Photodetector and display device with light guide configured to face photodetector circuit and reflect light from a source
First Claim
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1. A photodetector comprising:
- a substrate;
a photodetector circuit on the substrate;
a display circuit on the substrate;
a light unit comprising a light source, a light guide plate, and a fixing member, anda data processing circuit,wherein the light guide plate comprises a first face, a second face opposite to the first face, and a third face, and is configured to be in contact with an object at a part of the first face and to reflect a light emitted from the light source at the part where the object contacts the first face,wherein the second face of the light guide plate is configured to face the photodetector circuit,wherein the fixing member is configured to fix the light source to the third face of the light guide plate and to overlap with the light source and a portion of the light guide plate, andwherein the photodetector circuit is configured to generate a data signal from the light reflected at the part.
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Abstract
Influence of external light is suppressed. With a photodetector including a photodetector circuit which generates a data signal in accordance with illuminance of incident light and a light unit which overlaps with the photodetector circuit, a first data signal is generated by the photodetector circuit when the light unit is in an ON state, a second data signal is formed by the photodetector circuit when the light unit is in an OFF state, and the first data signal and the second data signal are compared, so that a difference data signal that is data of a difference between the two compared data signals is generated.
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Citations
17 Claims
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1. A photodetector comprising:
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a substrate; a photodetector circuit on the substrate; a display circuit on the substrate; a light unit comprising a light source, a light guide plate, and a fixing member, and a data processing circuit, wherein the light guide plate comprises a first face, a second face opposite to the first face, and a third face, and is configured to be in contact with an object at a part of the first face and to reflect a light emitted from the light source at the part where the object contacts the first face, wherein the second face of the light guide plate is configured to face the photodetector circuit, wherein the fixing member is configured to fix the light source to the third face of the light guide plate and to overlap with the light source and a portion of the light guide plate, and wherein the photodetector circuit is configured to generate a data signal from the light reflected at the part. - View Dependent Claims (2, 3, 4, 5)
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6. A photodetector comprising:
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a substrate; photodetector circuits arranged in a matrix on the substrate; a display circuit on the substrate; a light unit comprising a light source, a light guide plate, and a fixing member; and a data processing circuit, wherein the light guide plate comprises a first face, a second face opposite to the first face, and a third face, and is configured to be in contact with an object at a part of the first face and to reflect a light emitted from the light source at the part where the object contacts the first face, wherein the second face of the light guide plate is configured to face the photodetector circuits, wherein the fixing member is configured to fix the light source to the third face of the light guide plate and to overlap with the light source and a portion of the light guide plate, and wherein each of the photodetector circuits is configured to generate a data signal from the light reflected at the part. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A photodetector comprising:
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a substrate; display circuits arranged in a matrix on the substrate; photodetector circuits arranged in a matrix on the substrate; a light unit comprising a light source, a light guide plate, and a fixing member; and a data processing circuit, wherein each of the display circuits and each of the photodetector circuits are arranged periodically on a face of the substrate, wherein the light guide plate comprises a first face, a second face opposite to the first face, and a third face, and is configured to be in contact with an object at a part of the first face and to reflect a light emitted from the light source at the part where the object contacts the first face, wherein the second face of the light guide plate is configured to face the photodetector circuits, wherein the fixing member is configured to fix the light source to the third face of the light guide plate and to overlap with the light source and a portion of the light guide plate, and wherein each of the photodetector circuits generates a data signal from the light reflected at the part. - View Dependent Claims (14, 15, 16, 17)
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Specification