Display Pixel Initialization Voltage Control for Luminance Uniformity
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Solution Overview
Problem
Display devices experience luminance differences due to variable driving frequencies, leading to inconsistent image quality and increased power consumption.
Innovation Solution
A display device and method that adjust the voltage levels of initialization and data voltages during overlapping periods of active and initialization periods to compensate for driving current, reducing luminance differences by optimizing pixel luminance across varying frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the display device is driven at a high driving frequency, then the display device may provide high quality images, but power consumption of the display device increases
Solution Approach 1:
The patent implements dynamic adjustment of the initialization voltage level based on the driving frequency. The power manager dynamically selects between first and second voltage levels for the initialization voltage depending on whether the driving frequency is above or below a reference frequency, allowing the system to adapt its power consumption characteristics to the required image quality level.
2Use of energy by moving object
If the display device is driven at a low driving frequency, then power consumption of the display device may be reduced, but the display device may not provide high quality images
Solution Approach 1:
The patent changes the voltage level parameter of the initialization signal based on the driving frequency. When operated at low driving frequencies, the power manager applies a higher initialization voltage level to compensate for the reduced refresh rate, thereby maintaining adequate image quality while still benefiting from lower power consumption compared to high-frequency operation.
3Illumination intensity
If the voltage level of the initialization voltage is increased, then the luminance difference within the display panel may be reduced, but the power consumption increases
Solution Approach 1:
The power manager dynamically adjusts the initialization voltage level based on the driving frequency rather than using a fixed high voltage level. This dynamic approach ensures luminance uniformity is maintained when needed (at low frequencies) while avoiding unnecessary power consumption at high frequencies where the reference voltage level is sufficient.
4Use of energy by moving object
If the voltage level of the initialization voltage is decreased, then the power consumption may be reduced, but the luminance difference within the display panel increases
Solution Approach 1:
The patent implements conditional parameter changes where the initialization voltage level is adjusted based on the driving frequency. The power manager switches between voltage levels to optimize the balance between power consumption and luminance uniformity, ensuring adequate initialization voltage is applied only when the driving frequency requires it.
Data Source
AI summary
A display device includes a display panel including a pixel, a gate driver to provide a scan signal and a sensing signal to the pixel, a data driver to provide a data voltage to the pixel, a power manager to provide an initialization voltage to the pixel, and a controller to control the gate driver, the data driver, and the power manager. The gate driver provides the scan signal and the sensing signal to the pixel in an active period, and provides the sensing signal to the pixel in an initialization period. The controller determines an overlapping period in which the active period and the initialization period overlap each other based on a progress time of the initialization period at a start time point of the active period. The power manager changes a voltage level of the initialization voltage in the overlapping period.