Method and device for current compensation for an electroluminescent display

Abstract

A method for current compensation in an electroluminescent (EL) display is provided. The method includes measuring an intensity of light of a pixel unit, identifying a pixel unit to be one that needs compensation if the measured intensity exceeds a predetermined threshold, determining the magnitude of a compensation current, and providing an image data corresponding to the magnitude of the compensation current to the identified pixel unit.

What is claimed is: 
     
         1 . A method for current compensation in an electroluminescent (EL) display, the method comprising:
 measuring an intensity of light of a pixel unit;   identifying a pixel unit to be one that needs compensation if the measured intensity exceeds a predetermined threshold;   determining the magnitude of a compensation current; and   providing an image data corresponding to the magnitude of the compensation current to the identified pixel unit.   
     
     
         2 . The method according to  claim 1  further comprising:
 providing an image data of a predetermined grayscale to a pixel unit under measurement before measuring an intensity of light of the pixel unit. 
 
     
     
         3 . The method according to  claim 2 , wherein identifying a pixel unit further comprises:
 comparing the measured intensity with the predetermined grayscale.   
     
     
         4 . The method according to  claim 2 , wherein determining the magnitude of a compensation current further comprises:
 calculating a difference between the measured intensity and the predetermined grayscale; and   converting the difference into the magnitude of a compensation current.   
     
     
         5 . The method according to  claim 1  further comprising:
 determining the location of the identified pixel unit. 
 
     
     
         6 . The method according to  claim 5 , wherein the pixel unit is driven by a gate driver integrated circuit (IC) and a source driver IC, further comprising:
 providing information on the location of the identified pixel unit to the gate driver IC; and   providing information on the magnitude of a compensation current to the source driver IC.   
     
     
         7 . A method for current compensation, the method comprising:
 obtaining real-time image data on mura of a display of a mobile device;   storing the real-time image data on mura in a memory of the mobile device; and   determining pixels that need compensation based on the real-time image data on mura.   
     
     
         8 . The method according to  claim 7 , wherein obtaining real-time image data on mura of a display of a mobile device comprises:
 taking a picture of an image displayed by the display of the mobile device.   
     
     
         9 . The method according to  claim 7  further comprising:
 updating in the memory an original image data on mura with the real-time image data on mura. 
 
     
     
         10 . The method according to  claim 9 , wherein the original image data on mura is stored in the memory when the mobile device is manufactured. 
     
     
         11 . The method according to  claim 9 , wherein the original image data on mura includes a previously stored image data on mura. 
     
     
         12 . The method according to  claim 7 , wherein the memory includes a flash IC. 
     
     
         13 . An electroluminescent (EL) display, comprising:
 a substrate;   an EL device layer over the substrate, the EL device layer including a number of EL devices; and   an optical sensor layer over the substrate, the optical sensor layer including first sensors arranged in a first direction and second sensors arranged in a second direction, the first sensors and the second sensors intersecting one another at intersection points,   wherein the optical sensor layer is configured to identify a region of the EL device layer for compensation by detecting impedance at each intersection point from a reference point.   
     
     
         14 . The EL display according to  claim 13 , wherein the substrate includes one of a low temperature polysilicon (LTPS) substrate and an indium gallium zinc oxide (IGZO) substrate. 
     
     
         15 . The EL display according to  claim 13 , wherein the EL device includes one of an organic light emitting diode (OLED), a micro LED and a quantum dot LED (QLED). 
     
     
         16 . The EL display according to  claim 13 , wherein the optical sensor layer has a same size as the substrate. 
     
     
         17 . The EL display according to  claim 13 , wherein the optical sensor layer  33  is made of a relatively high transparent material. 
     
     
         18 . The EL display according to  claim 13  further comprising a measuring module configured to measure an intensity of light of an EL device. 
     
     
         18 . EL display according to  claim 18  further comprising an analyzing module configured to identify an EL device to be one that needs compensation if the measured intensity exceeds a predetermined threshold. 
     
     
         20 . The EL display according to claim  19  further comprising a calculating module configured to determine the magnitude of a compensation current for the identified EL device.