Display device, authentication method, and program
A display device featuring a touch detection and a fingerprint imaging functions is provided. A display device includes a light-emitting element and a light-receiving element. The light-emitting element includes a first pixel electrode, a light-emitting layer, and a common electrode, and the light-receiving element includes a second pixel electrode, an active layer, and the common electrode. The first pixel electrode and the second pixel electrode are provided on the same plane. The common electrode overlaps with the first pixel electrode with the light-emitting layer therebetween, and overlaps with the second pixel electrode with the active layer therebetween. A first conductive layer, a second conductive layer, and an insulating layer are provided above the common electrode. The insulating layer is provided above the first conductive layer, and the second conductive layer is provided above the insulating layer. The light-receiving element has a function of receiving light emitted from the light-emitting element.
1 . A device comprising:
a control portion;
a memory portion; and
a display portion,
the display portion comprising:
a display element comprising:
a first pixel electrode;
a light-emitting layer; and
a common electrode,
a light-receiving element comprising:
a second pixel electrode;
an active layer; and
the common electrode, and
a first conductive layer,
wherein the display element and the light-receiving element are formed over the same side of a substrate,
wherein the first conductive layer is between the display element and the light-receiving element,
wherein the display portion is configured to display an image with the display element on the basis of image data input from the control portion, and
wherein the display portion is configured to take an image of a fingerprint with the light-receiving element and outputting imaging data to the control portion.
2 . The device according to claim 1 , wherein the display portion is capable of obtaining fingerprint data of a finger that touches any position on a screen.
3 . The device according to claim 1 , wherein the memory portion is configured to retain user's fingerprint data registered in advance.
4 . The device according to claim 3 ,
wherein the control portion further comprises an authentication portion, and
wherein the authentication portion is configured to compare fingerprint data input from the display portion and the fingerprint data retained in the memory portion and perform processing for determining whether the fingerprint data input from the display portion and the fingerprint data retained in the memory portion match or not.
5 . An authentication method for an electronic device, the electronic device comprising:
an authentication portion; and
a display portion comprising:
display elements and light-receiving elements arranged in a matrix; and
a touch sensor for detecting a touch on the display portion in a portion between the display element and the light-receiving element, and
wherein the authentication method comprises:
a step of obtaining positional data of a finger touching the display portion by the touch sensor;
a step of turning on the display element in a first region comprising a position touched by the finger in the display portion;
a step of taking fingerprint data of the first region by the light-receiving element and outputting the fingerprint data to the authentication portion; and
a step of performing user authentication processing using the fingerprint data by the authentication portion,
wherein, when the finger touches a screen in the step of turning on the display element in the first region, a projected area of the finger on the screen is larger than a contact area of the finger.
6 . The authentication method for an electronic device according to claim 5 , wherein the display element in a region other than the first region of the display portion displays another image.
7 . The authentication method for an electronic device according to claim 5 , wherein the display element in a region other than the first region of the display portion emits no light.
8 . The authentication method for an electronic device according to claim 5 , wherein when a luminance or a gray level of the display element that emits brightest light, is assumed to be 100%, a luminance or a gray level of the display element is greater than or equal to 50% and less than or equal to 100% assuming that a luminance or a gray level of the display element that emits brightest light is 100%.
9 . An authentication method for an electronic device, the electronic device comprising:
an authentication portion; and
a display portion comprising:
display elements and light-receiving elements arranged in a matrix; and
a touch sensor for detecting a touch on the display portion in a portion between the display element and the light-receiving element,
wherein the authentication method comprises:
a step of displaying a first image showing a first position to be touched to a user on the display portion;
a step of detecting a touch on the first position to be touched by the touch sensor;
a step of turning on the display element in a first region comprising the first position to be touched in the display portion;
a step of taking fingerprint data of a first finger in the first region by the light-receiving element and outputting the fingerprint data of the first finger to the authentication portion;
a step of performing first user authentication processing using the fingerprint data of the first finger by the authentication portion;
a step of displaying a second image showing a second position to be touched to the user on the display portion after the first finger is authenticated;
a step of detecting a touch on the second position to be touched by the touch sensor;
a step of turning on the display element in a second region comprising the second position to be touched in the display portion;
a step of taking fingerprint data of a second finger in the second region by the light-receiving element and outputting the fingerprint data of the second finger to the authentication portion; and
a step of performing second user authentication processing using the fingerprint data of the second finger by the authentication portion.
10 . The authentication method for an electronic device according to claim 9 , wherein the display element in a region other than the first region and the second region of the display portion displays another image.
11 . The authentication method for an electronic device according to claim 9 , wherein the display element in a region other than the first region and the second region of the display portion emits no light.
12 . The authentication method for an electronic device according to claim 9 , wherein when a luminance or a gray level of the display element that emits brightest light, is assumed to be 100%, a luminance or a gray level of the display element is greater than or equal to 50% and less than or equal to 100%.
13 . The authentication method for an electronic device according to claim 9 , wherein the display portion displays a plurality of images showing positions to be touched by two or more fingers simultaneously and the authentication processing is performed based on two or more fingerprint data.
14 . The authentication method for an electronic device according to claim 5 , wherein when the contact area is assumed to be 100%, a range that emits light is greater than or equal to 50 % and less than or equal to 150%.
15 . The authentication method for an electronic device according to claim 9 , wherein when the contact area is assumed to be 100%, a range that emits light is greater than or equal to 50 % and less than or equal to 150%.
16 . The device according to claim 1 ,
wherein the first conductive layer is configured to serve as a touch sensor, and
wherein the display portion is configured to obtain positional data of a finger with the touch sensor and outputting the positional data to the control portion.
17 . The authentication method for an electronic device according to claim 9 , wherein the first image showing the first position to be touched to a user and the second image showing the second position to be touched to a user indicate different positions each time processing is performed.
18 . The authentication method for an electronic device according to claim 9 , wherein the first finger and the second finger specified in the first user authentication processing and the second user authentication processing are randomly changed each time user authentication processing is performed.
19 . The authentication method for an electronic device according to claim 9 , wherein, when the first finger touches a screen in the step of turning on the display element in the first region, a projected area of the first finger on the screen is larger than a contact area of the first finger.
20 . The authentication method for an electronic device according to claim 18 , wherein, when the second finger touches the screen in the step of turning on the display element in the second region, a projected area of the second finger on the screen is larger than a contact area of the second finger.