Display Device Emission Cycle Control for Flashing Prevention
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Solution Overview
Problem
Display devices experience deteriorated image quality due to flashing caused by changes in emission cycles between adjacent frame periods, leading to momentary increases or decreases in image luminance.
Innovation Solution
A display device with a controller that determines an emission cycle and emission-off ratio for each frame period, including sub-frame periods, to maintain consistent emission-off ratios across frame periods while adjusting emission cycles, thereby preventing flashing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the emission cycle is changed between adjacent frame periods, then the luminance control is improved, but flashing occurs causing image quality deterioration
Solution Approach 1:
The patent applies preliminary action by setting the emission-off ratio of the current frame period based on the emission cycles of previous and next frame periods before displaying the image. The controller calculates and determines the appropriate emission-off ratio in advance to prevent flashing, ensuring that the luminance transition is smooth and image quality is maintained while still achieving luminance control through emission cycle changes.
2Adaptability or versatility
If the emission cycle is changed between adjacent frame periods, then the luminance control is improved, but flashing occurs causing image quality deterioration
Solution Approach 1:
The patent applies preliminary anti-action by proactively counteracting the harmful flashing effect before it occurs. The controller determines the emission-off ratio of the current frame period in advance, considering the emission cycles of adjacent frame periods, to pre-compensate for potential luminance fluctuations. This preliminary counter-measure eliminates flashing while preserving the adaptability of luminance control through emission cycle adjustments.
3Reliability
If the emission-off ratio is adjusted for each frame period, then flashing is prevented, but the control complexity increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the emission-off ratio parameter based on the emission cycles of frame periods. The controller modifies this single parameter to prevent flashing while maintaining relatively simple control logic. The emission-off ratio is calculated using the relationship between current, previous, and next frame period emission cycles, providing an effective yet manageable control mechanism that improves image quality without excessive complexity.
Data Source
AI summary
A display device includes a display panel including a pixel and an emission line connected to the pixel, an emission driver which provides an emission signal defining emission periods and non-emission periods to the emission line, and a controller which determines an emission cycle corresponding to a number of the discontinuous emission periods during a frame period and an emission-off ratio which is a ratio of a sum of the non-emission periods to the frame period. An nth frame period between an n−1th frame period and an n+1th frame period in which the emission cycles are different and the emission-off ratios are equal includes first to mth sub-frame periods in which the emission-off ratios are different.