Display Panel Voltage Control for Low-Luminance Image Quality
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Solution Overview
Problem
Existing display devices struggle to maintain image quality at low luminance levels, particularly in preventing black luminance from increasing and improving response speed and temperature characteristics.
Innovation Solution
A display device that determines the difference between a first initialization voltage and a first power voltage based on input luminance, adjusting these voltages to maintain optimal luminance and image quality by integrating a driving controller to manage power and data drivers, and incorporating a power voltage generator to provide constant and variable power voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the first power voltage is increased to improve luminance output, then the luminance increases, but the black luminance increases and image quality deteriorates at low luminance levels
Solution Approach 1:
The patent implements dynamic voltage adjustment by making the first power voltage variable based on input luminance levels. The driving controller dynamically determines the first power voltage according to the display luminance, allowing the voltage to adapt to different operating conditions. This resolves the contradiction by enabling high luminance when needed while maintaining low black luminance when the display luminance is low, thus preserving image quality across different luminance ranges.
Solution Approach 2:
The patent changes the parameter of the first power voltage from a fixed value to a variable value that depends on the input luminance. By establishing a relationship where the first power voltage is determined based on the display luminance, the system can adjust the voltage parameter to optimize both luminance output and image quality. When display luminance is low, the first power voltage is reduced to prevent black luminance increase, while maintaining sufficient voltage when high luminance is required.
2Speed
If the difference between the first initialization voltage and the first power voltage is increased to improve response speed, then the response speed increases, but the temperature characteristics deteriorate
Solution Approach 1:
The patent implements dynamic adjustment of the voltage difference by making both the first initialization voltage and the first power voltage variable parameters. The driving controller dynamically determines these voltages based on the input luminance, allowing the difference between them to adapt to different operating conditions. This resolves the contradiction by enabling a larger voltage difference (faster response) when temperature characteristics permit, while reducing the voltage difference when temperature control is critical, thus maintaining acceptable temperature characteristics across different operating conditions.
3Device complexity
If the first power voltage is made constant to simplify the driving control, then the device complexity decreases, but the image quality at low luminance levels deteriorates
Solution Approach 1:
The patent changes the first power voltage from a constant parameter to a variable parameter that depends on the input luminance. The driving controller determines the first power voltage based on the display luminance, creating a luminance-dependent voltage adjustment mechanism. This resolves the contradiction by introducing variability in the first power voltage to maintain image quality at low luminance levels, while the determination process remains integrated within the existing driving controller without requiring separate complex control systems.
Data Source
AI summary
A display device includes a display panel including a pixel, a data driver which provides a data voltage to the pixel, a power voltage generator which provides a first initialization voltage and a first power voltage to the pixel, and a driving controller which controls the data driver and the power voltage generator, and the driving controller determines a difference between the first initialization voltage and the first power voltage based on an input luminance.