Dynamic Illumination Persistence for OLED Display Devices
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Solution Overview
Problem
Conventional display devices, such as OLEDs, illuminate each pixel row for a fixed period regardless of the dynamic range of luminance in the image or video, leading to suboptimal brightness control and potential inefficiencies in energy usage.
Innovation Solution
A method for dynamically controlling the illumination time of each pixel row in an OLED display device, where the time period for emitting light is adjusted based on the brightness level of the video frame, allowing for varying illumination times for different pixel rows within a frame, and potentially across frames, using counter circuits to enable pixels for specific time periods aligned with the clock signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If each pixel row is illuminated for a fixed period based on refresh rate, then the display can maintain simple timing control and consistent scanning, but the brightness control precision deteriorates and energy efficiency decreases for images with wide dynamic range luminance
Solution Approach 1:
The patent applies dynamics by transitioning from fixed illumination time to variable illumination time. The illumination time for each pixel row is dynamically adjusted based on the luminance level of the displayed image, allowing the system to adapt to different brightness requirements while maintaining simple timing control architecture.
Solution Approach 2:
The patent changes the parameter of illumination time from a fixed value to a variable value that depends on the image luminance. By modifying this temporal parameter dynamically, the system achieves precise brightness control for different pixel rows without complicating the overall timing control mechanism.
2Stability of the object's composition
If each pixel row is illuminated for a fixed period, then the display maintains consistent scanning behavior, but energy efficiency deteriorates when displaying images with wide dynamic range luminance
Solution Approach 1:
The system dynamically adjusts illumination time based on image content while preserving the overall scanning consistency. The scan driver maintains the sequential scanning pattern but varies the illumination duration of each row according to luminance requirements, optimizing energy consumption without disrupting scanning stability.
Solution Approach 2:
The illumination time parameter is changed from fixed to variable based on luminance levels. This allows the display to reduce illumination time for dark regions and increase it for bright regions, thereby improving energy efficiency while maintaining consistent scanning behavior across different image types.
3Device complexity
If fixed illumination time is used for all pixel rows, then the display device structure remains simple, but the ability to display wide dynamic range luminance deteriorates
Solution Approach 1:
The patent introduces dynamic illumination time control that adapts to different luminance levels in the displayed image. This dynamic adjustment enables the display to handle wide dynamic range content effectively while keeping the overall device structure simple, as the variability is introduced through software/control logic rather than hardware complexity.
Solution Approach 2:
The system changes the illumination time parameter dynamically based on the luminance of each pixel row. This parameter modification enables the display to accurately represent wide dynamic range luminance without requiring complex hardware modifications, maintaining structural simplicity while enhancing adaptability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances brightness control and energy efficiency by ensuring that pixel rows with higher brightness levels are illuminated for longer periods, improving the display of videos with wide dynamic range luminance, particularly beneficial in scenarios like outdoor images with varying lighting conditions.
Implementation Method 1
organic light emitting diode (OLED) display device
Implementation Method 2
each pixel row of the display is displayed sequentially from top to bottom
Data Source
AI summary
A method for dynamically illuminating each pixel row of a display device (e.g., an organic light emitting diode display device) for a given video frame is described. For every video frame, the method comprises enabling the driving of a first row of pixels of the display device for a first time period, where the first row of pixels emits light during the first time period. The method also includes enabling the driving of a second row of pixels of the display device for a second time period, where the second row of pixels emits light during the second time period, and the second time period is different (larger or smaller) from the first time period. The first and second time periods may be dynamically adjusted depending on the image to be displayed.