Variable-Frame-Rate Display Driving for Motion Blur and Luminance Control
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Solution Overview
Problem
Conventional variable-framerate display devices experience varying motion blur durations due to differences in emission periods, leading to reduced image quality and user dizziness in AR or VR environments.
Innovation Solution
A display device with a driving controller that adjusts the current duty ratio and luminance of pixels based on frame rate comparisons, using a duty control unit and luminance control unit to maintain consistent motion blur and luminance levels across varying frame rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the frame rate is reduced in variable frequency mode, then power consumption is reduced, but motion blur duration varies leading to degraded image quality
Solution Approach 1:
The patent applies dynamics by making the emission period variable rather than fixed. The emission period is dynamically adjusted based on the frame rate to maintain a substantially constant duration, ensuring consistent motion blur characteristics across different frame rates while enabling power consumption reduction at lower frame rates
Solution Approach 2:
The patent changes the emission period parameter adaptively based on frame rate conditions. When operating at a frame rate lower than a reference frame rate, the emission period is extended to compensate for the reduced temporal sampling, thereby maintaining consistent motion blur duration and image quality across variable frequency operations
2Manufacturing precision
If the emission period is extended to maintain motion blur consistency, then image quality is improved, but luminance decreases due to longer off-periods
Solution Approach 1:
The patent applies parameter changes by adjusting the duty ratio of the emission period based on frame rate. When operating at lower frame rates with extended emission periods, the duty ratio is increased to ensure sufficient luminance output, thereby compensating for the longer off-periods and maintaining both image quality and brightness
Solution Approach 2:
The patent uses dynamic adjustment of the duty ratio in response to frame rate changes. The duty ratio is made variable to optimize the balance between emission duration and luminance output, ensuring that extended emission periods at lower frame rates do not result in unacceptable luminance reduction
Data Source
AI summary
A display device includes a display panel that emits light in response to a panel driving signal, a panel driver that provides the panel driving signal to the display panel, and a driving controller that receives an image signal at a current frame rate and controls driving of the panel driver based on the image signal and a control signal. The driving controller includes a comparing unit that compares a reference frame rate and the current frame rate and outputs a duty control signal when the current frame rate is less than the reference frame rate, a duty control unit that controls a current duty ratio of a current emission period of the display panel based on the duty control signal, and a luminance control unit that controls luminance of each of the pixels based on the current duty ratio.