Light emitting device

Abstract

A light emitting device includes a substrate and a light emitting unit. The light emitting unit is over the substrate. The light emitting unit includes a light emitting subpixel and an electrode. The electrode is stacked on the light emitting subpixel along a direction. Moreover, the electrode includes a dimension measured perpendicular to the direction and the dimension is not greater than about 8 um.

1 . A light emitting device, comprising:
 a substrate; and   a light emitting unit over the substrate, wherein the light emitting unit includes:
 a light emitting subpixel; and 
 an electrode stacking on the light emitting subpixel along a vertical direction, the electrode including a width measured in a horizontal direction perpendicular to the vertical direction and the width is not greater than about 8 um. 
   
     
     
         2 . The light emitting device in  claim 1 , wherein the electrode is a cathode of the light emitting unit. 
     
     
         3 . The light emitting device in  claim 1 , further comprising an optical sensor adjacent to the light emitting unit and configured to detect emission intensity of the light emitting unit. 
     
     
         4 . The light emitting device in  claim 3 , further comprising an array of thin film transistors (TFT) under the light emitting unit and the optical sensor is electrically connected to the TFT. 
     
     
         5 . The light emitting device in  claim 1 , further comprising a stopper adjacent to the light emitting unit, wherein, along the vertical direction, the stopper has a thickness being greater than a thickness of the light emitting unit. 
     
     
         6 . The light emitting device in  claim 5 , further comprising a through via in the stopper. 
     
     
         7 . A light emitting device, comprising:
 a substrate; and   an array of light emitting units over the substrate, wherein each light emitting unit of the array includes:
 an electrode; and 
 a light emitting layer between the electrode and the substrate, wherein a horizontal width of the electrode is substantially equal to a horizontal width of the light emitting layer. 
   
     
     
         8 . The light emitting device in  claim 7 , further comprising an insulation material filling a space between adjacent light emitting units. 
     
     
         9 . The light emitting device in  claim 7 , further comprising a conductive trace to connect electrodes in a string. 
     
     
         10 . The light emitting device in  claim 7 , further comprising an array of optical sensors, wherein each of the optical sensors is assigned to a corresponding light emitting unit. 
     
     
         11 . The light emitting device in  claim 7 , further comprising an array of stoppers, wherein each stopper is between two adjacent light emitting units. 
     
     
         12 . The light emitting device in  claim 10 , further comprising a conductive trace electrically connecting each optical sensor to a circuit in the substrate. 
     
     
         13 . The light emitting device in  claim 7 , further comprising a touch sensor over the array of light emitting units, and an insulation layer between the touch sensor and the array of light emitting units. 
     
     
         14 . The light emitting device in  claim 13 , wherein the touch sensor is surrounded by a plurality of light emitting units from a top view perspective. 
     
     
         15 . The light emitting device in  claim 14 , wherein the touch sensor is laterally offset from the plurality of light emitting units from a top view perspective. 
     
     
         16 . The light emitting device in  claim 7 , further comprising an array of optical sensors over the array of light emitting units, wherein the array of optical sensors are configured to detect ambient light emitted into the light emitting device.