EMISSION CONTROL IN AGED ACTIVE MATRIX OLED DISPLAY USING VOLTAGE RATIO OR CURRENT RATIO
First Claim
Patent Images
1. A method of determining compensation needed for reduced light efficiency in aged sub-pixels of an active matrix organic light-emitting diode (OLED) display, the method comprising:
- aging a plurality of sections of sub-pixels of a first active matrix OLED display, the sections including at least a first section including aged sub-pixels and a second section including reference sub-pixels that are not aged;
applying a predetermined voltage across one or more of the aged sub-pixels and one or more of the reference sub-pixels;
determining a first current through said one or more of the aged sub-pixels and a second current through said one or more of the reference sub-pixels;
determining an age of said one or more of the aged sub-pixels based on the first current relative to the second current;
determining light emission characteristics of said one or more of the aged sub-pixels; and
determining corrections to be made to digital numbers indicative of desired brightness in said one or more of the aged sub-pixels based on mappings between the determined age and the determined light emission characteristics of said one or more of the aged sub-pixels.
1 Assignment
0 Petitions
Accused Products
Abstract
Compensation needed to be made for reduced light efficiency in aged sub-pixels of an active matrix organic light-emitting diode (OLED) display are determined using a current ratio or a voltage ratio pertaining to an aged sub-pixel relative to un-aged, reference sub-pixels.
115 Citations
23 Claims
-
1. A method of determining compensation needed for reduced light efficiency in aged sub-pixels of an active matrix organic light-emitting diode (OLED) display, the method comprising:
-
aging a plurality of sections of sub-pixels of a first active matrix OLED display, the sections including at least a first section including aged sub-pixels and a second section including reference sub-pixels that are not aged; applying a predetermined voltage across one or more of the aged sub-pixels and one or more of the reference sub-pixels; determining a first current through said one or more of the aged sub-pixels and a second current through said one or more of the reference sub-pixels; determining an age of said one or more of the aged sub-pixels based on the first current relative to the second current; determining light emission characteristics of said one or more of the aged sub-pixels; and determining corrections to be made to digital numbers indicative of desired brightness in said one or more of the aged sub-pixels based on mappings between the determined age and the determined light emission characteristics of said one or more of the aged sub-pixels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A method of determining compensation needed for reduced light efficiency in aged sub-pixels of an active matrix organic light-emitting diode (OLED) display, the method comprising:
-
aging a plurality of sections of sub-pixels of a first active matrix OLED display, the sections including at least a first section including aged sub-pixels and a second section including reference sub-pixels that are not aged; determining a first voltage applied to one or more of the aged sub-pixels to generate a predetermined reference current through said one or more of the aged sub-pixels; determining a second voltage applied to one or more of the reference sub-pixels to generate the same predetermined reference current through said one or more of the reference sub-pixels; determining an age of said one or more of the aged sub-pixels based on the first voltage relative to the second voltage; determining light emission characteristics of said one or more of the aged sub-pixels; determining corrections to be made to digital numbers indicative of desired brightness in said one or more of the aged sub-pixels based on mappings between the determined age and the determined light emission characteristics of said one or more of the aged sub-pixels. - View Dependent Claims (11, 12, 13, 14, 16, 17, 18)
-
-
15. The method of claim 15, further comprising storing a mapping between the voltage ratio and the age of the aged sub-pixel in a selection look-up table.
-
19. An active matrix organic light-emitting diode (OLED) display comprising:
-
a plurality of OLED elements arranged in a plurality of rows and a plurality of columns, each of the OLED elements corresponding to a sub-pixel of the OLED display; and an active matrix drive circuit configured to drive current through the OLED elements, the active matrix drive circuit including; a plurality of age curve look-up tables each corresponding to a different age of aged sub-pixels of the OLED display and mapping digital numbers to corrections to be made to the digital numbers for the corresponding age of the aged sub-pixel, one or more of the aged sub-pixels of the OLED display being assigned to use said one of the age curve look-up tables for correction of the digital numbers; a correction look-up table storing mappings between each of the OLED sub-pixels and said assigned one of the age curve look-up tables; and a selection look-up table storing mappings between ages of the sub-pixels of the OLED display and the age curve look-up tables, the ages of the sub-pixels represented by current ratios or voltage ratios associated with the sub-pixels of the OLED display, and wherein the active matrix drive circuit is configured to receive the digital number indicative of a desired brightness of one of the aged sub-pixels and generate a corrected digital number for driving the OLED elements using the corrections to the digital numbers stored in the age curve look-up table assigned to said one of the aged sub-pixels. - View Dependent Claims (20, 21, 22, 23)
-
Specification