Offset Data Line Segmentation for Compact Exposure Heads
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Solution Overview
Problem
Existing driving circuits for light emitting elements face challenges in reducing the area occupied by data lines due to the difficulty in narrowing the interval between adjacent lines, especially when multiple lines with three or more land parts are arranged, which hinders the miniaturization and high-speed operation of exposure heads.
Innovation Solution
The driving circuit design includes data lines with base parts and line parts that are offset on both sides of the base parts, with alternating first and second base parts to counterbalance the shift of line parts, allowing for a reduction in the area occupied by the data lines by minimizing the shift amount and effectively shortening the distance between adjacent data lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data lines are made wider to cover contact holes, then connection reliability is improved, but the area occupied by data lines increases and line intervals cannot be reduced
Solution Approach 1:
The data line is segmented into base parts (covering contact holes) and line parts (connecting base parts), allowing each segment to be optimized independently for its specific function
Solution Approach 2:
The data line structure transitions from a single-dimensional wide coverage approach to a two-dimensional configuration with base parts and line parts at different positions, reducing the overall area while maintaining connection reliability
2Manufacturing precision
If data lines are arranged with larger intervals to accommodate contact hole coverage, then manufacturing precision is improved, but the overall area increases and productivity decreases
Solution Approach 1:
Dividing the data line into base parts and line parts allows contact holes to be covered precisely at base parts while line parts can be positioned with smaller intervals, maintaining manufacturing precision while reducing overall area
Solution Approach 2:
Different parts of the data line have different widths and functions: base parts are wider for reliable contact hole coverage, while line parts are narrower for compact arrangement, optimizing local properties for specific functions
3Area of stationary object
If the exposure head area is reduced by minimizing data line coverage, then cost is reduced, but connection reliability may deteriorate
Solution Approach 1:
The data line is divided into base parts that specifically cover contact holes with sufficient width for reliable connections, while line parts connect these base parts with reduced width, achieving compact area while maintaining connection reliability at critical points
Solution Approach 2:
The base parts are positioned in advance to cover contact holes before the line parts connect them, ensuring that connection reliability is established at the outset while allowing subsequent compact arrangement
Data Source
AI summary
Each data line includes base parts covering contact holes and line parts extending in an array direction of pixel circuits and connecting adjacent base parts to each other. The line parts have a smaller width in a direction perpendicular to the array direction than the base parts and are connected to the base parts while being offset in the direction perpendicular to the array direction from each other on both sides of at least two base parts that include first and second base parts. A connection position of the first base part with the line part on one side among both sides of the base units is located on the pixel circuit side with respect to the other side, and a connection position of the second base part on the one side is located on an opposite side to the pixel circuit side with respect to the other side.