Dual purpose touch sensor panel and optical retarder
First Claim
1. A device, comprising:
- a touch sensor panel disposed on a substrate; and
a display that emits linearly polarized light towards the touch sensor panel,wherein the substrate introduces optical retardation to the light as it passes through the touch sensor panel and the touch sensor panel is oriented with respect to the display such that a 45°
±
30°
or 135°
±
30°
angle is formed between the optical axis in the substrate of the touch sensor panel and a polarization axis of the light emitted from the display.
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Accused Products
Abstract
When a user operates a touch sensor panel having an LCD device outdoors or in a bright environment, light reflecting off the device can create glare. In order to reduce glare, a user can view the device through polarized filters such as polarized sunglasses. Doing so can reduce the visibility of the image displayed on the LCD. A quarter-wave retardation film can be added to the touch sensor panel'"'"'s LCD device to mitigate these effects by producing circularly polarized light. However, adding a separate quarter-wave retardation film can increase the thickness and cost of manufacturing the touch sensor panel. Embodiments of the present disclosure are directed to a touch sensor panel constructed from a base film having quarter-wave retardation properties that can produce circularly polarized light. Because the base film has the desired optical properties, a separate quarter-wave retardation film may not be needed.
32 Citations
18 Claims
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1. A device, comprising:
-
a touch sensor panel disposed on a substrate; and a display that emits linearly polarized light towards the touch sensor panel, wherein the substrate introduces optical retardation to the light as it passes through the touch sensor panel and the touch sensor panel is oriented with respect to the display such that a 45°
±
30°
or 135°
±
30°
angle is formed between the optical axis in the substrate of the touch sensor panel and a polarization axis of the light emitted from the display. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for converting linearly polarized light into circularly polarized light in a device having a display and a touch sensor panel, the touch sensor panel having a substrate, the method comprising:
-
emitting linearly polarized light from the display towards the touch sensor panel; orienting the touch sensor panel with respect to the display such that a 45°
±
30°
or 135°
±
30°
angle is formed between an optical axis in the substrate of the touch sensor panel and a polarization axis of the light emitted from the display; andintroducing optical retardation to the light using the substrate as the light passes through the touch sensor panel, wherein the substrate of the touch sensor panel introduces the optical retardation. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification