Display device and image sensing method thereof

Abstract

The invention relates to a display device, applicable to fingerprint image recognition. The display device includes: a substrate, a cover panel, and unit pixels. First, the unit pixels on the display device emit light alternately. When a part of the unit pixels emit light, defined as in a light-emitting state, and when another part of the unit pixels do not emit light, defined as in a sensing state; then, the unit pixels in the light-emitting state are used as the light-emitting area; the unit pixels in the sensing state are used as the sensing area; the unit pixels in the light-emitting area emit incident light to and reflected by a test object; the unit pixels in the sensing area sense the reflected light, and generates an image electrical signal. Therefore, the display device can be used as both a light-emitting element and a sensing element for fingerprint image recognition.

What is claimed is: 
     
         1 . A display device, applicable to an environment for sensing fingerprint images, comprising:
 a substrate, having an upper surface and a lower surface;   a cover panel, disposed on the upper surface of the substrate; and   a plurality of unit pixels, disposed on the substrate, the unit pixels comprising a plurality of red unit pixels, a plurality of green unit pixels, and a plurality of blue unit pixels, wherein the red unit pixels emitting a red incident light, the green unit pixels emitting a green incident light, and the blue unit pixels emitting a blue incident light;   wherein, the unit pixels on the display device emitting light alternately; and when a part of the unit pixels emitting light, defined as in a light-emitting state, when the other part of the unit pixels not emitting light, defined as in a sensing state, the unit pixels in the light-emitting state being regarded as a light-emitting area, and the unit pixels in the sensing state being regarded as a sensing area, a part of the unit pixels in the light-emitting area emitting an incident light to a test object, the test object reflecting the incident light to generate a reflected light, and a part of the unit pixels in the sensing area receiving the reflected light to generate an image electrical signal.   
     
     
         2 . The display device according to  claim 1 , wherein the display device is an organic light-emitting diode display device. 
     
     
         3 . The display device according to  claim 1 , wherein the light-emitting area comprises only the blue unit pixels of the plurality of unit pixels. 
     
     
         4 . The display device according to  claim 1 , wherein the sensing area comprises one or a combination of the red unit pixels and the green unit pixels of the plurality of unit pixels. 
     
     
         5 . The display device according to  claim 1 , wherein the plurality of unit pixels are disposed between the upper surface of the substrate and the cover panel. 
     
     
         6 . The display device according to  claim 1 , wherein the plurality of unit pixels are disposed on the lower surface of the substrate. 
     
     
         7 . The display device according to  claim 1 , wherein the display device further comprises a readout circuit coupled to each of the unit pixels, and the readout circuit receives the image electrical signal to generate a corresponding image information. 
     
     
         8 . An image sensing method, comprising the following steps of:
 a definition step: a plurality of unit pixels on a display device emitting light alternately; when a part of the unit pixels emitting light, these unit pixels being defined as in a light-emitting state, and when another part of the unit pixels not emitting light, these unit pixels being defined as in a sensing state;   a light-emitting area step: the unit pixels in the light-emitting state being used as a light-emitting area;   a sensing area step: the unit pixels in the sensing state being used as a sensing area;   an emission step: a part of the unit pixels in the light-emitting area emitting an incident light to a test object, and the incident light emitted to the test object being reflected to generate a reflected light;   a sensing step: a part of the unit pixels in the sensing area sensing the reflected light, and the sensing area generating a corresponding image electrical signal.   
     
     
         9 . The image sensing method according to  claim 8 , wherein the display device is one of an organic light-emitting diode display device and a micro light-emitting diode display device. 
     
     
         10 . The image sensing method according to  claim 8 , wherein the light-emitting area comprises only a plurality of blue unit pixels of the plurality of unit pixels. 
     
     
         11 . The image sensing method according to  claim 8 , wherein the sensing area comprises one or a combination of a plurality of red unit pixels and a plurality of green unit pixels of the plurality of unit pixels.