Fingerprint recognition sensor
First Claim
1. A fingerprint recognition sensor comprising:
- a substrate;
a backlight unit including a base layer positioned on one surface of the substrate and including a transparent material, and a light source irradiating light to the inside of the base layer on one side of the base layer, in which light of which an incident angle on a surface facing the substrate is larger than a critical angle in the light irradiated from the light source is transmitted toward the substrate;
a cover layer spaced apart from the substrate and facing the other surface of the substrate;
multiple sensor pixels defined by multiple scan lines and multiple data readout lines on the other surface of the substrate and positioned between the substrate and the cover layer; and
multiple photo sensors positioned in the respective sensor pixels and sensing the light transmitted from the base layer toward the substrate and total-reflected on a surface contacting a fingerprint of a user on the cover layer,wherein;
the base layer is formed to be larger than the substrate, andthe base layer includes a light transmission unit overlapped with the substrate, and a light guide unit not overlapped with the substrate and positioned between the light source and the light transmission unit, andin the light guide unit, light of which an angle between the light and a normal of the interface between the light guide unit and the external material is larger than the critical angle in the light irradiated from the light source is guided to the light transmission unit and light of which an angle between the light and a normal of the interface between the light guide unit and the external material is smaller than the critical angle in the light irradiated from the light source is not guided to the light transmission unit.
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Accused Products
Abstract
Disclosed is a fingerprint recognition sensor including: a backlight unit including a base layer positioned on one surface of a substrate and including a transparent material and a light source irradiating light to the inside of the base layer on one side of the base layer, in which light in which an incident angle on a surface facing the substrate is larger than a critical angle is transmitted toward the substrate; a cover layer spaced apart from the substrate and facing the other surface of the substrate; multiple sensor pixels defined by multiple scan lines and multiple data readout lines on the other surface of the substrate and positioned between the substrate and the cover layer; and multiple photo sensors positioned in the respective sensor pixels and sensing light transmitted on the base layer toward the substrate and total-reflected on a surface contacting a fingerprint of a user on the cover layer.
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Citations
17 Claims
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1. A fingerprint recognition sensor comprising:
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a substrate; a backlight unit including a base layer positioned on one surface of the substrate and including a transparent material, and a light source irradiating light to the inside of the base layer on one side of the base layer, in which light of which an incident angle on a surface facing the substrate is larger than a critical angle in the light irradiated from the light source is transmitted toward the substrate; a cover layer spaced apart from the substrate and facing the other surface of the substrate; multiple sensor pixels defined by multiple scan lines and multiple data readout lines on the other surface of the substrate and positioned between the substrate and the cover layer; and multiple photo sensors positioned in the respective sensor pixels and sensing the light transmitted from the base layer toward the substrate and total-reflected on a surface contacting a fingerprint of a user on the cover layer, wherein; the base layer is formed to be larger than the substrate, and the base layer includes a light transmission unit overlapped with the substrate, and a light guide unit not overlapped with the substrate and positioned between the light source and the light transmission unit, and in the light guide unit, light of which an angle between the light and a normal of the interface between the light guide unit and the external material is larger than the critical angle in the light irradiated from the light source is guided to the light transmission unit and light of which an angle between the light and a normal of the interface between the light guide unit and the external material is smaller than the critical angle in the light irradiated from the light source is not guided to the light transmission unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A fingerprint recognition sensor comprising:
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a backlight unit including a base layer and a light source irradiating light to the inside of the base layer on one side of the base layer; a cover layer spaced apart from the base layer and facing the base layer; multiple sensor pixels defined by multiple scan lines and multiple data readout lines on the base layer and positioned between the base layer and the cover layer; and multiple photo sensors positioned in the respective sensor pixels and sensing light transmitted from the base layer toward the cover layer and total-reflected on a surface contacting a fingerprint of a user on the cover layer, wherein, in the backlight unit, light of which an incident angle on a surface facing the cover layer in the base layer is larger than a critical angle in the light irradiated from the light source is transmitted toward the cover layer and light of which an incident angle on a surface facing the cover layer in the base layer is smaller than a critical angle in the light irradiated from the light source is not transmitted toward the cover layer.
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16. A fingerprint recognition sensor comprising:
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a substrate; a backlight unit including a base layer positioned on one surface of the substrate and including a transparent material, and a light source irradiating light to the inside of the base layer on one side of the base layer, in which light of which an incident angle on a surface facing the substrate is larger than a critical angle in the light irradiated from the light source is transmitted toward the substrate; a cover layer spaced apart from the substrate and facing the other surface of the substrate; multiple sensor pixels defined by multiple scan lines and multiple data readout lines on the other surface of the substrate and positioned between the substrate and the cover layer; and multiple photo sensors positioned in the respective sensor pixels and sensing the light transmitted from the base layer toward the substrate and total-reflected on a surface contacting a fingerprint of a user on the cover layer, wherein; the backlight unit further includes a light direction switching member positioned between a front surface of the light source and a lateral surface of the base layer, and the light direction switching member deflects light irradiated from the light source so that the incident angle on the surface facing the substrate in the base layer is larger than the critical angle. - View Dependent Claims (17)
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Specification