OLED Pixel Circuit Layout for Seamless Boundary Luminance
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Solution Overview
Problem
The challenge of reducing the magnitude of the peripheral area in display devices while maintaining high resolution and high-speed driving is hindered by the increased area occupied by the driving unit, making it difficult to expand the display area.
Innovation Solution
A light emitting display device design that includes pixels with varying boost capacitor capacitance values and transistor sizes, with a third pixel at the boundary area having a larger boost capacitor and transistor, allowing the light-emitting elements to be positioned on the driving unit, thus expanding the display area without visible boundaries between display areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the display area is expanded by positioning light-emitting elements on the driving unit, then the display area is extended, but the boundary between display areas becomes recognizable
Solution Approach 1:
The patent applies local quality by differentiating the capacitance values of boost capacitors based on their position. Pixels at boundary regions (third pixels) are assigned a different capacitance value (greater than) compared to pixels in normal display areas (first and second pixels). This localized parameter adjustment ensures uniform luminance across the expanded display area, preventing visible boundaries while maintaining area expansion.
2Measurement precision
If the driving unit area increases to achieve high resolution and speed, then the display quality is improved, but the peripheral area cannot be reduced
Solution Approach 1:
The patent utilizes another dimension by positioning light-emitting elements vertically above the driving unit in a stacked configuration. This three-dimensional arrangement allows the display area to extend into the space above the driving circuitry, effectively increasing the display area without expanding the peripheral footprint, while maintaining high resolution through precise positioning of the light-emitting elements.
Data Source
AI summary
A light emitting display device includes a first pixel positioned in a first display area, the first pixel including a first driving circuit part including a first boost capacitor, and a first driving transistor, and a first light-emitting element; a second pixel positioned in a second display area, the second pixel including a second driving circuit part including a second boost capacitor, and a second driving transistor, and a second light-emitting element; and a third pixel positioned in a third display area positioned at a boundary part of the first display area and the second display area, the third pixel including a third driving circuit part including a third boost capacitor, and a third driving transistor, and a third light-emitting element, wherein the first boost capacitor, the second boost capacitor, and the third boost capacitor have different capacitance values.