Self-luminous Display Sticking Correction via Deterioration Ratio
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Solution Overview
Problem
Existing correction methods for the 'sticking phenomenon' in self-luminous displays, such as organic EL displays, either fail to address the fundamental cause of the issue, lead to accelerated deterioration, consume power unnecessarily, or do not guarantee effective correction due to incorrect assumptions about light emission characteristics.
Innovation Solution
A method that calculates and corrects the deterioration difference between pixels using a deterioration ratio derived from actual light emission characteristics, allowing for accurate adjustment of gradation values to eliminate the difference while the display is in use, thereby preventing power wastage and ensuring effective correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If correction display is executed only in a non-used state with increased luminance and time period, then the sticking phenomenon is corrected, but power is wasted and deterioration is accelerated
Solution Approach 1:
The patent calculates deterioration amounts and determines correction values in advance during the normal display period, before the correction period begins. This preliminary calculation allows the correction to be applied efficiently without requiring extended high-luminance operation, thereby reducing power consumption while maintaining correction effectiveness.
Solution Approach 2:
The patent dynamically adjusts the correction strategy by calculating deterioration amounts based on actual display history and luminance conditions. The correction period luminance and time period are optimized based on calculated deterioration amounts rather than using fixed high values, enabling adaptive power management that reduces energy waste while achieving correction goals.
2Reliability
If correction display is executed with high luminance for extended time period, then the sticking phenomenon is corrected, but element deterioration is accelerated
Solution Approach 1:
The patent performs preliminary calculation of deterioration amounts during the normal display period using accumulated display history. This advance calculation determines the precise correction values needed, allowing the correction period to use minimal necessary luminance and time period settings, thereby avoiding accelerated deterioration while achieving effective correction.
Solution Approach 2:
The patent changes the parameters of luminance and time period in the correction period based on calculated deterioration amounts rather than using fixed high values. By dynamically adjusting these parameters to match the actual deterioration level, the patent achieves correction effectiveness while minimizing the acceleration of element deterioration.
3Ease of manufacture
If uniform correction time period is applied to all pixels, then the correction process is simple, but pixels with different deterioration levels are not corrected effectively
Solution Approach 1:
The patent applies local quality by calculating and applying individual correction values to each pixel based on its specific deterioration amount. The correction time period for each pixel is determined by its calculated deterioration level rather than using a uniform value, ensuring that each pixel receives precisely the correction it needs for effective sticking phenomenon correction.
4Device complexity
If correction values are calculated based on incorrect assumptions about light emission characteristics, then the correction process is simplified, but correction effectiveness is reduced
Solution Approach 1:
The patent incorporates feedback by using actual display history and measured luminance conditions to calculate deterioration amounts. This feedback mechanism ensures that correction values are based on real operating conditions rather than incorrect assumptions, significantly improving correction effectiveness while the systematic calculation approach maintains reasonable process complexity.
Data Source
AI summary
A self-luminous apparatus is disclosed wherein a deterioration amount difference between different pixels can be eliminated accurately to correct a sticking phenomenon while the self-luminous apparatus is used. In the self-luminous apparatus, a deterioration amount difference appearing between a correction object pixel and a reference pixel within a first light emission period of time is calculated first using a deterioration ratio derived from gradation values of the pixels. Then, a deterioration ratio for correction for the correction object pixel necessary to eliminate the calculated deterioration amount difference within a second light emission period of time is derived using a deterioration ratio of the reference pixel. Thereafter, the derived deterioration ratio for correction is converted into a corresponding gradation value, and the correction object pixel is driven to emit light with the converted gradation value.