Display Driver DAC Architecture for Compact Accurate Output
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Solution Overview
Problem
Conventional digital-to-analog converters in display driving apparatuses face challenges in minimizing area while ensuring accuracy and uniformity of output, often compromising on either circuit area or signal quality due to offset errors and increased power consumption.
Innovation Solution
A driving apparatus comprising a reference voltage generator that produces both reference and sub-reference voltages, with a digital-to-analog converter using selection switches to process high and low bit data signals, and an output unit that adds or subtracts these signals using MOS transistors, reducing the number of switches and capacitors to minimize area while maintaining signal accuracy and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional digital-to-analog converters are used with multiple switches and capacitors to ensure signal accuracy, then the output accuracy and uniformity are maintained, but the circuit area increases and power consumption increases
Solution Approach 1:
The patent divides the digital-to-analog converter into two separate converters: a first DAC for processing high-order bits and a second DAC for processing low-order bits. This segmentation allows each converter to use fewer switches and capacitors, reducing the total circuit area while maintaining overall conversion accuracy through the combination of both converters.
Solution Approach 2:
The patent introduces a subtraction circuit as an intermediary element that subtracts the output signal of the first DAC from the output signal of the second DAC. This intermediary processing step enables the system to achieve accurate analog output using fewer components than a conventional single DAC would require.
2Measurement precision
If conventional digital-to-analog converters are used with multiple switches and capacitors to ensure signal accuracy, then the output accuracy and uniformity are maintained, but the power consumption increases
Solution Approach 1:
The patent divides the digital-to-analog converter into two separate converters: a first DAC for processing high-order bits and a second DAC for processing low-order bits. This segmentation allows each converter to use fewer switches and capacitors, reducing the total circuit area while maintaining overall conversion accuracy through the combination of both converters.
Solution Approach 2:
The patent introduces a subtraction circuit as an intermediary element that subtracts the output signal of the first DAC from the output signal of the second DAC. This intermediary processing step enables the system to achieve accurate analog output using fewer components than a conventional single DAC would require.
3Area of stationary object
If the number of switches and capacitors is reduced to minimize area, then the circuit area is reduced, but offset errors increase and signal accuracy deteriorates
Solution Approach 1:
The patent introduces a subtraction circuit as an intermediary element that subtracts the output signal of the first DAC from the output signal of the second DAC. This intermediary processing step enables the system to achieve accurate analog output using fewer components than a conventional single DAC would require.
Solution Approach 2:
The patent changes the operating parameters by using different reference voltages for the first and second DACs, and by processing different bit ranges (high-order vs. low-order bits) in each converter. This parameter differentiation allows the system to maintain accuracy despite using fewer components in each individual converter.
4Device complexity
If conventional single-stage DAC architecture is used, then the circuit construction is simple, but the area cannot be minimized while maintaining accuracy
Solution Approach 1:
The patent divides the digital-to-analog converter into two separate converters: a first DAC for processing high-order bits and a second DAC for processing low-order bits. This segmentation allows each converter to use fewer switches and capacitors, reducing the total circuit area while maintaining overall conversion accuracy through the combination of both converters.
Solution Approach 2:
The patent introduces a subtraction circuit as an intermediary element that subtracts the output signal of the first DAC from the output signal of the second DAC. This intermediary processing step enables the system to achieve accurate analog output using fewer components than a conventional single DAC would require.
Data Source
AI summary
A driving apparatus for a display is provided. The driving apparatus for a display comprises a reference voltage generator, a digital-to-analog converter, and an output unit. The reference voltage generator generates a plurality of reference voltages, and receives a difference value between two adjacent reference voltages and generates a plurality of sub reference voltages. The digital-to-analog converter selects one of the reference voltages and outputs the selected reference voltage as a first analog signal. The digital-to-analog converter selects one of the sub reference voltages and outputs the selected reference voltage as a second analog signal. The output unit processes, by addition or subtraction, the first and second analog signals for output.