OLED Display Transistor Orientation for Laser Crystallization Stains
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Solution Overview
Problem
The production of organic light emitting diode (OLED) display devices faces issues with striped stains due to output nonuniformity of oscillation laser beams during the crystallization of polycrystalline silicon layers, which affects crystal uniformity and manufacturing productivity.
Innovation Solution
The semiconductor layers of driving transistors in adjacent pixels are formed to extend in different lengthwise directions, reducing the variance in electron mobility and thereby minimizing striped stains, while maintaining manufacturing efficiency by irradiating laser beams parallel to the substrate surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If laser beams are used to crystallize polycrystalline silicon layers, then manufacturing productivity is improved, but striped stains are generated due to output nonuniformity of oscillation laser beams
Solution Approach 1:
The patent applies asymmetry by forming semiconductor layers of driving transistors in adjacent pixels to extend in different lengthwise directions (different orientations). This asymmetric arrangement ensures that laser beam output nonuniformity affects adjacent pixels differently, thereby minimizing the appearance of striped stains while maintaining high manufacturing productivity through laser crystallization.
2Manufacturing precision
If semiconductor layers of driving transistors in adjacent pixels are formed to extend in different lengthwise directions, then striped stains are reduced, but device complexity increases
Solution Approach 1:
The patent applies local quality by varying the orientation of semiconductor layers only in specific local regions (adjacent pixels have different lengthwise directions), while maintaining the overall uniformity of the display device structure. This localized variation reduces striped stains without requiring fundamental changes to the entire device architecture, thus limiting the increase in device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces striped stains caused by laser beam nonuniformity without degrading manufacturing productivity, ensuring consistent luminance and reducing the complexity of pixel circuits.
Implementation Method 1
The semiconductor layers of the TFTs may be formed by crystallizing amorphous silicon (a-Si) into polycrystalline silicon (poly-Si) using laser beams.
Implementation Method 2
crystallizing amorphous silicon (a-Si) into polycrystalline silicon (poly-Si) using laser beams
Data Source
AI summary
An organic light emitting diode (OLED) display device and a method of fabricating the same is provided. Semiconductor layers of driving transistors located in two adjacent pixels included in the OLED display device may extend in different lengthwise directions. Thus, striped stains of the OLED display device can be improved.