Display Driving Controller With Grayscale and Load-Based Voltage Control
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Solution Overview
Problem
Existing electronic devices face challenges in reducing power consumption and minimizing display quality degradation while adjusting luminance based on input video signal load.
Innovation Solution
A driving controller that includes a voltage determination block, power luminance controller, overcurrent-reference-setting block, current-sensing-and-overcurrent-determining unit, and voltage controller to analyze grayscale, calculate load, and adjust driving voltage levels based on feedback current signals, using lookup tables to optimize power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the luminance of the display panel is reduced when the load of the input image signal is great, then power consumption is reduced, but display quality deteriorates
Solution Approach 1:
The patent applies dynamics by making the driving voltage adjustable rather than fixed. The voltage controller dynamically changes the driving voltage level based on the calculated load of the input image signal, allowing the system to adapt between power saving mode (lower voltage for high load) and quality mode (higher voltage for low load), thus resolving the contradiction between power consumption and display quality
Solution Approach 2:
The patent changes the voltage parameter based on the image signal load. By calculating the load and using lookup tables to determine appropriate voltage levels, the system adjusts the driving voltage parameter to match the actual display requirements, enabling optimal balance between power consumption and display quality for different operating conditions
2Reliability
If the driving voltage level is increased to maintain display quality, then display performance is improved, but power consumption increases
Solution Approach 1:
The system dynamically adjusts the driving voltage level based on real-time analysis of the input image signal load. When the load is low, the voltage is increased to maintain display quality; when the load is high, the voltage is reduced to save power. This dynamic adaptation resolves the contradiction by making the voltage level flexible rather than fixed
Solution Approach 2:
The patent performs preliminary calculation of the image signal load and uses lookup tables to pre-determine appropriate voltage levels before actual display occurs. This preliminary action allows the system to proactively adjust voltage to optimal levels, preventing unnecessary power consumption while ensuring display quality is maintained when needed
Data Source
AI summary
A driving controller includes a voltage determination block to analyze a grayscale of an input image signal, and to output a voltage signal according to the analyzed grayscale, a power luminance controller to calculate a load of the input image signal, an overcurrent-reference-setting block to output an overcurrent reference value based on the voltage signal and the load, a current-sensing-and-overcurrent-determining unit to receive a feedback current signal, to compare a current level of the feedback current signal with the overcurrent reference value, and to output a first signal, and a voltage controller to output a voltage control signal for setting a voltage level of a first driving voltage based on the voltage signal and the first signal, wherein the overcurrent-reference-setting block outputs the overcurrent reference value based on a current error corresponding to the voltage level indicated by the voltage signal, and a maximum current corresponding to the load.