Electronic device including light detection device and operation method thereof
An electronic device is disclosed and includes a housing; a display that is exposed through one surface of the housing; a light emitting unit that is disposed on at least a part of a rear surface of the display and includes at least one light source for outputting light of at least one wavelength band; a light receiving unit that includes at least one area for receiving light of the at least one wavelength band; a light blocking element for blocking light, that is output from the at least one light source, from entering a switch for turning on/off at least one pixel of the display; a processor electrically connected with the display, the light emitting unit, and the light receiving unit; and a memory electrically connected with the processor, in which the memory includes instructions that cause, when executed, the processor to output light through the at least one light source in a state where one or more pixels included in a specific area of the display, which includes an area covering the at least one light source, are turned off or displayed in a specific color.
1. An electronic device comprising:
a housing;
a display exposed through a surface of the housing;
a light emitting unit configured to be disposed on at least a part of a rear surface of the display, and including at least one light source for outputting light of at least one wavelength band;
a light receiving unit configured to include at least one area for receiving light of the at least one wavelength band;
a light blocking element that blocks light output from the at least one light source, from entering a switch for turning on/off at least one pixel of the display;
a processor electrically connected with the display, the light emitting unit, and the light receiving unit; and
a memory electrically connected with the processor,
wherein the memory includes instructions configured to cause, when executed, the processor to output light through the at least one light source in a state where one or more pixels included in a specific area of the display, which includes an area covering the at least one light source, are turned off or displayed in a specific color.
2. The electronic device of claim 1 , further comprising:
a first power supply unit electrically connected to the one or more pixels included in the specific area of the display; and
a second power supply unit electrically connected to pixels included in a remaining area of the display,
wherein the instructions further cause the processor to selectively block a supply of power from the first power supply unit among the first power supply unit and the second power supply unit when outputting light through the at least one light source.
3. The electronic device of claim 1 , wherein the instructions further cause the processor to set an interval, in which a pixel is turned off for a part of time in a frame, and output light through the at least one light source in the set interval, when an image is displayed on the display.
4. The electronic device of claim 3 , wherein the display is an active matrix organic light emitting diode (AMOLED) display.
5. The electronic device of claim 1 , wherein the instructions further cause the processor to adjust the display in order to display the one or more pixels included in the specific area of the display in a black color.
6. The electronic device of claim 1 , wherein the switch includes a thin film transistor (TFT), and the light blocking element is configured to block light, that is output from the at least one light source, from entering a semiconductor layer within the TFT.
7. The electronic device of claim 6 , wherein the light blocking element is included inside the display and disposed between the semiconductor layer of the switch and the rear surface of the display.
8. The electronic device of claim 7 , wherein the light blocking element includes a light shielding material that covers the semiconductor layer of the switch.
9. The electronic device of claim 8 , wherein the semiconductor layer comprises a first surface facing the surface of the housing, a second surface facing the rear surface of the display, and a third surface that connects the first surface and the second surface, and the light blocking element covers at least one of the second surface and the third surface.
10. The electronic device of claim 7 , wherein the display includes a buffer layer disposed between the semiconductor layer and the rear surface of the display, and the light blocking element is disposed between the semiconductor layer and the buffer layer.
11. The electronic device of claim 1 , wherein:
the housing includes a first surface facing a first direction, a second surface facing a second direction opposite to the first direction, and a bezel that surrounds a space between the first surface and the second surface, wherein the surface of the housing includes the first surface and the second surface;
the display is exposed through the first surface and includes an edge area overlapping at least a part of an area adjacent to an edge of the first surface; and
the specific area of the display includes the edge area.
12. The electronic device of claim 1 , wherein the instructions further cause the processor to determine whether an object is proximate by comparing a value corresponding to light received by the light receiving unit with a threshold value related to proximity recognition of the object, and to decrease an output intensity of the light emitting unit when it is determined that the object is proximate.
13. The electronic device of claim 12 , wherein the instructions further cause the processor to change the threshold value as the output intensity of the light emitting unit decreases.
14. An operation method of an electronic device, comprising:
outputting light through at least one light source disposed on at least a part of a rear surface of a display in a state where one or more pixels included in a specific area of the display, which includes an area on the rear surface of which the at least one light source is mounted, are turned off or displayed in a specific color; and
receiving at least a part of light scattered or reflected from an object through a light receiving unit disposed on at least a part of the rear surface of the display.
15. The operation method of claim 14 , further comprising:
selectively blocking, among a first power supply unit electrically connected to the one or more pixels included in the specific area of the display and a second power supply unit electrically connected to pixels included in the remaining area of the display, a supply of power from the first power supply unit.
16. The operation method of claim 14 , wherein outputting the light through the at least one light source disposed on at least a part of the rear surface of the display comprises setting an interval, in which a pixel is turned off for a part of time in a frame, and outputting light through the at least one light source in the set interval, when an image is displayed on the display.
17. The operation method of claim 14 , wherein the one or more pixels included in the specific area of the display are displayed in a black color.
18. The operation method of claim 14 , further comprising:
determining whether the object is proximate by comparing a value corresponding to light received by the light receiving unit with a threshold value related to proximity recognition of the object; and decreasing an output intensity of the at least one light source when it is determined that the object is proximate.
19. The operation method of claim 18 , further comprising:
changing the threshold value as the output intensity of the at least one light source decreases.
20. The operation method of claim 18 , further comprising, when at least one application is executed based on an external signal and/or a user input,
performing output through the at least one light source,
determining whether the object is proximate, and
decreasing the output intensity of the at least one light source.