Horizontal Sync Signal Circuit Using Adaptive Reference Voltage
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Solution Overview
Problem
Existing display technologies require larger chip area and higher power consumption to generate a stable horizontal synchronizing signal due to the variability of the luminance signal's maximum and minimum voltages, necessitating frequent adjustments of the reference voltage.
Innovation Solution
A circuit comprising a first comparator, a control circuit, two digital-to-analog converters, and a second comparator is used to compare the luminance signal with reference signals, updating the reference voltages to match the luminance signal's variations, thereby generating a horizontal synchronizing signal with reduced chip area and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an analog-to-digital converter is used to transfer the luminance signal into a digital signal and acquire maximum and minimum voltages to decide the reference voltage, then the horizontal synchronizing signal can be generated, but the chip area and power consumption increase
Solution Approach 1:
The patent extracts only the essential function needed for reference voltage generation by removing the analog-to-digital converter and using only the necessary digital-to-analog converter components. This extraction reduces chip area while maintaining the core functionality of adapting reference voltage to luminance signal variations.
Solution Approach 2:
The patent uses a simplified digital control approach that copies the essential voltage adjustment functionality without requiring the full analog-to-digital conversion infrastructure. The digital control circuit replicates the voltage adaptation function more efficiently.
2Reliability
If an analog-to-digital converter is used to transfer the luminance signal into a digital signal and acquire maximum and minimum voltages to decide the reference voltage, then the horizontal synchronizing signal can be generated, but the power consumption increases
Solution Approach 1:
The patent removes the power-intensive analog-to-digital converter from the system while extracting and retaining only the essential voltage adaptation functionality through a simplified digital control circuit and selective use of digital-to-analog converters, thereby reducing power consumption.
Solution Approach 2:
The patent implements a power-efficient copy of the voltage adaptation function using digital control logic that generates control signals for the digital-to-analog converters, avoiding the high power consumption of full analog-to-digital conversion while maintaining signal stability.
3Reliability
If the reference voltage is adjusted frequently to match the varied maximum and minimum voltages of the luminance signal, then the horizontal synchronizing signal remains stable, but the device complexity increases
Solution Approach 1:
The patent implements dynamic reference voltage adjustment through digital control circuits that automatically adapt the reference voltage to match luminance signal variations in real-time, maintaining signal stability while using a more manageable digital control architecture.
Solution Approach 2:
The patent employs feedback mechanisms where the digital control circuit continuously monitors the luminance signal characteristics and adjusts the reference voltage accordingly through control signals to the digital-to-analog converters, maintaining stability without complex manual adjustment mechanisms.
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 solution effectively generates a horizontal synchronizing signal with reduced chip area and power consumption by using digital-to-analog converters to adjust reference voltages, ensuring stability and efficiency in signal generation.
Implementation Method 1
the first comparator is utilized to compare the luminance signal of a Component Video Connector of the display and a first reference signal to generate a compared signal
Implementation Method 2
the first digital-to-analog converter is coupled to the control circuit and the first comparator and based on the first digital controlled signal to generate the first reference signal to the first comparator
Implementation Method 3
the second digital-to-analog converter is coupled to the control circuit and based on the second digital controlled signal which is generated by the control circuit to generate a second reference signal
Implementation Method 4
the second comparator is coupled to the second digital-to-analog converter and is used to compare the luminance signal and the second reference signal to generate the horizontal synchronizing signal
Data Source
AI summary
A circuit for generating a horizontal synchronizing signal of a display includes: a first comparator which is used to compare a luminance signal of a Component Video Connector of the display and a first reference signal to generate a compared signal; a control circuit which is used to generate a first digital controlled signal according to the compared signal; a first digital-to-analog converter which is used to generate the first reference signal according to the first digital controlled signal; a second digital-to-analog converter which is used to generate a second reference signal according to a second digital controlled signal generated by the control circuit, wherein the second digital controlled signal is determined by the first digital controlled signal; and a second comparator which is used to compare the luminance signal and the second reference signal to generate the horizontal synchronizing signal.