SLED Chip Thyristor Threshold Voltage Control
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Solution Overview
Problem
Current image forming apparatuses using LED print heads face challenges in achieving precise control over light-emitting diodes (LEDs) for efficient image formation, particularly in maintaining optimal threshold voltages and light intensity, which affects the quality and consistency of printed images.
Innovation Solution
The use of light-emitting thyristors with specific terminal configurations and connecting resistors on a substrate, allowing for precise control of threshold voltages and light emission through a self-scanning light-emitting element array (SLED) chip design, where light-emitting thyristors, setting thyristors, and transmission thyristors are sequentially switched to manage light intensity and image formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional LED print heads are used, then the structure is simple and ease of manufacture is good, but control precision over threshold voltage and light intensity is insufficient
Solution Approach 1:
The light-emitting chip is segmented into multiple functional regions: light-emitting thyristors for light output, setting thyristors for threshold voltage control, and transmission thyristors for signal transmission. This segmentation allows independent optimization of each function, achieving precise control over light intensity and threshold voltage while maintaining a modular structure that is manageable in complexity
Solution Approach 2:
The patent implements dynamic control of threshold voltages through setting thyristors that can be switched between ON and OFF states. This dynamic adjustment capability allows the system to adapt threshold voltages in real-time based on imaging requirements, significantly improving control precision compared to static traditional LED designs
Solution Approach 3:
Setting thyristors act as intermediary elements between the control circuit and light-emitting thyristors. These intermediaries provide precise control over the threshold voltages of light-emitting elements without requiring direct complex circuitry at each LED, thus improving control precision while managing overall system complexity
2Manufacturing precision
If light intensity control is improved, then image quality is enhanced, but energy consumption increases
Solution Approach 1:
The patent employs periodic switching of thyristors in scanning sequences rather than continuous operation. Light-emitting thyristors are activated in sequential groups corresponding to different scanning lines, allowing the system to achieve high image quality through precise timing and periodic activation, thereby reducing overall energy consumption compared to continuous illumination
Solution Approach 2:
Different regions of the light-emitting chip are assigned different functions with optimized characteristics. Light-emitting thyristors are designed for high intensity output, while setting thyristors use lower power for control functions. This local optimization allows high image quality in the light-emitting regions without proportionally increasing energy consumption across the entire chip
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables improved control over light emission, enhancing image quality and consistency by adjusting threshold voltages and light intensity, thereby addressing the limitations of traditional LED print heads.
Implementation Method 1
plural light-emitting thyristors that are disposed on a substrate and each of which has a first anode terminal, a first cathode terminal, and a first gate terminal
Data Source
AI summary
A light-emitting chip includes plural light-emitting thyristors having a first anode terminal, a first cathode terminal, and a first gate terminal, plural setting thyristors having a second anode terminal, a second cathode terminal, and a second gate terminal and setting the absolute value of a threshold voltage of each light-emitting thyristor to be smaller than that in an OFF state, plural transmission thyristors having a third anode terminal, a third cathode terminal, and a third gate terminal and setting the absolute value of a threshold voltage of each setting thyristor to be smaller than that in an OFF state, plural first connecting resistors connecting the first gate terminals and the second gate terminals, plural second connecting resistors connecting the second gate terminals and the third gate terminals, and plural third connecting resistors connecting the first gate terminals to a power supply line supplied with a source potential.