Display Drive Controller for Variable-Frequency Luminance Stability
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Solution Overview
Problem
Existing display devices face challenges in maintaining display quality while reducing power consumption, particularly in environments where still images are displayed, as conventional methods do not effectively account for varying driving frequencies and their impact on luminance and power usage.
Innovation Solution
A display device with a drive controller that includes a representative frequency calculator, compensation signal calculator, and data compensation unit, which adjusts driving frequencies and luminance by using lookup tables to compensate for previous frame frequencies, thereby controlling voltage levels and pulse widths to improve display quality and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the driving frequency is decreased to reduce power consumption, then power consumption is reduced, but display quality deteriorates due to luminance deviation and flickering
Solution Approach 1:
The patent applies preliminary action by calculating a representative frequency based on previous frame frequencies before driving the current frame, and by pre-calculating compensation values stored in lookup tables. This allows the system to proactively compensate for luminance deviation and flickering that would occur during frequency transitions, thereby maintaining display quality while enabling power consumption reduction through lower driving frequencies.
Solution Approach 2:
The patent changes the parameter of driving frequency dynamically based on display content requirements. By transitioning from fixed high-frequency driving to variable frequency driving (adjusting between 60Hz, 30Hz, 15Hz, etc.), the system can reduce power consumption during still image display while maintaining high quality during video playback. The representative frequency calculation and compensation mechanisms ensure quality is maintained during these parameter transitions.
2Use of energy by moving object
If variable driving frequencies are used to reduce power consumption, then power consumption is reduced, but luminance deviation and flickering occur
Solution Approach 1:
The patent implements feedback by continuously monitoring the actual driving frequency and using it to calculate the representative frequency for the next frame. The compensation value is determined based on this feedback loop, adjusting the data signal or emission signal to counteract luminance deviation. This closed-loop control ensures luminance stability even when driving frequencies vary to reduce power consumption.
Solution Approach 2:
The system performs preliminary calculation of the representative frequency and retrieves pre-computed compensation values from lookup tables before driving each frame. This advance preparation allows the system to compensate for luminance instability caused by frequency transitions, maintaining stable display output while utilizing variable frequencies for power savings.
3Reliability
If compensation mechanisms are added to maintain display quality, then display quality is improved, but device complexity increases
Solution Approach 1:
The patent reduces complexity by pre-calculating compensation values for various frequency transitions and storing them in lookup tables during manufacturing or initialization. During operation, the controller only needs to calculate the representative frequency and retrieve the appropriate compensation value, avoiding complex real-time calculations and simplifying the controller architecture while maintaining display quality.
Solution Approach 2:
The patent uses lookup tables that store pre-computed compensation data, effectively copying previously calculated optimal compensation values into a readily accessible format. This allows the controller to use simple table lookup instead of complex algorithms, reducing computational complexity while maintaining the ability to compensate for luminance deviation and flickering.
Data Source
AI summary
A display device includes a display panel that includes a plurality of pixels and displays an image corresponding to each of a plurality of frames, and a drive controller that receives an image signal and drives the plurality of frames at a plurality of driving frequencies. The drive controller includes a representative frequency calculator, a compensation signal calculator, and a data compensation unit that receives an image signal and outputs a compensation data signal by adding a gray of the image signal and a gray value based on a data correction lookup table in which the gray value is stored. Luminance of the image is controlled based on the compensation signal and the compensation data signal.