OLED Subpixel Sensing Environment Defect Detection
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Solution Overview
Problem
Organic light emitting display devices face image abnormalities due to degradation of circuit elements in subpixels, leading to inaccurate sensing and compensation of characteristic values, which can result in defects during the sensing and compensation process.
Innovation Solution
An organic light emitting display device with a sensing unit and a controller that includes a sensing control unit to detect defects in the sensing environment by comparing feedback signals with predesignated response signals, controlling the sensing process, and generating compensation data based on accurate sensing data to prevent image abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensing and compensation is performed for circuit element degradation, then image quality is improved, but sensing errors occur leading to defects
Solution Approach 1:
The patent applies preliminary action by performing a sensing environment check before conducting the actual sensing and compensation operation. The controller verifies whether the sensing unit can normally sense characteristic values by checking if sensed data falls within predetermined reference ranges. This preliminary verification prevents erroneous sensing data from being used in compensation calculations, thereby resolving the contradiction between improving image quality through sensing/compensation and avoiding sensing errors that cause defects.
2Measurement precision
If sensing operation is continuously performed, then compensation accuracy is improved, but sensing defects increase due to environmental errors
Solution Approach 1:
The patent implements feedback by having the controller check the sensed characteristic values against predetermined reference ranges and use this feedback to determine whether to proceed with compensation. When sensed values fall outside reference ranges, the controller identifies this as a sensing environment defect and prevents erroneous compensation. This feedback mechanism resolves the contradiction by enabling continuous sensing operations while filtering out defective sensing data that would otherwise increase defect rates.
3Productivity
If sensing data is used for compensation without verification, then processing speed is improved, but image abnormalities occur due to erroneous data
Solution Approach 1:
The patent applies preliminary action by verifying sensing data against reference ranges before using it for compensation calculations. This preliminary check ensures that only valid sensing data within expected parameter ranges is used, preventing image abnormalities caused by erroneous data. The verification step maintains processing efficiency by using predetermined reference ranges for quick comparison while ensuring image quality through data validation.
Data Source
AI summary
The present disclosure relates to an organic light emitting display device that performs sensing and compensation for a characteristic value of a subpixel, and provide the organic light emitting display device that detects whether a sensing environment has a defect via transceiving a signal between a controller and a data driver before sensing is performed in a period in which the characteristic value of the subpixel is sensed, and controls sensing of the characteristic value of the subpixel according to detection of whether the sensing environment has a defect. According to the present disclosure, an error of sensing data due to a defect in the sensing environment may be prevented and an image abnormality due to compensation performed based on erroneous sensing data may be prevented, by detecting a defect in the sensing environment and stopping sensing of the characteristic value of the subpixel when the sensing environment has a defect.