Display Device Pixel Compensation Verification
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Solution Overview
Problem
Display devices face challenges in maintaining image quality due to degradation of pixels over time, particularly in light emitting elements and driving transistors, which affects the accuracy of external compensation techniques.
Innovation Solution
A display device and driving method that includes a data driver, sensing unit, and timing controller to improve image quality by accurately sensing and compensating for pixel characteristics through a sensing period and verification periods, using different data voltages to detect compensation degrees and adjust image data accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external compensation is performed using sensing circuits, then pixel degradation can be compensated, but measurement precision is insufficient leading to inaccurate compensation
Solution Approach 1:
The patent applies preliminary action by performing sensing operations before the actual display operation. Multiple sensing periods are conducted to measure pixel characteristics (threshold voltage, mobility) before compensation is applied. This allows the system to capture accurate baseline data for compensation calculations, ensuring that degradation parameters are measured before they affect display quality.
Solution Approach 2:
The patent implements feedback by using verification periods to check the accuracy of compensation after it has been applied. The sensing unit measures pixel characteristics again during verification periods, and the timing controller compares these measurements with expected values to determine if compensation was successful. This closed-loop feedback mechanism allows the system to iteratively improve compensation accuracy.
2Measurement precision
If multiple sensing periods are performed to verify compensation accuracy, then compensation degree can be checked, but time consumption increases
Solution Approach 1:
The patent applies periodic action by organizing sensing and verification operations into distinct time periods within the display refresh cycle. Sensing periods are allocated at specific intervals to measure pixel characteristics, followed by verification periods to check compensation accuracy. This periodic structure allows multiple measurements to be performed systematically without requiring continuous sensing, optimizing the balance between verification accuracy and time consumption.
3Measurement precision
If different data voltages are supplied during sensing and verification periods, then compensation degree can be detected accurately, but device complexity increases
Solution Approach 1:
The patent applies dynamics by making the data driver capable of dynamically switching between different data voltages based on the operational period. During sensing periods, the data driver supplies first data voltages optimized for sensing operations. During verification periods, it supplies second data voltages optimized for verification. This dynamic voltage adjustment allows the system to optimize measurement accuracy for each phase while using a single versatile data driver circuit.
Data Source
AI summary
A display device includes: a pixel including a light emitting element and a first transistor for applying a driving current to the light emitting element; a data driver for supplying a first data voltage corresponding to first sensing data to the pixel in a sensing period, and supplying, to the pixel, a second data voltage corresponding to second sensing data or a third data voltage corresponding to third sensing data in a verification period for detecting compensation degree of the sensing period; a sensing unit for extracting a first sensing value corresponding to the first sensing data, a second sensing value corresponding to the second sensing data, and a third sensing value corresponding to the third sensing data through sensing lines; and a timing controller for generating image data compensated using the first sensing value, and detecting the compensation degree using the second sensing value or the third sensing value.