Display Panel Voltage Difference 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 without increasing black luminance, which affects visual performance.
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 image quality by preventing black luminance increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the first initialization voltage and first power voltage are kept constant, then the device operation is simple, but the image quality deteriorates at low luminance levels
Solution Approach 1:
The patent applies dynamics by making the voltage difference between the first initialization voltage and first power voltage variable rather than fixed. The driving controller dynamically adjusts this voltage difference based on the input luminance level, allowing the display device to optimize image quality at different luminance conditions while maintaining manageable operational complexity through automated control.
2Manufacturing precision
If the first power voltage is increased to maintain image quality at low luminance, then the black luminance increases adversely, but if it is kept constant, then image quality deteriorates
Solution Approach 1:
The patent applies parameter changes by specifically adjusting the voltage difference parameter between the first initialization voltage and first power voltage based on input luminance levels. Rather than changing absolute voltage levels that would affect black luminance, the patent modifies the relative voltage difference parameter to improve image quality at low luminance without increasing black luminance, thereby resolving the contradiction between image quality and black luminance control.
3Adaptability or versatility
If fixed voltage levels are used, then the circuit design is simple, but the display performance varies poorly across different luminance ranges
Solution Approach 1:
The patent applies feedback by having the driving controller continuously monitor the input luminance level and adjust the voltage difference between the first initialization voltage and first power voltage accordingly. This feedback mechanism enables the display device to adapt to different luminance ranges and maintain optimal display performance across varying conditions, while the automated control keeps the implementation complexity manageable.
Data Source
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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.