Display Emission Period Adjustment for Variable Frame Flicker
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Solution Overview
Problem
Display devices operating in variable frame modes experience luminance deviations and flicker phenomena when frame frequencies change, affecting display quality.
Innovation Solution
A display device with a signal controller that adjusts the emission period of pixels based on the length of blank periods, using a counter and emission period adjuster to generate control signals for the emission driver, ensuring consistent luminance by modifying the pulse width of the emission control signal in response to changes in blank periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the frame frequency is changed to match the host processor rendering rate, then tearing phenomenon is prevented, but luminance deviation and flicker occur between frames
Solution Approach 1:
The patent applies dynamics by making the emission period adjustable and variable rather than fixed. The emission period is dynamically modified based on the blank period length of each frame, allowing the display device to adapt to different frame frequencies while maintaining consistent luminance. This is achieved through the emission period adjuster that modifies the emission control signal timing according to detected blank period variations.
Solution Approach 2:
The patent changes the emission period parameter in response to blank period variations. When the blank period changes due to variable frame frequency, the emission period is correspondingly adjusted to compensate, thereby maintaining constant luminance output. This parameter adjustment is implemented through modifying the pulse width or timing of the emission control signal applied to the pixels.
2Device complexity
If the emission period is kept constant, then the pixel control is simple, but luminance deviation occurs when blank period changes
Solution Approach 1:
The patent implements feedback by detecting the blank period length and using this information to adjust the emission period. The signal controller monitors the data enable signal to determine blank period duration, then feeds this information back to the emission period adjuster, which modifies the emission control signal accordingly. This closed-loop feedback mechanism ensures luminance consistency without requiring complex manual calibration.
Solution Approach 2:
The display device performs self-adjustment of the emission period based on its own detected blank period variations. The signal controller and emission period adjuster work autonomously to compensate for frame frequency changes without requiring external intervention or complex additional hardware, making the system self-regulating for luminance consistency.
3Illumination intensity
If the emission control signal pulse width is adjusted based on blank period changes, then luminance consistency is maintained, but the control system becomes more complex
Solution Approach 1:
The signal controller is designed to perform multiple functions: it detects the blank period length, determines the required emission period adjustment, and generates the modified emission control signal. By integrating these functions into a single controller unit, the patent avoids the need for separate dedicated circuits for each function, thereby reducing overall system complexity while maintaining luminance consistency through dynamic emission period adjustment.
Data Source
AI summary
A display device includes a display unit which includes pixels, an emission driver which applies an emission control signal for allowing the pixels to emit light, and a signal controller which receives a data enable signal including an active period and a blank period during which an image signal is inputted and outputs a control signal for controlling the emission driver such that an emission period of the pixels is changed in response to a blank period.