WRGB OLED Pixel Load Distribution for Burn-in Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
OLED display devices suffer from degradation and burn-in due to continuous light emission from specific sub-pixels, leading to reduced lifespan and color expressiveness, especially when displaying fixed images.
Innovation Solution
Implementing a WRGB-based OLED pixel structure that distributes load to other sub-pixels and adjusts data values with a time difference, using a controller to adjust white data values based on red, green, and blue sub-pixel values to prevent overloading and flicker, while maintaining color integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a current continuously flows through a specific light-emitting element for a long time, then the light emission function is maintained, but the lifespan of the light-emitting element decreases and color expressiveness is degraded
Solution Approach 1:
The pixel is divided into multiple sub-pixels (red, green, blue, and white sub-pixels) instead of using only three sub-pixels. This segmentation allows the load to be distributed across more elements, reducing the stress on any single sub-pixel and thereby extending its lifespan while maintaining light emission capability.
Solution Approach 2:
A white sub-pixel is added to the traditional RGB structure, creating a WRGB configuration. The white sub-pixel can be combined with or replace the emission from red, green, and blue sub-pixels under controller management, providing an additional pathway for light emission that reduces the burden on individual colored sub-pixels.
2Ease of operation
If the same data value is applied to red, green, blue, and white sub-pixels simultaneously, then the control simplicity is maintained, but flicker occurs due to synchronized adjustment
Solution Approach 1:
The controller adjusts the data values of the white sub-pixel and colored sub-pixels at different timings rather than simultaneously. This periodic, staggered adjustment strategy eliminates synchronized changes that cause flicker, while the controller maintains overall control simplicity by managing these timing differences internally.
3Reliability
If the white sub-pixel is used to compensate for degraded sub-pixels, then the color expressiveness is maintained, but the complexity of data value adjustment increases
Solution Approach 1:
The controller monitors the degradation status of individual sub-pixels and dynamically adjusts the data values of the white sub-pixel and other colored sub-pixels accordingly. This feedback mechanism allows the system to maintain color expressiveness by compensating for degraded sub-pixels using the white sub-pixel, while the controller manages the increased complexity through intelligent algorithms.
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 effectively prevents residual images and degradation of specific sub-pixels, enhancing the lifespan and color expressiveness of OLED display devices without altering the pixel's color, and reduces the occurrence of flicker.
Implementation Method 1
an organic light emitting diode (hereinafter, referred to as 'OLED') display device
Data Source
AI summary
Embodiments provide an OLED display device and a method of operating the same, which distribute a load to sub-pixels other than a specific sub-pixel such that the specific sub-pixel is not overloaded by using a WRGB-based OLED pixel structure, preventing a residual image and degradation of the specific sub-pixel, which may occur in the OLED display device.