LED Display Pixel Circuit Layout With Dummy Openings for TFT Uniformity
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Solution Overview
Problem
Light emitting display devices using inorganic LEDs face issues with non-uniform characteristics of thin film transistors due to hydrogen accumulation, which can lead to performance variations across different positions and under varying environmental conditions, especially in outdoor environments with temperature changes and moisture exposure.
Innovation Solution
The implementation of a dummy opening in regions where the pixel circuit unit and signal generating units are not positioned, allowing for uniform semiconductor layer formation and preventing hydrogen accumulation, thereby ensuring consistent transistor characteristics across the display device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a light emitting display device uses inorganic LEDs without encapsulation layers, then it can be used in outdoor environments with high or low temperatures and moisture, but thin film transistors exhibit non-uniform characteristics due to hydrogen accumulation
Solution Approach 1:
The patent introduces dummy openings in specific regions where pixel circuit units and signal generating units are not positioned. This creates local structural differences - the dummy openings are strategically placed in areas that would otherwise be solid substrate, allowing hydrogen to be released from those specific locations without affecting the functional areas. This local modification resolves the hydrogen accumulation problem while maintaining the outdoor environment adaptability of inorganic LEDs.
2Adaptability or versatility
If the display device operates in outdoor environments with temperature changes, then it can be used in various conditions, but thin film transistor characteristics deteriorate due to environmental factors
Solution Approach 1:
The dummy openings are formed during the manufacturing process before the device is deployed to outdoor environments. This preliminary structural preparation creates escape paths for hydrogen that would otherwise accumulate and cause performance degradation. By pre-configuring these openings, the device is prepared in advance to handle environmental stressors like temperature changes and moisture exposure, maintaining transistor performance stability throughout its operational life.
Data Source
AI summary
A light emitting display device includes a pixel circuit unit, a data distribution unit, a plurality of signal generating units, a unit light emitting diode, and a dummy opening. The pixel circuit unit is configured to generate an output current. The data distribution unit is configured to apply a data voltage to the pixel circuit unit through a data line. The plurality of signal generating units are respectively configured to apply a scan signal and a light emission control signal to the pixel circuit unit through a plurality of signal lines. The unit light emitting diode is configured to receive the output current of the pixel circuit unit and is attached to the pixel circuit unit. The dummy opening is formed in the region where the pixel circuit unit, the data distribution unit, and a plurality of signal generating units are not positioned.