Electronic device including fingerprint sensor and operating method thereof

1. An electronic device comprising:

a light emitting module configured to radiate infrared light;

a window disposed on the light emitting module and having a specific refractive index with respect to the infrared light, wherein the window includes a refraction part configured to reflect the infrared light inside the window in correspondence with the specific refractive index;

a light change pattern formed in the window to correspond to an area in which the light emitting module is disposed and formed on a non-displaying area, and configured to change a propagation direction of the infrared light; and

a fingerprint sensor disposed under the window and configured to obtain a fingerprint of a user based on a user input on the window using scattered light of the infrared light.

2. The electronic device of claim 1 , wherein the window further includes a light transmitting layer in at least a partial area of the window, and

wherein the light emitting module is configured to radiate the infrared light through the light transmitting layer.

3. The electronic device of claim 1 , further comprising:

a light guide member which is interposed between the window and the light emitting module.

4. An electronic device comprising:

a window having a first refractive index with respect to light;

a light emitting module disposed on one surface of the window and configured to radiate infrared light such that the infrared light is reflected inside the window in correspondence with the first refractive index;

a light change pattern formed in the window to correspond to an area in which the light emitting module is disposed and formed on a non-displaying area, and configured to change a propagation direction of the infrared light;

a connection member having a second refractive index and is interposed between the window and the light emitting module; and

a fingerprint sensor disposed under the window and configured to obtain a fingerprint of a user based on a user input on the window using scattered light of the infrared light.

5. The electronic device of claim 4 , further comprising:

a light transmitting layer disposed under the window corresponding to an area in which the light emitting module is disposed and passing the infrared light such that the infrared light proceeds toward an inside of the window.

6. The electronic device of claim 4 , wherein the light change pattern includes a scratch pattern.

7. The electronic device of claim 4 , wherein the light change pattern includes:

an optical member seated in a recess provided in an area under the window and configured to change a propagation path of the infrared light; or

an optical member disposed in an area under the window and configured to change the propagation path of the infrared light.

8. The electronic device of claim 4 , further comprising one of:

a reflection plate disposed on a side surface of the window such that the infrared light is totally reflected toward an inside of the window by reflecting the infrared light; or

a light guide member interposed between the light emitting module and a bottom surface of the window and configured to guide the infrared light toward the inside of the window.

9. The electronic device of claim 8 , wherein the light guide member includes:

a body part disposed such that one surface of the body part faces the light emitting module; and

an adhesive member configured to fix the body part to the bottom surface of the window.

10. The electronic device of claim 4 , further comprising:

a light guide member including the light emitting module and disposed under the window to guide the infrared light toward an inside of the window,

wherein the light guide member includes:

a sensor substrate in which the light emitting module is seated;

a body part surrounding the light emitting module; and

an adhesive member configured to fix the lens body part to a bottom surface of the window.

11. The electronic device of claim 4 , further comprising:

a light guide member including the light emitting module and disposed under the window to guide the infrared light toward the inside of the window,

wherein the light guide member includes:

a fixing part of which one surface is disposed to face the window;

a sensor substrate which is disposed in the fixing part and in which the light emitting module is mounted;

a body part surrounding the light emitting module to guide the infrared light toward the window; and

an adhesive member configured to fix the body part to a bottom surface of the window.

12. The electronic device of claim 4 , wherein the light emitting module includes a plurality of light emitting modules disposed under one side of the window which is adjacent to the fingerprint sensor.

13. The electronic device of claim 4 , further comprising:

a proximity sensor disposed under one side of the window,

wherein the light emitting module is disposed to:

emit light of a specified wavelength band toward the inside of the window through one side of a light receiving unit or a light emitting unit of the proximity sensor, or

emit light to a reflection member disposed on one side of the light receiving unit or the light emitting unit of the proximity sensor and allow light reflected by the reflection member to proceed while the light is totally reflected toward the inside of the window.

14. The electronic device of claim 4 , further comprising:

a speaker housing disposed on one side of the window; and

a reflection area disposed on one side of the speaker housing,

wherein the light emitting module is disposed to allow the infrared light emitted to the reflection area to proceed while the infrared light emitted to the reflection area is totally reflected toward an inside of the window after being reflected in the reflection area.

15. The electronic device of claim 4 , further comprising:

a speaker housing disposed under one side of the window,

wherein the light emitting module is disposed on one side of the speaker housing such that the infrared light emitted toward the inside of the window proceeds while being totally reflected.

16. The electronic device of claim 4 , further comprising:

an illuminance sensor disposed under one side of the window,

wherein the light emitting module is disposed on one side of the illuminance sensor such that the infrared light emitted toward the inside of the window proceeds while being totally reflected.

17. The electronic device of claim 4 , further comprising:

a display light emitting unit disposed in a periphery of the fingerprint sensor and configured to radiate a specific luminance or color with regard to an operation of the light emitting module.

18. A method of operating an electronic device, the method comprising:

receiving a user input;

activating a light emitting module disposed in an area under a periphery of a window such that infrared light is emitted while being reflected toward an inside of the window;

generating a fingerprint image by collecting the infrared light reflected on a surface of a finger disposed on the window while the infrared light is reflected inside the window and a light change pattern formed in the window to correspond to an area in which the light emitting module is disposed and formed on a non-displaying area, and configured to change a propagation direction of the infrared light; and

performing fingerprint authentication associated with the fingerprint image.