OLED Luminance Control via Dynamic Voltage Adjustment
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Solution Overview
Problem
Current OLED display panels face challenges in maintaining high image quality and uniform luminance, especially as panel size increases, due to variations in threshold voltages and power source voltages, leading to inefficient power consumption and manufacturing difficulties in producing large, high-precision screens.
Innovation Solution
A test device and method that include a luminance measurement unit and a controller to adjust the driving voltage of OLED display panels, ensuring that the measured luminance matches a target value by adjusting the power source voltage within a specific range, thereby reducing power consumption and preventing defects like stain defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the area of the display panel is increased, then the visibility and coverage are improved, but the power consumption increases and manufacturing precision deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the power source voltage based on measured luminance values. The controller modifies voltage parameters to optimize power consumption while maintaining required luminance levels across different panel areas and conditions
Solution Approach 2:
The patent implements feedback control by measuring actual luminance values with a luminance measurement unit and using this information to adjust power source voltage. This closed-loop feedback system optimizes power consumption by avoiding excessive voltage application, particularly important for large-area panels
2Area of stationary object
If the area of the display panel is increased, then the visibility and coverage are improved, but the manufacturing precision and luminance uniformity deteriorate
Solution Approach 1:
The patent adjusts power source voltage parameters based on spatially-resolved luminance measurements to compensate for manufacturing variations. By modifying voltage parameters locally or globally based on measured deviations, the system achieves uniform luminance output across large-area panels despite manufacturing tolerances
Solution Approach 2:
The luminance measurement unit provides feedback on actual luminance distribution across the panel, enabling the controller to compensate for manufacturing variations. This feedback mechanism allows large-area panels to achieve uniform luminance by dynamically adjusting operating parameters based on measured performance
3Illumination intensity
If the power source voltage is increased to maintain luminance, then the luminance output is improved, but the power consumption increases
Solution Approach 1:
The patent optimizes the power source voltage parameter to achieve the minimum voltage required for target luminance output. Rather than applying fixed high voltage, the system dynamically adjusts voltage parameters to match actual luminance requirements, reducing power consumption while maintaining adequate luminance levels
Solution Approach 2:
The luminance measurement unit provides feedback on actual luminance output, enabling the controller to adjust power source voltage to the minimum level needed to achieve target luminance. This feedback control prevents excessive voltage application and the associated power waste, particularly important for energy-efficient display operation
4Manufacturing precision
If the threshold voltage variation is compensated by increasing power source voltage, then the luminance uniformity is improved, but the power consumption increases
Solution Approach 1:
The patent uses feedback from luminance measurements to determine the actual voltage compensation needed for threshold voltage variations. Rather than applying fixed high voltage to all pixels, the system measures actual luminance output and adjusts voltage parameters only to the extent necessary to achieve uniformity, minimizing power consumption penalties
Solution Approach 2:
The patent dynamically adjusts power source voltage parameters based on measured luminance variations rather than applying uniform high voltage. By modifying voltage parameters selectively and only to the extent needed for compensation, the system achieves luminance uniformity while minimizing additional power consumption
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
The solution effectively reduces power consumption and maintains high image quality by automatically controlling the driving voltage, ensuring uniform luminance across the display panel, even under varying internal and external conditions, thus enhancing the manufacturing and operational efficiency of OLED displays.
Implementation Method 1
OLED displays display images using OLEDs that generate light by a recombination of electrons and holes
Data Source
AI summary
A test device for a display panel and a method of testing the same are provided. The test device for a display panel includes a luminance measurement unit that measures a luminance value of a display panel including a plurality of pixels, and a controller that determines a voltage value of a data signal corresponding to a target luminance value, receives a measured luminance value of a pixel to which the data signal is supplied from the luminance measurement unit from among the plurality of pixels, compares the measured luminance value and the target luminance value, and outputs a control signal that changes a first power source voltage value supplied from a power source voltage supply unit to the pixel until the measured luminance value does not coincide with the target luminance value.