LCD touchscreen panel with scanning backlight
First Claim
1. A liquid crystal display (LCD) device configured to operate under at least a normal display mode and a touchscreen mode comprising:
- a casing;
a transparent touchscreen surface held into place by the casing;
a liquid crystal (LC) layer disposed within the casing behind the touchscreen surface, at least part of the LC layer being partitioned according to a plurality of touchscreen keys;
at least one probe light sensor disposed within the casing behind the LC layer and configured to detect user contact with at least one of the plurality of touchscreen keys using a light sensing operation while the device is in the touchscreen mode and not detect user contact while the device is in a display mode; and
one or more probe light emitters disposed within the casing behind the LC layer, each probe light emitter configured to emit consubstantial light that impinges upon the at least one of the plurality of touchscreen keys to be detected by the light sensing operation.
1 Assignment
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Accused Products
Abstract
A liquid crystal display (LCD) device (100) having an integrated touchscreen, includes a touchscreen surface and LC layer (20) that are partitioned according to the touchscreen keys (200). A corresponding probe light source (82) and sensor (92) positioned behind each partition is assigned to the corresponding touchscreen key. Each probe light sensor is configured to detect user contact on the touchscreen surface by sensing a reflection of the probe light. To further distinguish between different keys, each key may be made active according to a scanning or timesharing process. In this process, when a particular key is active, the neighboring keys are inactive. The scanning/timesharing process may be performed during a touchscreen mode of operation, which is interleaved with a normal display mode.
25 Citations
20 Claims
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1. A liquid crystal display (LCD) device configured to operate under at least a normal display mode and a touchscreen mode comprising:
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a casing; a transparent touchscreen surface held into place by the casing; a liquid crystal (LC) layer disposed within the casing behind the touchscreen surface, at least part of the LC layer being partitioned according to a plurality of touchscreen keys; at least one probe light sensor disposed within the casing behind the LC layer and configured to detect user contact with at least one of the plurality of touchscreen keys using a light sensing operation while the device is in the touchscreen mode and not detect user contact while the device is in a display mode; and one or more probe light emitters disposed within the casing behind the LC layer, each probe light emitter configured to emit consubstantial light that impinges upon the at least one of the plurality of touchscreen keys to be detected by the light sensing operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A liquid crystal display (LCD) device, configured to operate under a plurality of interleaved modes, comprising:
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a casing; a transparent touchscreen surface held into place by the casing, at least part of the touchscreen surface being partitioned into a plurality of LC partitions according to a plurality of touchscreen keys, a liquid crystal (LC) layer disposed within the casing behind the touchscreen surface, at least part of the LC layer being partitioned according to the plurality of touchscreen keys, wherein each LC layer partition is configured to be selectively transparent and opaque during touchscreen mode, such that; the LC layer partition is transparent while the corresponding touchscreen key is active, thereby providing a probe light opening for the corresponding touchscreen key, and the LC partition is opaque while the corresponding touchscreen key is inactive; and a plurality of probe light sources each configured to emitting a consubstantial light emission, and a plurality of probe light sensors disposed within the casing behind the LC layer, such that each touchscreen key of the plurality is matched up with a corresponding probe light source and with a probe light sensor, wherein user contact with a particular touchscreen key of the plurality is detected when the corresponding light source transmits a probe light and the corresponding probe light sensor senses a reflection of the probe light from the corresponding partition of the touchscreen surface. - View Dependent Claims (18, 19, 20)
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Specification