OLED Driving Voltage Adjustment for Luminance and Power Trade-off
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Solution Overview
Problem
Display devices, such as OLEDs, face challenges in maintaining luminance and reducing power consumption due to pixel degradation, where the length of the emission duty cycle is limited, affecting the representation of grayscale levels and overall image quality.
Innovation Solution
A display device and method that include a gamma generator, panel load calculator, target driving voltage determiner, emission duty controller, and driving voltage generator to adjust the emission duty and driving voltage based on calculated load and target global current, using scale factors to optimize current flow and luminance, while compensating for pixel degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the emission duty cycle is increased to compensate for pixel degradation, then the luminance is improved, but the power consumption increases
Solution Approach 1:
The patent changes the driving voltage parameter to compensate for pixel degradation instead of increasing emission duty cycle. The voltage compensation unit adjusts the voltage level dynamically based on pixel degradation status, achieving luminance compensation while maintaining lower power consumption compared to emission duty extension
Solution Approach 2:
The system dynamically adjusts the driving voltage based on real-time pixel degradation feedback. The voltage compensation unit continuously monitors and modifies voltage levels to optimize both luminance output and power efficiency, making the compensation adaptive rather than static
2Illumination intensity
If the driving voltage is increased to improve luminance, then the grayscale representation is improved, but the power consumption increases
Solution Approach 1:
The patent implements precise voltage parameter adjustment through the voltage compensation unit, which modifies driving voltage levels to achieve optimal luminance and grayscale representation while minimizing power consumption increases
3Reliability
If the emission duty cycle is extended to compensate for degraded pixels, then the image quality is improved, but the maximum luminance is reduced due to duty cycle limits
Solution Approach 1:
The patent transitions from emission duty cycle adjustment to driving voltage adjustment for pixel degradation compensation. This parameter change enables maintaining higher maximum luminance while improving image quality, as voltage compensation does not suffer from the same duty cycle limitations
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 increases the maximum luminance of light emitted from pixels by adjusting the driving voltage and reduces power consumption by optimizing the emission duty cycle, ensuring effective grayscale representation and improved image quality despite pixel degradation.
Implementation Method 1
a (k)th light emitting diode configured to emit light based on the (k)th driving current
Data Source
AI summary
A display device and a method of driving the same are disclosed. In one aspect, the display device includes a gamma generator configured to generate emission duty data having an emission duty period based on input image data, a panel load calculator configured to calculate a load of the display panel, and a target driving voltage determiner configured to determine a target driving voltage. The display device also includes an emission duty controller configured to adjust the emission duty period and determine a target global current, driver configured to drive the display panel, and a driving voltage generator configured to supply the driving voltage to the display panel, measure driving currents flowing into the display panel, and adjust the driving voltage to include the target driving voltage based on the difference between the sum of the measured driving currents and the target global current.