Display Drive Controller Frequency Compensation
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Solution Overview
Problem
Existing multimedia electronic devices face challenges in reducing power consumption while maintaining display quality, particularly when operating frequency is lowered, as this often results in deteriorated display performance.
Innovation Solution
A drive controller that calculates a representative frequency based on previous frame operating frequencies and generates a compensating signal to adjust the voltage provided to pixels, ensuring consistent display quality and reduced power consumption by optimizing the driving circuit's operation across varying frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the operating frequency is lowered to reduce power consumption, then power consumption is reduced, but display quality deteriorates
Solution Approach 1:
The patent changes the voltage parameter dynamically based on operating frequency. When the operating frequency is lowered, the drive controller adjusts the voltage to the pixels to compensate for the reduced frequency, thereby maintaining display quality while achieving power consumption reduction. This is implemented through the drive controller calculating a representative frequency and generating a compensating signal to adjust the voltage generator's output.
Solution Approach 2:
The patent implements a feedback mechanism where the drive controller continuously monitors the operating frequency and adjusts the voltage accordingly. The drive controller calculates a representative frequency based on previous frame frequencies and generates a compensating signal that feeds back to the voltage generator, creating a closed-loop control system that maintains display quality across varying frequencies.
2Use of energy by moving object
If the operating frequency is lowered to reduce power consumption, then power consumption is reduced, but brightness uniformity deteriorates
Solution Approach 1:
The patent dynamically adjusts the voltage parameter to compensate for frequency changes that affect brightness uniformity. By calculating the representative frequency and generating appropriate compensating signals, the system modifies the voltage to pixels to maintain consistent brightness across the display, even when operating at reduced frequencies for lower power consumption.
3Use of energy by moving object
If the operating frequency is lowered to reduce power consumption, then power consumption is reduced, but flickering increases
Solution Approach 1:
The patent employs feedback control where the drive controller monitors the operating frequency and continuously adjusts the voltage in response. This closed-loop system detects frequency variations and compensates for them by modifying the voltage to the pixels, thereby suppressing flickering and maintaining display stability even when operating at reduced frequencies.
Solution Approach 2:
The patent applies preliminary compensation by calculating the representative frequency in advance and generating compensating signals before the actual display refresh. This proactive adjustment of voltage based on predicted frequency variations prevents flickering from occurring in the first place, rather than merely reacting to it.
Data Source
AI summary
An electronic device includes a display panel which includes a plurality of pixels and displays an image at each of multiple frames, a driving circuit which drives the multiple frames at multiple operating frequencies, a voltage generator which provides a voltage to the display panel, and a drive controller. The drive controller includes a representative frequency calculator which calculates a representative frequency, based on operating frequencies of ‘n’ number of frames before one frame of the multiple frames, and a compensating signal calculator which outputs a compensating signal, based on the representative frequency and a count number in the one frame. The drive controller transmits the compensating signal to the voltage generator, the voltage includes a reference voltage, the voltage generator generates the reference voltage based on the compensating signal, and the voltage generator provides the reference voltage to each of the plurality of pixels.