on the ¼
wavelength plate toward the input operation surface of the touch panel,wherein a ratio R1 (450 nm)/R1 (590 nm) of the phase difference value R1 (450 nm) for the phase difference plate at a wavelength of 450 nm to the phase difference value R1 (590 nm) for the phase difference plate at a wavelength of 590 nm is greater than a ratio R0 (450 nm)/R0 (590 nm) of the phase difference value R0 (450 nm) for the ¼
wavelength plate at a wavelength of 450 nm to the phase difference value R0 (590 nm) for the ¼
wavelength plate at a wavelength of 590 nm,the phase difference value R1 (590 nm) for the phase difference plate at a wavelength of 590 nm is smaller than the phase difference value R0 (590 nm) for the ¼
wavelength plate at a wavelength of 590 nm, andan absolute value of an angle between the retardation axis of the phase difference plate and the retardation axis of the ¼
wavelength plate is in the range of 60°
to 85°
.
3 Assignments
0 Petitions
Accused Products
Abstract
An input device which includes a light-transmissive touch panel, a phase difference plate disposed on the opposite side to an input operation surface of the touch panel, a ¼ wavelength plate disposed on the side of the input operation surface of the touch panel, and a polarizing plate on the touch panel side, which is disposed on the ¼ wavelength plate toward the input operation surface of the touch panel, wherein a ratio R1 (450 nm)/R1 (590 nm) of the phase difference value R1 (450 nm) for the phase difference plate at a wavelength of 450 nm to the phase difference value R1 (590 nm) for the phase difference plate at a wavelength of 590 nm is greater than a ratio R0 (450 nm)/R0 (590 nm) of the phase differences value R0 (450 nm) for the ¼ wavelength plate at a wavelength of 450 nm to the phase difference value R0 (590 nm) for the ¼ wavelength plate at a wavelength of 590 nm, the phase difference value R1 (590 nm) for the phase difference plate at a wavelength of 590 nm is smaller than the phase difference value R0 (590 nm) for the ¼ wavelength plate at a wavelength of 590 nm, and an absolute value of an angle between the retardation axis of the phase difference plate and the retardation axis of the ¼ wavelength plate is in the range of 60° to 85°.
21 Citations
7 Claims
-
1. An input device comprising:
-
a light-transmissive touch panel, a phase difference plate disposed on the opposite side to an input operation surface of the touch panel, a ¼
wavelength plate disposed on the side of the input operation surface of the touch panel, anda polarizing plate on the touch panel side, which is disposed on the ¼
wavelength plate toward the input operation surface of the touch panel,wherein a ratio R1 (450 nm)/R1 (590 nm) of the phase difference value R1 (450 nm) for the phase difference plate at a wavelength of 450 nm to the phase difference value R1 (590 nm) for the phase difference plate at a wavelength of 590 nm is greater than a ratio R0 (450 nm)/R0 (590 nm) of the phase difference value R0 (450 nm) for the ¼
wavelength plate at a wavelength of 450 nm to the phase difference value R0 (590 nm) for the ¼
wavelength plate at a wavelength of 590 nm,the phase difference value R1 (590 nm) for the phase difference plate at a wavelength of 590 nm is smaller than the phase difference value R0 (590 nm) for the ¼
wavelength plate at a wavelength of 590 nm, andan absolute value of an angle between the retardation axis of the phase difference plate and the retardation axis of the ¼
wavelength plate is in the range of 60°
to 85°
. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
Specification
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- Resources
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Current AssigneeJapan Display West Incorporated (Japan Display Incorporated)
-
Original AssigneeSony Corporation (Sony Group Corp.)
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InventorsIljima, Chiyoaki
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Primary Examiner(s)Chow, Van
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Application NumberUS12/546,978Publication NumberTime in Patent Office938 DaysField of Search345/173, 349/117, 349/96, 349/115US Class Current345/173CPC Class CodesG02F 1/13338 Input devices, e.g. touch p...G02F 1/133531 characterised by the arrang...G02F 1/133638 Waveplates, i.e. plates wit...G06F 3/045 using resistive elements, e...
