Touch-sensing display panel
First Claim
1. A touch-sensing display panel, comprising:
- a plurality of image-forming pixel elements;
a planar light guide with a first refractive index, the planar light guide having a front surface forming a touch-sensing region and an opposite rear surface facing the plurality of image-forming pixel elements;
a plurality of light emitters arranged at a peripheral region of the touch-sensing display panel to emit light into the planar light guide for propagation therein through total internal reflection in at least the front surface;
a plurality of light detectors at the peripheral region for receiving light from the planar light guide; and
an optical layer at the rear surface of the planar light guide to cover image-forming pixel elements in at least a central region of the touch-sensing display panel,wherein said optical layer is configured to reflect at least a part of the light from the plurality of light emitters impinging thereon from within the planar light guide,wherein the optical layer has a second refractive index, which is less than the first refractive index, andwherein an extension portion of the optical layer is arranged over the plurality of light emitters, said extension portion having a third refractive index, which is greater than the second refractive index.
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Abstract
A touch-sensing display panel, comprising a plurality of image-forming pixel elements; a planar light guide with a first refractive index, having a front surface forming a touch-sensing region and an opposite rear surface facing the pixel elements; a plurality of light emitters arranged at a peripheral region of the panel to emit light into the light guide for propagation therein through total internal reflection; a plurality of light detectors disposed at the peripheral region for receiving light from the light guide; and an optical layer disposed at the rear surface of the light guide to cover a plurality of the image-forming pixel elements in at least a central region of the panel, wherein said optical layer is configured to reflect at least a part of the light from the emitters impinging thereon from within the light guide.
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Citations
22 Claims
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1. A touch-sensing display panel, comprising:
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a plurality of image-forming pixel elements; a planar light guide with a first refractive index, the planar light guide having a front surface forming a touch-sensing region and an opposite rear surface facing the plurality of image-forming pixel elements; a plurality of light emitters arranged at a peripheral region of the touch-sensing display panel to emit light into the planar light guide for propagation therein through total internal reflection in at least the front surface; a plurality of light detectors at the peripheral region for receiving light from the planar light guide; and an optical layer at the rear surface of the planar light guide to cover image-forming pixel elements in at least a central region of the touch-sensing display panel, wherein said optical layer is configured to reflect at least a part of the light from the plurality of light emitters impinging thereon from within the planar light guide, wherein the optical layer has a second refractive index, which is less than the first refractive index, and wherein an extension portion of the optical layer is arranged over the plurality of light emitters, said extension portion having a third refractive index, which is greater than the second refractive index. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification