Display Voltage Setting by Maximum Luminance for Consistent Emission
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Solution Overview
Problem
Display devices formed on a mother substrate exhibit varying driving characteristics, leading to inconsistent light emission when uniform voltages are applied, resulting in unnecessary power consumption and suboptimal luminance.
Innovation Solution
A voltage-setting method that adjusts emission duty ratios, power voltages, and black data voltages based on maximum luminances, using interpolation and repeated testing to optimize voltage settings for individual display devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If voltages having the same magnitude are collectively set with respect to all the display devices, then the manufacturing cost is reduced, but the luminance consistency deteriorates
Solution Approach 1:
The patent applies local quality by setting different voltage values for different display devices based on their individual maximum luminance characteristics. Instead of using a uniform voltage for all devices, the system measures and determines specific voltage values tailored to each device's luminance properties, thereby achieving consistent luminance output across devices with varying manufacturing characteristics.
2Manufacturing precision
If voltages are set to have a large voltage margin, then the luminance consistency is improved, but the power consumption increases
Solution Approach 1:
The patent employs parameter changes by dynamically adjusting voltage values based on measured maximum luminance characteristics of each display device. The system determines optimal voltage parameters that achieve consistent luminance without requiring excessive voltage margins, thereby reducing power consumption while maintaining luminance consistency across different devices.
3Device complexity
If uniform voltages are applied to all display devices, then the device complexity is reduced, but the driving characteristics consistency deteriorates
Solution Approach 1:
The patent applies preliminary action by measuring and determining the maximum luminance characteristics of each display device before operational use. This preliminary characterization allows the system to pre-calculate and store device-specific voltage values, ensuring consistent driving characteristics without adding complexity to the operational voltage setting process.
Data Source
AI summary
There is provided a voltage-setting method for a display for displaying an image based on a selected maximum luminance among maximum luminances, the voltage-setting method including setting emission duty ratios with respect to the maximum luminances, setting first power voltages with respect to the maximum luminances based on a first maximum luminance, setting black data voltages with respect to the maximum luminances based on a second maximum luminance, and setting difference values of anode initialization voltages and the first power voltages with respect to ones of the maximum luminances other than the second maximum luminance based on a third maximum luminance and a fourth maximum luminance.