Electro-optical Driving Circuit Reference Current Stabilization
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Solution Overview
Problem
Existing electro-optical device configurations face challenges in maintaining consistent reference current across semiconductor chips due to manufacturing variations and noise interference, leading to deviations in gray scale control of electro-optical elements like OLEDs.
Innovation Solution
A driving circuit configuration with multiple terminal groups and current generators is arranged in a manner that allows for bidirectional adjustment of reference currents between adjacent circuits, using current mirror circuits and reference potential lines to balance and equalize reference currents, thereby reducing deviations and enhancing layout flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single reference current generating circuit supplies reference current to multiple semiconductor chips through elongated wires, then all chips can share a common reference current, but the reference current becomes easily varied due to noise from peripheral circuits
Solution Approach 1:
The patent divides the reference current generation function into multiple independent reference current generating circuits, each located on individual semiconductor chips. This segmentation eliminates the need for elongated inter-chip wires and isolates each chip's reference current from external noise, while still achieving coordinated operation across all chips through the data signal generation process.
2Adaptability or versatility
If reference current is supplied sequentially to multiple semiconductor chips, then each chip generates its own reference current, but the reference current deviates accumulatively due to manufacturing variations and noise superposition
Solution Approach 1:
The patent employs feedback mechanisms where data signal generators on each semiconductor chip use the reference current from their own chip to generate data signals. This creates a feedback loop that compensates for manufacturing variations and prevents cumulative deviation, as each chip's reference current is used locally to generate its data signals rather than being propagated sequentially through multiple chips.
3Measurement precision
If multiple terminal groups and current generators are arranged for bidirectional adjustment of reference currents, then reference current consistency between adjacent circuits is improved, but circuit complexity increases
Solution Approach 1:
The patent combines multiple terminal groups and current generators into an integrated driving circuit structure where adjacent circuits share common reference current paths. This merging approach allows bidirectional adjustment of reference currents while reducing overall complexity compared to fully independent circuits, as the shared structure enables mutual calibration between adjacent chips without requiring completely separate control mechanisms for each chip.
Data Source
AI summary
A driving circuit of an electro-optical device having electro-optical elements which are changed to optical states corresponding to data signals includes: a first terminal group and a second terminal group of which each includes an input terminal and an output terminal; a first current generator for generating first reference current corresponding to an input signal to the input terminal of the first terminal group; a second current generator for generating second reference current corresponding to an input signal to the input terminal of the second terminal group; a data signal generator for generating the data signals corresponding to the first reference current and the second reference current; a first output unit for outputting the data signal corresponding to the second reference current to the output terminal of the first terminal group; and a second output unit for outputting the data signal corresponding to the first reference current to the output terminal of the second terminal group.