LIFETIME UNIFORMITY PARAMETER EXTRACTION METHODS
First Claim
1. A method of evaluating OLED display pixel status comprising:
- generating a sequence of patterns representing pixel values for a display panel, wherein the sequence of patterns is a subset of a full sequence of patterns;
driving the OLED panel with the sequence of patterns;
sensing a sequence of values representing the responses of the panel to the respective ones of the sequence of patterns;
deriving from the sensed sequence of values a matrix of status values representing pixel status of the panel; and
storing the matrix of status values in a memory.
2 Assignments
0 Petitions
Accused Products
Abstract
A system and method for deriving a sequence of OLED non-uniformity test patterns. A pattern generator generates a full sequence of display patterns according to a transform function, such as a discrete cosine transformation or wavelet transformation. A driver drives a display with each of the sequence of patterns. A sensor senses a property of the display, such as a total current for the display, for each of the sequence of patterns. An extraction unit derives a pixel non-uniformity model using the sensed properties and an inverse of the transform function. Patterns that contribute less than a threshold amount to the non-uniformity model can be identified and deleted to derive a sparse sequence of patterns, which can be stored in a memory. The sparse sequence of patterns can be used to test the display and extract a set of pixel non-uniformity values. The pixel non-uniformity values can be used to generate a correction signal for the display.
278 Citations
28 Claims
-
1. A method of evaluating OLED display pixel status comprising:
-
generating a sequence of patterns representing pixel values for a display panel, wherein the sequence of patterns is a subset of a full sequence of patterns; driving the OLED panel with the sequence of patterns; sensing a sequence of values representing the responses of the panel to the respective ones of the sequence of patterns; deriving from the sensed sequence of values a matrix of status values representing pixel status of the panel; and storing the matrix of status values in a memory. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. An apparatus for evaluating OLED display status, comprising:
-
a pattern generator configured to generate a sequence of pixel patterns, wherein the sequence of patterns is a subset of a full sequence of patterns; a pixel driver coupled to the pattern generator configured to drive a display panel with the sequence of pixel patterns generated by the pattern generator; a sensor configured to sense a panel response value corresponding to a pattern generated by the pattern generator; an extraction module coupled to the sensor configured to extract a set of status values corresponding to each of the pixels of the panel from the panel response values; and a memory configured to store the set of status values. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
-
-
20. The apparatus of claim 12, wherein
the pixel driver is further configured to alternately drive the pixel driving transistors in a first operating position and a second operating position; -
the sequence of patterns includes patterns corresponding to each of the first operating position and the second operating position; and the extraction module is further configured to extract status values representative of two discrete display characteristics. - View Dependent Claims (21, 22, 28)
-
-
20-1. (canceled)
-
23. A method of deriving a sequence of OLED status test patterns comprising:
-
generating a full sequence of display patterns according to a transform function; driving a display with each of the sequence of patterns; sensing a property of the display for each of the sequence of patterns; deriving a pixel status model using the sensed properties and an inverse of the transform function; identifying and deleting patterns of the sequence of patterns that contribute less than a threshold amount to the status model to derive a sparse sequence of patterns; storing the sparse sequence of patterns in a memory. - View Dependent Claims (24, 25, 26, 27)
-
Specification