OLED Subpixel Circuit Overlap for Aperture Ratio
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Solution Overview
Problem
The aperture ratio of OLED display panels is reduced due to the large area occupied by control circuits, leading to decreased resolution, as existing designs often require pixel defining layers and metal layers to prevent circuit disconnection, which limits the space available for light emitting units.
Innovation Solution
The OLED array design features a white-light emitting sub-pixel positioned above other sub-pixels, with control circuits located within the orthogonal projection area of these sub-pixels, allowing for increased light emitting unit area and utilizing a top emission structure to optimize space, and includes a bottom-gate TFT with a semiconductor oxide layer for efficient light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control circuits are configured for each sub-pixel with pixel defining layers and metal layers to prevent circuit disconnection, then circuit reliability is improved, but the aperture ratio of the pixel is reduced
Solution Approach 1:
The patent merges the control circuits of multiple sub-pixels into a shared control circuit region. Instead of having separate control circuits for each sub-pixel, multiple sub-pixels share common control circuitry, which reduces the total area occupied by control circuits and increases the aperture ratio while maintaining circuit reliability through the shared architecture.
Solution Approach 2:
The shared control circuit serves multiple sub-pixels simultaneously, making it a multi-functional component. This universal control circuit design allows a single circuit structure to control multiple light-emitting units, reducing redundancy and optimizing the use of pixel area for light emission.
2Stability of the object's composition
If pixel defining layer materials and metal layers are added to keep storage capacitance and prevent disconnection, then circuit stability is improved, but the aperture ratio is reduced
Solution Approach 1:
By merging control circuits and sharing them across multiple sub-pixels, the patent reduces the total area required for control circuit components including pixel defining layers and metal layers. This consolidation maintains circuit stability through shared capacitive structures while freeing up pixel area for light emission.
Solution Approach 2:
The patent utilizes vertical stacking and three-dimensional arrangement of circuit components. By moving control circuits to different layers and using vertical interconnections, the design reduces the horizontal footprint of control circuit elements, thereby increasing the aperture ratio while maintaining circuit stability through proper layer configuration.
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 configuration enhances the aperture ratio and maintains display resolution while reducing power consumption by incorporating a white-light emitting sub-pixel that replaces colored light, effectively managing color gamut and power usage.
Implementation Method 1
OLED devices present excellent characteristics, such as a low power consumption, a high color saturation, a wide viewing angle, a thin thickness and being available for flexible display
Data Source
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AI summary
An organic light emitting diode (OLED) display array substrate, a manufacturing method of the same OLED structure and a display apparatus. The OLED array substrate includes a plurality of pixels (200) arranged in an array on a base substrate. Further, each pixel (200) comprises a first sub-pixel (210a) and a second sub-pixel (210b) displaying different colors. Each sub-pixel (210) comprises a light emitting unit (211) and a control circuit (212). In addition, an orthogonal projection of the light emitting unit (211a) of the first sub-pixel (210a) on the base substrate overlaps with an orthogonal projection of the control circuit (212b) of the second sub-pixel (210b) on the base substrate. According to the OLED display structure of the present disclosure, the region occupied by the control circuit (212b) of a second sub-pixel (210b) is used to set up the light emitting unit (211a) of the first sub-pixel (210a). This can increase the display surface area occupied by the light emitting units in each pixel, thus improve the resolution of the display.