Semiconductor Device Low Power Digital Analog Conversion
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Solution Overview
Problem
Existing digital-to-analog (DA) converters in display devices face challenges in reducing power consumption due to the continuous flow of total current through resistance, making it difficult to achieve low power consumption and high reliability.
Innovation Solution
A semiconductor device comprising multiple current sources and switches, including oxide semiconductor transistors, which allows for the conversion of digital signals into voltage signals with reduced power consumption by selectively controlling current flow through capacitors and switches, enabling efficient DA conversion without continuous current supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If total current flows continuously through resistance to generate output voltage, then the DA converter can maintain stable voltage output, but power consumption increases
Solution Approach 1:
The patent implements periodic action by controlling current flow through switches that operate in discrete time intervals. The DA converter uses clock signals to periodically switch current sources on and off, charging capacitors during active periods and maintaining voltage during idle periods. This periodic operation allows the system to achieve stable output voltage while consuming power only during necessary conversion intervals, not continuously.
Solution Approach 2:
The patent applies preliminary action by pre-charging capacitors during specific time intervals before the actual output is needed. The circuit structure includes capacitors that are charged in advance during the conversion phase, then maintain the voltage output during the display phase without requiring continuous current flow. This preliminary charging action enables the system to prepare voltage levels beforehand, eliminating the need for continuous power consumption.
2Stability of the object's composition
If continuous current supply is used to maintain signal potential, then the DA converter can ensure signal stability, but power usage increases
Solution Approach 1:
The patent introduces capacitors as intermediary energy storage elements between the current sources and the output. These capacitors act as mediators that store electrical energy during active conversion periods and release it during idle periods, maintaining signal potential stability without requiring continuous current flow from the power supply. The capacitors buffer the energy transfer, decoupling the continuous voltage requirement from continuous power consumption.
Solution Approach 2:
The patent implements dynamic operation by switching between different current sources and capacitor configurations based on the digital input signal and clock phase. The circuit transitions between charging states, holding states, and discharge states dynamically, allowing the system to adapt its power consumption to the actual conversion needs while maintaining stable output during display periods through capacitor discharge.
Data Source
AI summary
A semiconductor device with low power consumption is provided. The semiconductor device can serve as a current output DA converter. The semiconductor device converts a current corresponding to a digital signal into a voltage and then holds the voltage, which allows output of the analog voltage even after stopping supply of the current. A plurality of circuits that converts a current into a voltage is provided, whereby a settling time for changing the analog output voltage is reduced.