Analysis and characterization of self-compensating current programmed a-Si:H active matrix organic light-emitting diode pixel circuits
Bibliographic record
Abstract
The organic light-emitting diode (OLED) drive current provided by a simple 2 thin film transistor (TFT) hydrogenated amorphous silicon (a-Si:H) active matrix OLED (AMOLED) voltage programmed pixel circuit drops over time due to threshold voltage (VT) increase in the drive TFT. VT shift compensating current programmed 4-TFT circuits have been developed to overcome this problem and to keep the drive current constant, thereby prolonging the life of the display. In this article, we present a thorough analysis of the static and dynamic operation of such circuits and derive theoretical limits for the extent of compensation. Measurement results of circuit characteristics and stability are presented which demonstrate that it is feasible to use a-Si:H for AMOLED back planes. The advantages and drawbacks of current programmed circuits are also outlined from the perspective of active matrix back-plane design.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".