OLED Display Sensing Error Correction via Line Replacement
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Solution Overview
Problem
Organic light emitting diode (OLED) display devices face issues with sensing errors due to defects in sensing lines or circuits, leading to non-uniform luminance and operational failures, as they struggle to accurately detect and correct sensing data errors.
Innovation Solution
A method is introduced that performs a one-line sensing operation to detect sensing errors, followed by a frame-sensing operation to identify abnormal sensing-data lines, which are then replaced with adjacent data lines to generate accurate sensing data, ensuring uniform luminance and normal device operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a frame-sensing operation is performed for all pixels without preliminary error detection, then sensing data is obtained for luminance compensation, but sensing errors from defective lines or circuits cause operational failures or non-uniform luminance
Solution Approach 1:
The patent applies preliminary action by performing a one-line sensing operation before the frame-sensing operation to detect sensing errors in advance. The controller executes a test voltage pattern on a specific line, compares the output with expected values, and identifies defective sensing lines before conducting the full frame-sensing operation, thereby preventing sensing errors from compromising the entire sensing process
Solution Approach 2:
The patent segments the sensing operation into two distinct phases: a preliminary one-line sensing operation for error detection and a subsequent frame-sensing operation for comprehensive data collection. This segmentation allows the system to isolate and handle sensing errors in specific lines without affecting the entire sensing process, improving reliability while maintaining manageable complexity
2Measurement precision
If sensing errors are not detected and corrected, then the sensing operation completes quickly, but the display exhibits non-uniform luminance or operational failures
Solution Approach 1:
The patent implements feedback by having the controller compare the output voltage pattern from the one-line sensing operation with the expected test voltage pattern, detect deviations indicating sensing errors, and use this feedback information to determine whether to proceed with the frame-sensing operation or to perform error correction, thereby ensuring sensing data accuracy
Solution Approach 2:
The patent uses copying by creating a test voltage pattern as a reference copy of what the sensing operation should produce under normal conditions. By comparing the actual output against this reference pattern, the system can identify sensing errors without requiring additional physical sensing operations, maintaining efficiency while improving accuracy
3Reliability
If abnormal sensing-data lines are not replaced, then data processing is simpler, but pixels driven by erroneous data lines exhibit excessively high or low luminance
Solution Approach 1:
The patent introduces an intermediary process where the controller acts as a mediator between the sensing operation and the luminance compensation process. It detects abnormal sensing-data lines, replaces them with corrected data, and then uses this corrected data for driving transistors, thereby ensuring luminance uniformity without requiring changes to the physical display structure
Solution Approach 2:
The patent applies parameter changes by modifying the sensing data parameters - specifically replacing erroneous sensing data values with corrected values derived from adjacent lines or recalculated data. This parameter correction ensures that the driving transistors receive accurate compensation values, resulting in uniform luminance across all pixels
Data Source
AI summary
There is provided a method of performing a sensing operation in an organic light emitting diode (OLED) display device including a plurality of pixels, the method including performing a one-line sensing operation for pixels in one line among the plurality of pixels, determining whether a sensing error occurs based on a result of the one-line sensing operation, when the sensing error is determined not to occur, performing a frame-sensing operation for all of the plurality of pixels, detecting an abnormal sensing-data line from among frame-sensing data generated by the frame-sensing operation, and replacing the abnormal sensing-data line by a data line generated based on at least one sensing-data line that is adjacent to the abnormal sensing-data line in the frame-sensing data.