OLED Screen Brightness Adjustment via EM Signal Pulse Segmentation
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Solution Overview
Problem
Current EM dimming methods in OLED displays suffer from low dimming precision and smoothness due to simultaneous adjustment of pulse widths, leading to large spans between brightness levels and user experience issues like image jumping and flickering.
Innovation Solution
A method that adjusts the pulse width of individual pulses in the EM signal to control the number of pixel rows lit up, allowing for more precise and smooth brightness adjustments by calculating the required number of pixel rows and adjusting the duty cycle accordingly, ensuring a smaller adjustment amount and uniformity in image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pulse widths of all pulses in the EM signal are adjusted simultaneously, then the quantity of pixel rows controlled by the pulse increases greatly, but the span between brightness levels becomes large resulting in low dimming precision
Solution Approach 1:
The patent segments the EM signal into multiple pulses, where each pulse controls a specific number of pixel rows. Instead of adjusting all pulses simultaneously, the method adjusts individual pulses independently based on the target brightness level. This segmentation allows for finer control granularity, enabling precise dimming by controlling the number of pixel rows lit up in each pulse, thereby resolving the contradiction between adjustment speed and dimming precision.
2Productivity
If pulse widths of all pulses in the EM signal are adjusted simultaneously, then the quantity of pixel rows controlled increases, but the smoothness of brightness adjustment deteriorates causing image jumping and flickering
Solution Approach 1:
By segmenting the control into individual pulses with different pixel row assignments, the patent enables smooth transitions between brightness levels. Each pulse can be adjusted independently to maintain continuous and uniform image display, preventing the image jumping and flickering that occur when all pulses are adjusted simultaneously.
Solution Approach 2:
The patent applies local quality by allowing different pulses to have different numbers of pixel rows controlled based on their position and the target brightness level. This non-uniform distribution of controlled pixel rows across pulses enables fine-grained control over the brightness transition, ensuring smooth image display while maintaining adjustment efficiency.
3Device complexity
If the quantity of pixel rows controlled by each pulse is increased, then fewer pulses are needed, but the minimum reachable brightness increases reducing dimming precision
Solution Approach 1:
The patent maintains a larger number of pulses with each pulse controlling a smaller number of pixel rows. This segmentation strategy allows the system to achieve lower minimum brightness levels while keeping the overall control structure manageable. By distributing the control across multiple pulses rather than using fewer pulses with larger pixel row assignments, the patent achieves both low complexity and high precision.
Data Source
AI summary
A screen brightness adjustment method includes determining target brightness, determining a quantity of pixel rows controlled by each pulse in an emission (EM) signal required for implementing the target brightness, adjusting a pulse width of a pulse in a current EM signal based on the quantity of pixel rows controlled by each pulse in the EM signal required for implementing the target brightness to change a duty cycle of the EM signal, where the duty cycle reflects a quantity of pixel rows that are lit up and controlled by the EM signal.