Display Panel Black Voltage Setting for Luminance and Power Balance
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Solution Overview
Problem
Display devices exhibit varying luminance levels due to manufacturing differences, necessitating a specific black voltage setting for each panel to ensure uniformity and reduce power consumption.
Innovation Solution
A method for setting the black voltage involves determining a first and second maximum black voltage through simulation, adjusting a bias voltage, and incrementally increasing a preliminary black voltage until desired luminance is achieved, with the black voltage being set based on these values to minimize power consumption and reduce data voltage swings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a higher black voltage is used to ensure sufficient current cutoff and luminance uniformity, then display uniformity is improved, but power consumption increases
Solution Approach 1:
The patent applies parameter changes by determining a first maximum black voltage through simulation and then setting an actual black voltage lower than this simulated value. This parameter adjustment allows the display to achieve sufficient luminance uniformity while consuming less power, as the actual black voltage is optimized based on simulation results rather than using a conservative higher value.
Solution Approach 2:
The patent uses simulation to determine the first maximum black voltage before actual operation. This preliminary action allows the system to pre-calculate the optimal voltage threshold, enabling subsequent operation at a lower, more power-efficient black voltage setting while maintaining performance requirements.
2Stability of the object's composition
If a higher black voltage is set to compensate for manufacturing variations, then luminance consistency across panels is improved, but data voltage swing magnitude increases
Solution Approach 1:
The patent changes the voltage parameter by setting the black voltage lower than the first maximum black voltage determined through simulation. This parameter optimization reduces the voltage swing magnitude while maintaining luminance consistency, as the simulation identifies the true threshold needed for uniformity rather than using excessive voltage margins.
3Use of energy by moving object
If simulation-based voltage determination is used to optimize black voltage, then power consumption is reduced, but measurement and detection complexity increases
Solution Approach 1:
The patent performs simulation to determine the first maximum black voltage as a preliminary action before actual device operation. This upfront computational effort simplifies subsequent operation by establishing a precise voltage threshold, reducing the need for complex real-time measurements and adjustments during actual display operation.
Solution Approach 2:
The patent uses simulation to create a virtual model of the pixel behavior to determine the first maximum black voltage. This copying approach allows optimization of the black voltage parameter in the virtual model, which then guides the actual device operation, reducing power consumption without requiring complex physical measurements.
Data Source
AI summary
A method for setting a black voltage in a display device, including: determining a first maximum black voltage through simulation of a pixel in a display panel; determining a second maximum black voltage that is less than the first maximum black voltage; determining a bias voltage based on the second maximum black voltage; measuring luminance of the display panel by applying a preliminary black voltage and the bias voltage to the pixel; increasing the preliminary black voltage until the luminance becomes lower than a reference luminance; and when the luminance is lower than the reference luminance, determining a black voltage based on the preliminary black voltage.