Light-Emitting Conversion Circuits With Buffered Reference Voltages
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Solution Overview
Problem
Existing light emitting apparatuses face issues with settling time and noise interference in digital/analog conversion circuits, leading to inconsistent light emission and reduced image quality due to shared reference voltages and increased parasitic capacitance.
Innovation Solution
Implementing a configuration with multiple conversion circuits connected via buffer circuits, where each conversion circuit receives a reference voltage through a dedicated buffer circuit, reducing parasitic capacitance and crosstalk, and using resistor strings to stabilize voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple DA conversion circuits share a common reference voltage, then device complexity is reduced, but noise interference and settling time increase
Solution Approach 1:
The patent divides the common reference voltage supply into multiple independent buffer circuits, each dedicated to a specific DA conversion circuit. This segmentation isolates the reference voltage paths, preventing noise coupling between circuits while maintaining the shared reference voltage architecture.
Solution Approach 2:
Buffer circuits are introduced as intermediary components between the reference voltage source and each DA conversion circuit. These buffers act as mediators that provide electrical isolation, reducing the direct coupling of noise while ensuring stable voltage delivery to each converter.
2Device complexity
If multiple DA conversion circuits share a common reference voltage, then device complexity is reduced, but settling time increases
Solution Approach 1:
The patent segments the reference voltage distribution into separate buffered paths for each DA conversion circuit. This segmentation reduces the total parasitic capacitance seen by each circuit compared to a shared unbuffered connection, thereby reducing the time required for each circuit to settle to its target voltage.
Solution Approach 2:
Buffer circuits serve as intermediaries that provide low-impedance voltage sources to each DA conversion circuit. This reduces the RC time constant of the voltage settling process, enabling faster convergence to the reference voltage level while maintaining the shared reference architecture.
3Loss of time
If precharging is used to reduce potential difference, then settling time is reduced, but noise interference cannot be reduced
Solution Approach 1:
The buffer circuits act as intermediaries that simultaneously achieve fast settling and noise reduction. The buffered reference voltage provides a low-impedance source that enables rapid voltage establishment (reducing settling time) while electrically isolating the DA conversion circuits from each other (reducing noise interference).
Data Source
AI summary
The present invention provides a light emitting apparatus comprising: a plurality of light emitting devices; a plurality of conversion circuits provided in correspondence with the plurality of light emitting devices, respectively; and a voltage generator configured to generate a plurality of reference voltages, wherein each of the plurality of conversion circuits converts, using the plurality of reference voltages generated by the voltage generator, a digital signal supplied from an outside into an analog signal for driving one corresponding light emitting device of the plurality of light emitting devices, and at least one reference voltage of the plurality of reference voltages is supplied from the voltage generator to each of the plurality of conversion circuits via a buffer circuit.