Aging Voltage Supply Lines for OLED Leakage Current Reduction
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Solution Overview
Problem
Organic light emitting display devices face issues with non-uniform luminance due to leakage currents in thin film transistors (TFTs), leading to bright spots or lines on non-operational screens, and existing aging methods affect other TFTs, increasing the risk of defects.
Innovation Solution
The introduction of aging voltage supply lines directly connected to the gate and drain electrodes of the driving TFT, allowing for targeted aging without affecting other TFTs, thereby reducing leakage currents and preventing defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional aging methods are used to reduce leakage currents in TFTs, then leakage current is reduced, but other TFTs are also affected which increases the risk of defects
Solution Approach 1:
The patent introduces separate aging voltage supply lines (first aging voltage supply line connected to gate electrode, second aging voltage supply line connected to drain electrode) that are independent from the normal driving signal lines. This segmentation allows aging voltage to be applied specifically to the driving TFT without affecting other TFTs through the shared signal lines, thus reducing leakage current while minimizing defect risk in other components.
Solution Approach 2:
The aging voltage is applied locally and specifically to the driving TFT through dedicated aging voltage supply lines, rather than globally affecting all TFTs in the display device. The first aging voltage supply line applies voltage to the gate electrode and the second to the drain electrode, creating a localized aging effect precisely where needed without propagating harmful effects to other TFTs.
2Reliability
If aging voltage is applied to reduce leakage currents, then image quality deterioration is prevented, but the device complexity increases due to additional aging voltage supply lines
Solution Approach 1:
The aging voltage supply system is segmented into two independent lines: the first aging voltage supply line connected to the gate electrode and the second aging voltage supply line connected to the drain electrode. This segmented approach allows precise control of aging voltage application while keeping each line simple and dedicated, balancing the need for image quality stability with acceptable device complexity.
Data Source
AI summary
The present disclosure relates to an organic light emitting display device and a method of fabricating the same. The organic light emitting display device comprises a first substrate including a plurality of sub-pixels; a thin film transistor in each of the plurality of sub-pixels and on the first substrate; an organic light emitting diode in each of the plurality of sub-pixels and on the first substrate; and an aging voltage supply line extending from a lower surface of the first substrate to a portion of the thin film transistor and supplying an aging voltage to the thin film transistor.