Linear Terminal Drive Device for Compact LED Array Substrates
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Solution Overview
Problem
Conventional electrophotographic image forming apparatuses face challenges in downsizing, particularly in the direction perpendicular to the light-emitting element arrays and drive devices, due to limitations in reducing the size and number of electrode pads for connecting light-emitting elements and drive circuits.
Innovation Solution
A drive device with input and output terminals arranged in a line, allowing for time-divisional driving of light-emitting elements, which shortens the substrate length and enables downsizing of the drive device and LED array in the direction perpendicular to the light-emitting element arrays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If electrode pads are arranged in conventional configurations for connecting drive devices to light-emitting element arrays, then connection reliability is maintained, but the substrate length in the direction perpendicular to light-emitting element arrays cannot be reduced
Solution Approach 1:
The patent repositions the electrode pads from conventional distributed arrangements to a linear configuration along one edge of the substrate. This dimensional reorganization allows the substrate length in the direction perpendicular to light-emitting element arrays to be reduced while maintaining all necessary electrical connections through the linear pad arrangement.
Solution Approach 2:
The patent merges multiple electrode pad functions into a linear arrangement where input terminals and output terminals are positioned along one edge. This consolidation reduces the overall substrate footprint while maintaining connection reliability through optimized wire bonding paths from the linear pad sequence.
2Area of stationary object
If drive devices are arranged perpendicular to light-emitting element arrays to reduce overall size, then device compactness improves, but electrode pad pitch narrowing becomes insufficient
Solution Approach 1:
The patent transitions from two-dimensional electrode pad distribution to a one-dimensional linear arrangement along the substrate edge. This dimensional change enables further pitch narrowing in the direction perpendicular to light-emitting element arrays while maintaining manufacturing feasibility through systematic wire bonding from the linear pad sequence.
Data Source
AI summary
A drive device for outputting a drive signal for driving a plurality of light emitting elements time-divisionally, the drive device includes a plurality of input terminals receiving input of a drive control signal for the light emitting elements, and a plurality of output terminals connected to the light emitting elements, for outputting the drive signal based on the drive control signal input into the input terminals, in which the input terminals and the output terminals are arranged substantially in a line.