Electroluminescent Display Driving with Dynamic Voltage Adjustment
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Solution Overview
Problem
Electroluminescent displays face increased power consumption and degraded image quality due to ohmic drops and temperature fluctuations, especially as the size of the display panel increases and the resolution becomes higher, making it challenging to maintain uniform gate-source voltages for turning on and off driving transistors.
Innovation Solution
A method of driving electroluminescent displays that involves digitally controlling the high and low data voltages based on current detection signals, adjusting the power supply voltages, and using a voltage controller to calculate target voltage levels, ensuring uniform gate-source voltages for each pixel, thereby reducing power consumption and enhancing image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the size of the display panel is increased and resolution is enhanced, then the display quality is improved, but power consumption increases and image quality degrades due to ohmic drops
Solution Approach 1:
The patent implements dynamic voltage adjustment by sensing the actual voltage at each pixel location and adjusting the data voltage in real-time to compensate for ohmic drops. This dynamic compensation mechanism allows the display to maintain uniform gate-source voltages across all pixels even as panel size and resolution increase, thereby preventing the power consumption increase that would normally result from higher voltage requirements.
2Manufacturing precision
If the size of the display panel is increased and resolution is enhanced, then the display quality is improved, but image quality degrades due to ohmic drops and temperature fluctuations
Solution Approach 1:
The patent employs a feedback mechanism where the voltage sensing unit continuously monitors the actual voltage at each pixel location and feeds this information back to the voltage adjustment unit. This closed-loop control system dynamically adjusts the data voltage to compensate for ohmic drops and temperature fluctuations, ensuring uniform gate-source voltages across all pixels and maintaining consistent image quality throughout the display panel.
Solution Approach 2:
The patent applies local voltage compensation by adjusting the data voltage individually for each pixel or pixel group based on its specific location and actual voltage conditions. This localized approach allows different regions of the display panel to receive customized voltage adjustments, compensating for position-dependent ohmic drops and temperature variations, thereby maintaining uniform image quality across the entire panel.
3Device complexity
If fixed voltage levels are used for digital driving, then the IC structure is simplified, but uniform gate-source voltages cannot be maintained under varying brightness conditions
Solution Approach 1:
The patent changes the voltage parameter dynamically based on sensed conditions rather than using fixed voltage levels. The voltage adjustment unit modifies the data voltage magnitude according to the sensed voltage and brightness conditions, allowing the system to maintain uniform gate-source voltages across different brightness levels while keeping the overall IC structure relatively simple through the use of standard digital driving architecture.
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 method effectively reduces power consumption and enhances the quality of displayed images by maintaining uniform gate-source voltages for turning on and off the driving transistors, even under varying brightness conditions, thus improving the overall performance of electroluminescent displays.
Implementation Method 1
electroluminescent displays have quick response speeds and reduced power consumption, using light-emitting diodes (LEDs) or organic light-emitting diodes (OLEDs) that emit light through recombination of electrons and holes
Implementation Method 2
an actual voltage at each pixel may be sensed by sensing a current
Data Source
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AI summary
An electroluminescent display and method of driving electroluminescent display are disclosed. In one aspect, the method includes digitally driving a display panel including a plurality of pixels based on a first power supply voltage, a second power supply voltage lower than the first power supply voltage, a first data voltage and a second data voltage lower than the first data voltage. The method also includes sensing a total current provided to the display panel, generating a current detection signal based on the sensed total current, and varying at least one of the first and second data voltages based on the current detection signal.