OLED Logo Area Afterimage Prevention via Periodic Brightness Modulation
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Solution Overview
Problem
Existing OLED display devices suffer from afterimages in logo areas due to organic light emitting diode deterioration, which current methods to lower brightness in these areas compromise image quality and do not address the underlying cause.
Innovation Solution
An OLED display device with a logo area detection unit and data signal modulation unit that applies alternating higher and lower brightness data signals to pixels in logo areas, maintaining an average brightness equal to the reference brightness, thereby preventing afterimages while preserving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If brightness in the logo area is lowered to prevent afterimage, then afterimage is reduced, but image quality in the logo area is also lowered
Solution Approach 1:
The patent applies periodic action by alternately setting pixel values to first and second values across different frames. Specifically, in odd frames the pixel value is set to the first value (higher brightness), and in even frames it is set to the second value (lower brightness). This periodic alternation prevents afterimage accumulation while maintaining perceived image quality through temporal averaging, directly resolving the contradiction between afterimage prevention and image quality preservation.
2Reliability
If brightness in the logo area is lowered without considering surrounding areas, then afterimage is reduced, but the logo area appears darker relative to surrounding areas
Solution Approach 1:
The periodic alternation of pixel values between first and second values across frames ensures that over time, the logo area maintains its proper visual relationship with surrounding areas. The temporal averaging effect makes the logo area appear consistent with surrounding areas while still preventing afterimage, resolving the visual consistency issue.
3Stability of the object's composition
If the same data is continuously provided to logo area pixels, then image consistency is maintained, but organic light emitting diode deterioration occurs causing afterimage
Solution Approach 1:
The patent implements periodic variation in data provided to logo area pixels by alternating between first and second values across frames. This periodic change prevents continuous stress on the same OLED pixels, reducing deterioration while maintaining perceived image consistency through temporal averaging, thus resolving the contradiction between image consistency and OLED durability.
Solution Approach 2:
The patent changes the parameter of pixel data values from a static same value to dynamically alternating first and second values. This parameter change reduces cumulative stress on OLED pixels in the logo area, preventing deterioration and afterimage while maintaining visual consistency through the alternating pattern.
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
Prevents afterimages caused by organic light emitting diode deterioration in logo areas without compromising image quality or visibility, by modulating data signals to maintain consistent average brightness, thus addressing the root cause of the issue.
Implementation Method 1
an organic light emitting diode in the pixel emits light with the same brightness La
Data Source
AI summary
An organic light emitting diode display device includes a display panel including pixels that each include an organic light emitting diode; a logo area detection unit detecting a logo area of the display panel; and a data signal modulation unit applying a first data signal to at least one pixel in the logo area during at least one frame and applying a second data signal to the at least one pixel in the logo area during another frame, wherein a first brightness corresponding to the first data signal is higher than a reference brightness of the at least one pixel in the logo area, a second brightness corresponding to the second data signal is lower than the reference brightness, and an average of the first brightness and the second brightness every frame is equal to the reference.