Display device for providing biometric information using infrared light
A display device includes display pixels arranged in a display area of a display panel, infrared light emitting pixels arranged in the display area to alternate with the display pixels, light sensing pixels arranged in the display area to alternate with the infrared light emitting pixels, a display scan driver supplying display scan signals to the display pixels and the infrared light emitting pixels, a light sensing driver sequentially supplying sensing scan signals to the light sensing pixels, and a component detection circuit for analyzing biomarker information using light sensing signals received from the light sensing pixels, which are based on light reflected from an object in front of the display panel.
1 . A display device comprising:
display pixels arranged in a display area of a display panel;
infrared light emitting pixels arranged in the display area to alternate with the display pixels along a diagonal direction relative to intersecting first and second directions;
light sensing pixels arranged in the display area to alternate with the infrared light emitting pixels along the first direction and the second direction, wherein the light sensing pixels detect light sensing signals based on reflected light reflected from an object in front of the display panel;
a display scan driver supplying display scan signals to the display pixels and the infrared light emitting pixels;
a light sensing driver sequentially supplying sensing scan signals to the light sensing pixels; and
a component detection circuit for generating biomarker information using the light sensing signals received from the light sensing pixels.
2 . The display device of claim 1 , wherein the display area comprises:
an image display area in which only the display pixels are disposed without the infrared light emitting pixels and the light sensing pixels; and
at least one reflected light sensing area in which the display pixels, the infrared light emitting pixels, and the light sensing pixels are alternately disposed.
3 . The display device of claim 2 , where the image display area completely surrounds the reflected light sensing area.
4 . The display device of claim 3 , wherein in the display area, first and second display pixels respectively displaying red light and green light among the display pixels, one infrared light emitting pixel and one light sensing pixel are arranged to form a first unit pixel, and second and third display pixels respectively displaying green light and blue light among the display pixels, one infrared light emitting pixel and one light sensing pixel are arranged to form a second unit pixel.
5 . The display device of claim 4 , wherein the first and second unit pixels are alternately arranged in a zigzag pattern along the first direction and the second direction or are alternately arranged in a matrix along the first direction and the second direction.
6 . The display device of claim 3 , wherein the light sensing pixels generate the light sensing signals corresponding to amounts of the reflected light incident and transmit the light sensing signals to the component detection circuit by sequentially responding to the display scan signals received from the display scan driver through display scan wirings.
7 . The display device of claim 3 , wherein the component detection circuit comprises:
a first analog-to-digital (A2D) converter converting a first light sensing signal received from each light sensing pixel in a first reflected light sensing area of the display area into a digital first light sensing signal;
a second A2D converter converting a second light sensing signal from each light sensing pixel in a second reflected light sensing area of the display area into a digital second light sensing signal;
a delay circuit storing, delaying, and outputting at least one of the digital first and second light sensing signals in units of at least one horizontal line or frame;
an arithmetic processing unit generating biometric data by performing an arithmetic operation on a digital light sensing signal output from the first A2D converter and at least one of the delayed first and second light sensing signals output from the delayed circuit; and
a logic circuit comparing the biometric data with preset biomarker data to generate a comparison result and detecting the biomarker information using the comparison result.
8 . A display device comprising:
display pixels arranged in a display area of a display panel;
infrared light emitting pixels arranged in the display area to alternate with the display pixels;
light sensing pixels arranged in the display area to alternate with the infrared light emitting pixels, wherein the light sensing pixels detect light sensing signals based on reflected light reflected from an object;
a display scan driver supplying display scan signals to the display pixels and the infrared light emitting pixels;
a light sensing driver sequentially supplying sensing scan signals to the light sensing pixels;
a component detection circuit for generating biomarker information using the light sensing signals received from the light sensing pixels;
a touch sensing circuit for detecting coordinate data of a touch position of a user through touch electrodes of a touch sensor; and
a main driving circuit controlling driving timings of the display pixels, the light emitting pixels, the light sensing driver, and the display scan driver,
wherein the display area comprises:
an image display area in which only the display pixels are disposed without the infrared light emitting pixels and the light sensing pixels; and
a first reflected light sensing area in which the infrared light emitting pixels are arranged to alternate with the display pixels along a first diagonal row extending diagonally relative to a first direction of the display panel, and the light sensing pixels are arranged to alternate with the display pixels along a second diagonal row adjacent to the first diagonal row,
where the image display area completely surrounds the reflected light sensing area.
