Display Device Burn-In Correction via Detection Region Segmentation
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Solution Overview
Problem
Self-light emitting display devices, such as those using organic EL elements, suffer from degradation over time, leading to burn-in patterns and requiring lengthy burn-in correction processes that disrupt display functionality, especially when power is first supplied, causing user inconvenience in applications like mobile phones and digital cameras.
Innovation Solution
The solution involves detecting electric current during power supply but limiting the detection to a 'necessity-minimum' region, allowing immediate display initiation and utilizing the retracing period for comprehensive burn-in correction, thereby minimizing detection time and avoiding burn-in recognition by human eyes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If burn-in correction is performed on the whole screen at power supply time, then correction completeness is improved, but detection time is prolonged causing display delay
Solution Approach 1:
The patent divides the screen into a detection region (where burn-in correction is performed) and a non-detection region (where display is immediately restored). This segmentation allows the system to focus correction efforts on critical areas while maintaining overall display functionality, resolving the contradiction between correction completeness and detection time.
2Illumination intensity
If detection is performed during display period, then user observes display continuously, but detection accuracy is reduced due to display interference
Solution Approach 1:
The patent implements periodic detection during the retrace period, which occurs naturally in the display refresh cycle. This allows detection to be performed periodically without continuous interruption of the display, maintaining both display visibility and detection accuracy by utilizing the natural periodic gaps in the display refresh process.
3Measurement precision
If fixed current is applied via signal line for detection, then detection capability is improved, but display function is lost during detection
Solution Approach 1:
The patent separates the display region from the detection region, allowing fixed current to be applied only to the detection region via the signal line. This segmentation enables voltage detection in the detection region while the non-detection region continues to display normally, resolving the contradiction between detection capability and display functionality.
Solution Approach 2:
The patent uses the retrace period as an intermediary time window to perform detection operations. During this brief period between display refresh cycles, the system can apply fixed current for detection without permanently disrupting the display function, as the display will resume immediately after the retrace period ends.
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 enables rapid burn-in correction and stable display with minimal characteristic fluctuations, ensuring immediate display functionality and reduced user inconvenience by focusing detection on critical regions and utilizing retracing periods for comprehensive correction.
Implementation Method 1
A self light emitting element represented by an EL (electroluminescence) element, an organic EL element or the like has a property that the light-emission brightness is proportional to a quantity of electric current which flows in the self light emitting element
Data Source
AI summary
Detection voltages of self light emitting elements in a self-luminous display panel are detected by a detection circuit through a selection switch in a data line drive circuit via pixel detection switches and interactive signal lines. The detection operation is performed by making use of a power source supply time and a retracing period.