Display Device Driving Power Voltage Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices face image quality deterioration due to bright spots caused by low driving power voltage, which increases luminance corresponding to black grayscale, leading to reliability issues.
Innovation Solution
A display device and driving method that determine the driving power voltage by considering a bright spot, where a controller measures pixel current for each driving power voltage or black voltage, deciding a bright spot voltage and setting the final driving power voltage within a threshold range, using a quadratic equation to define reference currents and compare differences to prevent image quality deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the driving power voltage is decreased to low potential, then power consumption is reduced, but image quality deteriorates due to bright spot occurrence
Solution Approach 1:
The patent adjusts the black voltage parameter dynamically based on measured pixel currents to prevent bright spots while maintaining low driving power voltage. By changing the black voltage level according to actual panel characteristics, the system achieves both low power consumption and high image quality without bright spot defects.
Solution Approach 2:
The system measures pixel currents at different black voltage levels and uses this feedback information to determine the optimal black voltage that prevents bright spots. This closed-loop feedback mechanism ensures that the driving conditions are optimized based on actual panel performance, resolving the contradiction between power saving and image quality.
2Device complexity
If the driving power voltage is determined based only on luminance and chromaticity, then device complexity is reduced, but bright spots occur due to leakage current
Solution Approach 1:
The patent performs preliminary measurements of pixel currents at different black voltage levels before final operation. By pre-characterizing the panel's electrical properties and determining the optimal black voltage in advance, the system prevents bright spots without adding complexity to the normal operation mode.
Solution Approach 2:
The patent replaces complex hardware-based bright spot prevention mechanisms with an electrical measurement and control approach. By using current measurements and software-based voltage adjustment, the system achieves bright spot prevention without additional physical components, maintaining device simplicity while eliminating the harmful effect.
Data Source
AI summary
A display device includes: a display panel including a plurality of pixels; a data driver configured to supply a black voltage to the display panel; and a controller configured to: set an initial driving power voltage of the display panel; decide a bright spot voltage of the display panel while the data driver is supplying the black voltage to the display panel; and set any one of the bright spot voltage and the initial driving power voltage as a final driving power voltage.