Split-Bit DA Conversion Circuit With Coupling Capacitance Linearity
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Solution Overview
Problem
Existing DA conversion circuits for electro-optical devices, such as those using OLEDs, face accuracy and linearity issues when converting digital data into analog voltages, particularly with multi-bit input data, leading to deteriorated voltage conversion accuracy and worsened linearity.
Innovation Solution
A DA conversion circuit comprising a first DA conversion circuit unit for higher bits and a second DA conversion circuit unit for lower bits, with a coupling capacitance between them, where the switching elements supply specific potentials to the capacitance elements, ensuring distinct potentials for improved voltage conversion linearity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional DA conversion circuit with capacitance elements and switching elements is used, then the circuit can convert digital data to analog voltage, but the accuracy and linearity of voltage conversion deteriorates with multi-bit input data
Solution Approach 1:
The DA conversion circuit is divided into multiple independent conversion units (first DA conversion circuit unit and second DA conversion circuit unit), each handling specific bit ranges. This segmentation allows each unit to be optimized independently, improving overall conversion accuracy while managing circuit complexity through modular design.
Solution Approach 2:
The patent introduces a coupling capacitance that connects the first and second DA conversion circuit units, adding a new dimensional relationship between the units. This coupling mechanism enables interaction and coordination between the segmented units, improving linearity and accuracy without significantly increasing overall circuit complexity.
2Manufacturing precision
If switching elements supply potentials to capacitance elements in a conventional DA conversion circuit, then digital to analog conversion is achieved, but linearity worsens with multi-bit data
Solution Approach 1:
Different switching element units (higher switching element unit and lower switching element unit) are configured with different characteristics and supply different potentials (first potential, second potential, and third potential) to their respective capacitance elements. This local differentiation optimizes linearity for each bit range while managing overall switching complexity.
Solution Approach 2:
The patent employs multiple distinct potentials (first potential, second potential, and third potential where the third potential differs from the second) supplied by switching elements to capacitance elements. By changing the electrical parameters (potentials) in different circuit units, the linearity of voltage conversion is improved across multi-bit data ranges.
3Measurement precision
If capacitance elements are used for digital to analog conversion, then voltage conversion is achieved, but accuracy deteriorates with multi-bit input data
Solution Approach 1:
Capacitance elements are divided into higher capacitance element unit and lower capacitance element unit, each associated with specific bit ranges. This segmentation allows each capacitance unit to be optimized for its specific function, improving overall conversion accuracy while organizing the capacitance arrangement in a structured manner.
Solution Approach 2:
A coupling capacitance is introduced as an intermediary element between the first and second DA conversion circuit units. This coupling capacitance mediates the interaction between the higher and lower capacitance element units, enabling improved accuracy in multi-bit data conversion while maintaining an organized capacitance element arrangement.
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
The proposed solution enhances the linearity and accuracy of voltage conversion, effectively addressing the linearity issues in multi-bit data conversion, thereby improving the display quality of electro-optical devices.
Implementation Method 1
a coupling capacitance provided between the first DA conversion circuit unit and the second DA conversion circuit unit
Data Source
AI summary
A DA conversion circuit includes a first DA conversion circuit unit corresponding to a higher bit, a second DA conversion circuit unit corresponding to a lower bit, a capacitance element provided between the first DA conversion circuit unit and the second DA conversion circuit unit, the first DA conversion circuit unit includes a capacitance element and a selection circuit, the second DA conversion circuit unit includes a capacitance element and a selection circuit, and the selection circuit supplies a potential VL or VPH to one end of the capacitance element, and the selection circuit supplies the potential VL or VPL to one end of the capacitance element. The potential VPL is different from the potential VPH, and for example, VPL>VPH.