Integrated Driving Apparatus for LED Array Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing driving circuits for light-emitting element arrays are large in scale, leading to increased chip size and light emission unevenness due to variations in forward voltage drop and internal resistance among LEDs, which affects print quality in printing apparatuses.
Innovation Solution
A driving apparatus with multiple driving circuits integrated on a single semiconductor chip, each driving circuit comprising output terminals connected to multiple load elements, allowing for precise control of current and pulse signal height and width to correct light emission variations across light-emitting element arrays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a driving circuit is designed to control each LED individually with constant current driving, then light emission control precision is improved, but circuit scale increases leading to larger chip size
Solution Approach 1:
The patent merges multiple driving circuits onto a single semiconductor chip, integrating the functions of multiple LED drivers in one consolidated unit. This reduces the overall chip size compared to using separate chips for each driving circuit, while maintaining the ability to control light emission precision for each LED through individual constant current driving capability.
Solution Approach 2:
The driving circuit is designed with multi-functionality to handle multiple LEDs simultaneously, where a single integrated driving circuit can control multiple light-emitting elements through shared control mechanisms while maintaining individual current control capability. This universal design reduces the number of separate circuits needed.
2Stability of the object's composition
If forward voltage drop and internal resistance variations among LEDs are compensated for individual control, then light emission uniformity is improved, but circuit complexity increases
Solution Approach 1:
The patent applies local quality by providing individual constant current control for each LED or LED group, allowing specific compensation for forward voltage drop and internal resistance variations in each local region. This ensures light emission uniformity across different LEDs with varying electrical characteristics while managing circuit complexity through localized rather than global control adjustments.
Data Source
AI summary
A driving apparatus is provided. The driving apparatus comprises a plurality of driving circuits configured to generate a current according to an inputted voltage. The plurality of driving circuits are formed on a single semiconductor chip, and each of the plurality of driving circuits comprises a plurality of output circuits configured to supply the current to a plurality of load elements arranged in at least one load element array.