Display Driver IC Signal Conversion Using Delta-Sigma Modulation
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Solution Overview
Problem
Current display driver integrated circuits (ICs) for mobile devices are not adequately miniaturized, leading to larger form factors in mobile devices such as smartphones and tablets, which hinders their portability and efficiency.
Innovation Solution
A display driver IC that incorporates a shift register for digital signal output, a delta-sigma modulator for signal modulation using a first voltage, and a level shifter for signal amplification using a second higher voltage, enabling the generation of data voltages for grayscale display in pixels, thereby reducing the size and power consumption of the IC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional display driver IC architecture is used, then grayscale display capability is maintained, but the size of the IC becomes large
Solution Approach 1:
The patent applies parameter changes by transitioning from conventional voltage-level signal processing to delta-sigma modulation with bit-serial data transmission. This fundamental parameter change in the signal processing domain enables significant area reduction while maintaining display functionality, as the modulated signal requires fewer processing stages and smaller circuit components.
Solution Approach 2:
The patent replaces traditional parallel voltage processing circuits with a sequential delta-sigma modulation system. This substitution of the signal processing mechanism - moving from direct voltage control to pulse-density modulation - eliminates the need for large parallel processing circuits, thereby reducing the overall IC size while preserving grayscale display capability.
2Volume of moving object
If the display driver IC is miniaturized, then portability is improved, but signal processing capability may be compromised
Solution Approach 1:
By changing the signal representation parameter from parallel voltage levels to sequential modulated bits, the patent achieves compact circuit implementation. The delta-sigma modulation encodes grayscale information in time-domain bit sequences, allowing simple digital logic circuits to replace complex analog voltage processing, thus maintaining signal processing reliability in a miniaturized form factor.
Solution Approach 2:
The patent introduces delta-sigma modulation as an intermediary process between the digital input and the display panel. This modulation stage converts parallel digital data into a serialized modulated signal that can be processed by compact circuits. The modulated signal acts as an intermediary carrier that preserves all grayscale information while enabling area-efficient processing and transmission.
Data Source
AI summary
A display driver integrated circuit (IC) is provided. The display driver IC includes a shift register configured to output a digital signal, and a digital-analog converter configured to receive the digital signal and generate a data voltage corresponding to the digital signal, wherein the digital-analog converter includes a delta-sigma modulator configured to output a modulated signal by receiving the digital signal and a first voltage, and performing delta-sigma modulation on the digital signal using the first voltage, and a level shifter configured to receive the modulated signal and a second voltage higher than the first voltage, and amplify the modulated signal using the second voltage.