Display Light Emission Cycle Control for Flicker-Free Luminance Shifts
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Solution Overview
Problem
Display devices experience flicker due to changes in the frequency of the light emission signal when adjusting luminance levels, which can be perceived by users.
Innovation Solution
A display device and driving method that control the light emission cycles to reduce flicker by transitioning through intermediate cycles when changing luminance levels, using a timing controller with a lookup table to determine appropriate light emission cycles based on luminance levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light emission signal frequency is changed to adjust luminance levels, then the luminance control is improved, but flicker occurs which deteriorates display quality
Solution Approach 1:
The patent applies dynamics by making the light emission cycle variable rather than fixed. The timing controller dynamically adjusts the light emission cycle based on the luminance level, using different cycles for different luminance ranges. This dynamic adaptation allows the system to maintain stable light emission characteristics across varying luminance levels, thereby reducing flicker while preserving luminance control capability.
Solution Approach 2:
The patent changes the parameter of light emission cycle duration based on luminance level. By establishing a correspondence between luminance levels and specific light emission cycles, the system modifies the temporal parameters of light emission to match the required luminance output. This parameter change approach enables smooth transitions between different luminance states without causing perceptible flicker.
2Adaptability or versatility
If the light emission cycle is adjusted to control luminance, then luminance adjustment capability is improved, but display stability deteriorates due to flicker perception
Solution Approach 1:
The system dynamically selects appropriate light emission cycles based on the target luminance level. The timing controller contains correspondence information that maps different luminance levels to specific light emission cycles, allowing the display to adapt its emission characteristics dynamically. This dynamic selection maintains display stability by ensuring that each luminance level uses an optimized cycle that minimizes flicker perception.
Solution Approach 2:
The timing controller acts as an intermediary between the luminance control signal and the light emission driver. It processes the luminance level information, references the correspondence information to determine the appropriate light emission cycle, and generates the corresponding control signals. This intermediary function ensures smooth transitions and maintains display stability by coordinating the relationship between luminance adjustments and emission cycle changes.
Data Source
AI summary
A display device includes: a display panel including pixels connected to light emission control lines; a light emission driver connected to the display panel through the light emission control lines; and a timing controller which controls the light emission driver to display an image in a first light emission cycle when the display panel is driven at a first luminance level, and to display an image in a second light emission cycle when the display panel is driven at a second luminance level. The timing controller controls the light emission driver to display an image in a third light emission cycle between the first and second light emission cycles during a transition period when a luminance level of the display panel is changed from the first luminance level to the second luminance level, and to display an image in the second light emission cycle after the transition period.