Display Frequency Controller Gradual Transition Mechanism
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Solution Overview
Problem
Display devices experience flickering due to changes in driving frequency, leading to luminance differences and visually recognizable issues.
Innovation Solution
A display device with a frequency controller that adjusts the output frequency based on input frequency variations using Equations 1 and 2, where K=FREQ-P_FREQ×SLOPE+OFFSET and FREQ′=FREQ×K+P_FREQ×(1−K), with SLOPE and OFFSET constants controlling the frequency change rate, to minimize flickering by gradually approaching the input frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the driving frequency is changed abruptly to adapt to different image data signals, then the adaptability is improved, but flickering occurs due to luminance differences
Solution Approach 1:
The patent applies dynamics by making the frequency adjustment process gradual rather than abrupt. The frequency controller dynamically adjusts the output frequency in incremental steps over multiple frames, allowing the display to adapt to different input frequencies while minimizing visible flickering. This is achieved by calculating a target frequency and then adjusting the actual frequency gradually toward the target frequency across multiple display frames.
Solution Approach 2:
The patent uses preliminary action by pre-calculating the target frequency based on input frequency information before actually changing the display frequency. The frequency controller determines the desired frequency in advance and then implements a controlled transition plan to reach that frequency gradually, preventing sudden changes that would cause flickering.
2Productivity
If the frequency changes rapidly to improve response time, then the productivity is improved, but display quality deteriorates due to flickering
Solution Approach 1:
The system dynamically balances frequency response speed with display quality by adjusting the frequency incrementally rather than making abrupt changes. The frequency controller calculates appropriate step sizes and timing to achieve frequency transitions that are both efficient and visually smooth, maintaining display quality while improving response capability.
Solution Approach 2:
The patent implements periodic action by adjusting the frequency in regular intervals across multiple display frames. Instead of making a single abrupt change, the frequency is adjusted periodically at each frame refresh, allowing the display to adapt to new frequencies in a controlled, rhythmic manner that prevents flickering while maintaining reasonable response time.
3Measurement precision
If the output frequency is set equal to the input frequency, then the frequency accuracy is improved, but flickering occurs during frequency transitions
Solution Approach 1:
The patent applies preliminary action by calculating the target frequency in advance based on input frequency information, then implementing a gradual transition plan to reach that frequency. This pre-planned approach allows the system to achieve accurate target frequencies while avoiding abrupt transitions that would cause flickering during the frequency change process.
Solution Approach 2:
The frequency controller acts as an intermediary between the input frequency signal and the actual display output. It mediates the frequency transition by introducing intermediate frequency steps, smoothing out the transition between different frequencies and preventing direct abrupt changes that would cause flickering while still achieving the desired target frequency accuracy.
Data Source
AI summary
A display device includes: a display panel; and a frequency controller which receives an image data signal and an input frequency information and outputs the image data signal and a timing control signal. The frequency controller includes: an image processor which receives the image data signal; a frame memory which stores the image data signal; an output frequency determining unit which receives the input frequency information and determines an output frequency based on a variation amount of the input frequency; and an image output unit which receives the image data signal from the image processor, receives an output frequency information from the output frequency determining unit, and outputs the image data signal and the timing control signal. When an input frequency varies, the output frequency determining unit determines the output frequency based on the following equations:K=FREQ-P_FREQM_FREQ×SLOPE+OFFSET,andFREQ′=FREQ×K+P_FREQ×(1-K).