Display Power Line Layout With Fan-Out Branching for Reliability
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Solution Overview
Problem
Existing display devices face challenges in achieving improved reliability, particularly in the design and layout of power lines and driving voltage lines, which can affect the overall performance and durability of the display.
Innovation Solution
The proposed display device incorporates a substrate with a display area and a non-display area, featuring pixels in the display area, and utilizes a specific layout of power lines and driving voltage lines, including fan-out lines and sub-power lines, to enhance reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single power line is used to supply voltage to pixels, then the structure is simple, but the reliability is reduced due to potential voltage drops and connection failures
Solution Approach 1:
The power line is divided into multiple sub-power lines (first sub-power line and second sub-power line) that branch off from separate fan-out lines. Each sub-power line independently supplies voltage to the pixel, ensuring that if one line fails, the pixel can still receive power through the other line, thereby improving reliability without requiring a completely redundant system
Solution Approach 2:
The patent transitions from a single-dimension power supply approach to a multi-dimensional approach by routing power through multiple fan-out lines (first and second fan-out lines) that are spaced apart. This spatial distribution across different dimensions reduces the risk of simultaneous failures and improves overall system reliability
2Reliability
If power lines are routed through the display area, then connection to pixels is direct, but the display quality is degraded due to line visibility and interference
Solution Approach 1:
The patent extracts the power line routing from the display area and relocates it to the non-display area. The first and second fan-out lines are disposed in the non-display area, where they can be routed without interfering with the display quality. This separation allows the power delivery function to be performed independently without compromising the visual output
Solution Approach 2:
The fan-out lines act as intermediary elements that bridge the driving voltage lines in the non-display area and the sub-power lines that reach the pixels. This intermediary structure allows power to be distributed reliably while keeping the critical display area free from interfering conductive elements
Data Source
AI summary
A display device may include a substrate including a display area and a non-display area; pixels disposed in the display area; first and second driving voltage lines disposed in the non-display area and spaced apart from each other; a first fan-out line disposed in the non-display area and electrically connected to the first driving voltage line; a second fan-out line disposed in the non-display area and electrically connected to the second driving voltage line; a first power line including at least two first sub-power lines branching off to a corresponding one of the pixels from the first fan-out line; and a second power line including at least two second sub-power lines branching off to a corresponding one of the pixels from the second fan-out line.