OLED Substrate IC Overlap Layout for Compact Light-Emitting Panels
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Solution Overview
Problem
Existing light-emitting devices using OLED elements face challenges in reducing the substrate area and manufacturing costs due to the arrangement of ICs and the complexity of wiring, which increases the frame area and costs, and complicates the manufacturing process.
Innovation Solution
The solution involves mounting integrated circuit chips on the substrate in a way that they overlap the light emission region, allowing for a reduction in substrate area, using anisotropic conductive films for fixation, and arranging wiring lines to avoid intersections with the common cathode line, simplifying the layout and reducing stray capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If ICs are arranged on the substrate in a region other than the IC region, then the substrate area increases, but the manufacturing tolerance requirements increase
Solution Approach 1:
The patent applies dimensionality change by allowing the IC to overlap with the light emission region in the vertical dimension, rather than arranging it strictly in the planar dimension. This overlapping arrangement in the thickness direction enables space utilization that reduces the required substrate area while avoiding the tolerance issues associated with lateral placement in non-IC regions.
Solution Approach 2:
The IC is positioned within the boundary of the light emission region, creating a nested configuration where the IC occupies space in the vertical dimension above the light emission region rather than requiring additional lateral space. This nesting approach allows the IC to be housed within the existing light emission region footprint, reducing the overall substrate area requirement.
2Adaptability or versatility
If ICs are mounted on an FPC, then the wiring complexity increases, but the mounting flexibility improves
Solution Approach 1:
The patent extracts the IC from the FPC mounting configuration and places it directly on the substrate. This extraction eliminates the intermediate FPC layer and its associated wiring complexity, while the direct mounting on the substrate provides sufficient flexibility for the application. The IC is positioned to overlap the light emission region, achieving mounting flexibility without requiring the complex FPC wiring structure.
3Manufacturing precision
If the FPC mounting method is used, then the mounting width of the FPC increases, but the connection accuracy improves
Solution Approach 1:
The patent transitions from lateral connection accuracy in the planar dimension to vertical overlapping alignment in the thickness dimension. By allowing the IC to overlap the light emission region vertically, the connection accuracy is achieved through precise vertical positioning rather than requiring a wide FPC mounting area, thus reducing the mounting width while maintaining connection precision.
4Area of stationary object
If gaps between FPC wiring lines are narrowed, then the manufacturing accuracy requirement increases, but the substrate area reduces
Solution Approach 1:
The patent extracts the wiring structure from the FPC and integrates it directly into the substrate. By eliminating the FPC wiring lines and their associated gap requirements, the manufacturing accuracy burden on wiring line gaps is removed. The IC is mounted directly on the substrate with overlapping arrangement, avoiding the need for narrow FPC wiring gaps while achieving compact substrate area.
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 the substrate area, lowers manufacturing costs, prevents short circuits, and ensures uniform driving characteristics for the light-emitting elements, resulting in improved yield and reduced driving load.
Implementation Method 1
it is preferable that an anisotropic conductive film be used to fix the integrated circuit chip to the substrate
Data Source
AI summary
A light-emitting device includes a substrate having a plurality of light-emitting elements and a light emission region arranged on one surface thereof, light being emitted from one surface of the light emission region; and an integrated circuit chip that generates signals for controlling the plurality of light-emitting elements. The integrated circuit chip is connected to the substrate so as to overlap a portion of or the entire light emission region, as viewed from the other surface of the substrate.