OLED Display Line Arrangement for Repair Success
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Solution Overview
Problem
In high-resolution organic light emitting diode (OLED) displays, the narrow distance between signal lines increases the probability of repair failure during short circuit disconnection, as adjacent signal lines may be damaged, leading to particle generation and reduced repair success rates.
Innovation Solution
The OLED display is designed with alternately arranged data lines and driving voltage lines, forming a mesh-type structure that allows for the application of driving voltage to each pixel through other portions, even in case of a short circuit, minimizing damage to adjacent data lines during repair by using a digital driving method and separate data drivers at upper and lower sides of the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If signal lines are placed closer together to achieve higher resolution, then display resolution is improved, but the probability of short circuit and repair failure increases
Solution Approach 1:
A repair line is introduced as an intermediary conductive path that connects the pixel circuit unit to the data line when a short circuit occurs. This repair line acts as a mediator to bypass the damaged direct connection, allowing the pixel to continue functioning through the alternative path provided by the repair line.
Solution Approach 2:
The repair line is pre-formed during the manufacturing process before any defects occur. By preparing the repair line in advance and positioning it between the pixel circuit unit and data line, the system is ready to handle short circuit defects without requiring additional repair steps, thus improving repair success rate while maintaining high resolution.
2Reliability
If laser irradiation is used to separate short-circuited signal lines, then short circuit is resolved, but adjacent signal lines may be damaged and particles generated
Solution Approach 1:
The repair line serves as a pre-established alternative connection that eliminates the need for laser irradiation to separate short-circuited lines. By providing this intermediary path, the harmful laser process is avoided entirely, preventing particle generation while still resolving the short circuit issue through the repair line connection.
Solution Approach 2:
Instead of using a potentially harmful laser process to resolve short circuits, the invention converts the manufacturing process to include a pre-formed repair line that provides a benign, particle-free solution. The potential harm of laser irradiation is replaced by a beneficial pre-planned repair path that achieves the same functional result without adverse effects.
3Reliability
If data lines and driving voltage lines are arranged alternately, then short circuit instances are reduced and repair space is increased, but device structure becomes more complex
Solution Approach 1:
The conductive line system is segmented into distinct functional groups: data lines for signal transmission and driving voltage lines for power supply. By separating these functions into alternate parallel lines, the design reduces the probability of short circuits between different functional lines while the repair line provides an additional segmented path for defect recovery.
Solution Approach 2:
The repair line is designed with multi-functionality, serving both as a normal conductive path during operation and as a dedicated repair path when defects occur. This universal line structure allows the system to maintain simplicity while providing enhanced reliability, as the same physical infrastructure serves multiple purposes without requiring separate complex repair mechanisms.
Data Source
AI summary
An organic light emitting diode display includes: a substrate comprising a red pixel, a green pixel, and a blue pixel arranged in a matrix; a scan line on the substrate and extending in a row direction; a red data line, a green data line, and a blue data line between adjacent pixel columns to cross the scan line; a driving voltage line alternating with the red data line, the green data line, and the blue data line; and a horizontal driving voltage line extending parallel with the scan line and electrically connected to the driving voltage line.