Display Black Voltage Offsets for Uniform Luminance Control
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Solution Overview
Problem
Display devices formed on a mother substrate may have varying driving characteristics due to their positions, leading to inconsistent luminance when set with the same voltage, resulting in unnecessary power consumption and potential black floating issues.
Innovation Solution
A voltage setting method that applies a first black data voltage and sets offsets for different maximum luminances, adjusting power voltages and emission duty ratios to optimize luminance and prevent black floating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the same voltage is applied to all display devices, then manufacturing cost is reduced, but luminance consistency deteriorates
Solution Approach 1:
The patent applies local quality by setting different black data voltages for different display devices based on their position on the mother substrate. Devices at different positions receive customized voltage values to compensate for position-dependent manufacturing variations, achieving uniform luminance across all devices while maintaining cost-effective batch production
2Manufacturing precision
If a margin is increased between applied voltages, then luminance consistency is improved, but power consumption increases
Solution Approach 1:
The patent changes the voltage parameter dynamically by determining optimal black data voltages through measurement and calculation processes. Instead of using a fixed conservative margin, the system calculates precise voltage values based on actual device characteristics, achieving luminance consistency without excessive power consumption
3Manufacturing precision
If position-dependent voltage adjustment is implemented, then luminance consistency is improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-determining black data voltage values for each display device position during the manufacturing process. The voltages are calculated and stored in advance based on position-dependent characteristics, eliminating the need for complex real-time adjustments and simplifying the overall system complexity
Data Source
AI summary
A voltage setting method for a display device includes applying a first black data voltage corresponding to a first maximum luminance of a plurality of maximum luminances while measuring a luminance of the display device; setting a second offset for a second maximum luminance of the plurality of maximum luminances, which corresponds to a first luminance period in which an emission duty ratio is varied, the second offset being a difference between the first black data voltage and a second black data voltage corresponding to the second maximum luminance; similarly setting a third offset for a third maximum luminance of the plurality of maximum luminances; and setting offsets corresponding to remaining maximum luminances except the first to third maximum luminances, based on the first black data voltage for the first maximum luminance, the second offset for the second maximum luminance, and the third offset for the third maximum luminance.