Frequency-Variable Display Control with Extended Blank Periods
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Solution Overview
Problem
Frequency variable display apparatuses face challenges in implementing real-time operations due to insufficient vertical blank periods, leading to momentary afterimages when transitioning from still images on screens.
Innovation Solution
A frequency variable display apparatus and method that analyzes image data to distinguish between still and moving images, fixing the variable frame frequency to a reference frame frequency during still image display and performing real-time sensing and compensation operations in a fixed vertical blank period, ensuring the blank period is sufficient for accurate pixel compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If variable refresh rate operation is implemented to achieve high driving speed, then productivity is improved, but the vertical blank period becomes insufficient leading to inability to perform real-time operation
Solution Approach 1:
The patent applies dynamics by making the frame frequency variable rather than fixed. The display apparatus dynamically adjusts the frame frequency based on the type of image content (still image vs. moving image). For still images, it uses a lower reference frame frequency that provides sufficient vertical blank period for real-time sensing and compensation operations, while for moving images it can use higher frequencies. This dynamic adaptation resolves the contradiction between maintaining high driving speed and ensuring sufficient blank period for compensation.
2Manufacturing precision
If real-time sensing and compensation operation is performed to prevent afterimages, then manufacturing precision is improved, but the vertical blank period required increases
Solution Approach 1:
The patent applies parameter changes by adjusting the frame frequency parameter based on image content analysis. When still images are detected, the system changes to a lower reference frame frequency, which naturally extends the vertical blank period to accommodate real-time sensing and compensation operations. This parameter adjustment ensures that the blank period is always sufficient for accurate compensation without requiring additional time resources, thereby resolving the contradiction between compensation accuracy and blank period duration.
3Productivity
If variable frame frequency is used to optimize performance, then productivity is improved, but reliability deteriorates due to momentary afterimages
Solution Approach 1:
The patent applies feedback through image content analysis that monitors the type of image being displayed (still or moving). Based on this feedback, the system automatically adjusts the frame frequency to appropriate levels. For still images, it feedbacks to use lower reference frame frequency to prevent afterimages, while for moving images it can maintain higher frequencies. This closed-loop feedback mechanism ensures display quality is maintained while optimizing performance, resolving the contradiction between productivity and reliability.
Data Source
AI summary
A frequency variable display apparatus includes a display panel where a plurality of pixels are provided, an image analyzer configured to analyze image data, which is to be written in the plurality of pixels, to determine whether a frame image implemented in the display panel is a still image or a moving image, and a first controller configured to fix a variable frame frequency, varying within a certain frequency range, to one reference frame frequency of the certain frequency range and implement a real-time sensing & compensation operation in a vertical blank period of a fixed frame time, while the still image is being implemented in the display panel, wherein a length of the vertical blank period of the fixed frame time is longer than or equal to a minimum desired time needed for the real-time sensing and compensation operation.