Auxiliary Line Discharge for OLED Pixel Repair
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Solution Overview
Problem
During the manufacturing of organic light emitting display devices, defects in transistors lead to reduced manufacturing yield and can cause auxiliary pixels to erroneously emit light due to parasitic capacitance and fringe capacitance affecting the auxiliary lines.
Innovation Solution
The auxiliary line is discharged with a first power voltage using a discharge transistor to prevent voltage variations caused by parasitic and fringe capacitance, ensuring proper operation of the organic light emitting diodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If auxiliary pixels are added to compensate for defective pixels, then manufacturing yield is improved, but parasitic capacitance and fringe capacitance cause erroneous light emission from auxiliary pixels
Solution Approach 1:
The patent applies preliminary action by discharging the auxiliary line with a first power voltage before the auxiliary pixel operates. This pre-discharge operation removes accumulated parasitic and fringe capacitance from the auxiliary line, preventing erroneous light emission when the auxiliary pixel is activated to compensate for defective pixels.
Solution Approach 2:
The patent extracts and removes the harmful capacitance effect by introducing a discharge transistor that actively discharges the auxiliary line. This separates the harmful capacitance accumulation from the auxiliary pixel operation, allowing the auxiliary pixel to function correctly without being affected by parasitic and fringe capacitance.
2Reliability
If discharge transistor is used to prevent voltage variations on auxiliary line, then reliability is improved, but device complexity increases
Solution Approach 1:
The discharge transistor is configured to automatically discharge the auxiliary line based on voltage conditions without requiring external control signals. The transistor self-activates when voltage variations occur on the auxiliary line, providing self-service functionality that maintains voltage stability without adding complex control circuitry.
Data Source
AI summary
An organic light emitting display device includes display pixels, auxiliary pixels, and a plurality of signal lines. The signal lines include data lines, auxiliary data lines, scan lines, and emission control lines. The auxiliary pixels are to be used for repairing defective ones of the display pixels. In operation, scan signals are supplied in a unit of p scan lines, A emission control signals are to be supplied in a unit of p A emission control lines, and B emission control signals are to be supplied in a unit of p B emission control lines, where p≧2.