Display Device Image Data Processor Variable Frame Flicker Correction
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Solution Overview
Problem
Display devices operating in variable frame mode experience flicker due to luminance differences when driven at different frame frequencies, as existing technologies fail to effectively correct luminance and color coordinates for variable input frame frequencies.
Innovation Solution
A display device with an image data processor that determines correction values to minimize luminance and color differences by using lookup tables and color space conversions, ensuring consistent output image data across varying frame frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display device operates in variable frame mode to prevent tearing phenomenon, then the tearing phenomenon is prevented, but luminance differences occur when driven at different frame frequencies causing flicker
Solution Approach 1:
The patent applies parameter changes by adjusting the luminance of image data based on the input frame frequency. The controller determines a luminance correction value corresponding to the current frame frequency and multiplies it with the image data to compensate for luminance differences. This dynamic parameter adjustment ensures consistent perceived luminance across variable frame rates, resolving the flicker issue while maintaining variable frame mode operation.
2Reliability
If frame frequency is varied to match host processor output, then tearing is prevented, but color coordinates become inconsistent across different frame frequencies
Solution Approach 1:
The patent extends parameter changes to include color coordinate correction. The controller determines color coordinate correction values based on the input frame frequency and applies them to the image data. This ensures that color coordinates remain consistent across different frame frequencies, preventing color shifts while maintaining the benefits of variable frame rate operation.
Solution Approach 2:
The patent implements a feedback mechanism where the controller continuously monitors the input frame frequency and dynamically adjusts both luminance and color coordinate correction values accordingly. This closed-loop approach ensures that display parameters are continuously optimized to maintain consistency across varying frame rates, resolving both luminance and color coordinate issues.
Data Source
AI summary
Provided is a display device comprising a display panel including a plurality of pixels respectively connected to a plurality of scan lines and a plurality of data lines, a scan driver configured to scan signals to the pixels through the scan lines, a date driver configured to provide data voltages to the pixels through the data lines, and a controller configured to control the scan driver and the date driver, and including an image data processor configured to receive input image data at variable input frame frequency. Accordingly, display quality is improved because a flicker is minimized or reduced.