9 . The display device of claim 8 , wherein in the display area, first and second display pixels respectively displaying red light and green light among the display pixels, one infrared light emitting pixel and one light sensing pixel are arranged to form a first unit pixel, and second and third display pixels respectively displaying green light and blue light among the display pixels, one infrared light emitting pixel and one light sensing pixel are arranged to form a second unit pixel.
10 . The display device of claim 9 , wherein the first and second unit pixels are alternately arranged in a zigzag pattern along the first direction and a second direction or are alternately arranged in a matrix along the first direction and the second direction.
11 . The display device of claim 8 , wherein the light sensing pixels generate the light sensing signals corresponding to amounts of the reflected light incident and transmit the light sensing signals to the component detection circuit by sequentially responding to the display scan signals received from the display scan driver through display scan wirings.
12 . The display device of claim 8 , wherein the component detection circuit comprises:
a first analog-to-digital (A2D) converter converting a first light sensing signal received from each light sensing pixel in a first reflected light sensing area of the display area into a digital first light sensing signal;
a second A2D converter converting a second light sensing signal from each light sensing pixel in a second reflected light sensing area of the display area into a digital second light sensing signal;
a delay circuit storing, delaying, and outputting at least one of the digital first and second light sensing signals in units of at least one horizontal line or frame;
an arithmetic processing unit generating biometric data by performing an arithmetic operation on a digital light sensing signal output from the first A2D converter and at least one of the delayed first and second light sensing signals output from the delayed circuit; and
a logic circuit comparing the biometric data with preset biomarker data to generate a comparison result and detecting the biomarker information using the comparison result.
13 . An electronic device including a display device, the display device comprising:
display pixels arranged in a display area of a display panel;
infrared light emitting pixels arranged in the display area to alternate with the display pixels along a diagonal direction relative to intersecting first and second directions;
light sensing pixels arranged in the display area to alternate with the infrared light emitting pixels along the first direction and the second direction, wherein the light sensing pixels detect light sensing signals based on reflected light reflected from an object;
a display scan driver supplying display scan signals to the display pixels and the infrared light emitting pixels;
a light sensing driver sequentially supplying sensing scan signals to the light sensing pixels; and
a component detection circuit for generating biomarker information using the light sensing signals received from the light sensing pixels.
14 . The electronic device of claim 13 , wherein the display area comprises:
an image display area in which only the display pixels are disposed without the infrared light emitting pixels and the light sensing pixels; and
at least one reflected light sensing area in which the display pixels, the infrared light emitting pixels, and the light sensing pixels are alternately disposed.
15 . The electronic device of claim 14 , where the image display area completely surrounds the reflected light sensing area.
16 . The electronic device of claim 15 , wherein in the display area, first and second display pixels respectively displaying red light and green light among the display pixels, one infrared light emitting pixel and one light sensing pixel are arranged to form a first unit pixel, and second and third display pixels respectively displaying green light and blue light among the display pixels, one infrared light emitting pixel and one light sensing pixel are arranged to form a second unit pixel.
17 . The electronic device of claim 16 , wherein the first and second unit pixels are alternately arranged in a zigzag pattern along the first direction and the second direction or are alternately arranged in a matrix along the first direction and the second direction.
18 . The electronic device of claim 15 , wherein the light sensing pixels generate the light sensing signals corresponding to amounts of the reflected light incident and transmit the light sensing signals to the component detection circuit by sequentially responding to the display scan signals received from the display scan driver through display scan wirings.
19 . The electronic device of claim 13 , wherein the component detection circuit comprises:
a first analog-to-digital (A2D) converter converting a first light sensing signal received from each light sensing pixel in a first reflected light sensing area of the display area into a digital first light sensing signal;
a second A2D converter converting a second light sensing signal from each light sensing pixel in a second reflected light sensing area of the display area into a digital second light sensing signal;
a delay circuit storing, delaying, and outputting at least one of the digital first and second light sensing signals in units of at least one horizontal line or frame;
an arithmetic processing unit generating biometric data by performing an arithmetic operation on a digital light sensing signal output from the first A2D converter and at least one of the delayed first and second light sensing signals output from the delayed circuit; and
a logic circuit comparing the biometric data with preset biomarker data to generate a comparison result and detecting the biomarker information using the comparison result.
20 . The electronic device of claim 13 , wherein the display area comprises:
an image display area in which only the display pixels are disposed without the infrared light emitting pixels and the light sensing pixels; and
at least one reflected light sensing area in which the display pixels, the infrared light emitting pixels, and the light sensing pixels are alternately disposed,
where the image display area completely surrounds the reflected light sensing area.