Display Apparatus Overdriving Region Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal displays (LCDs) face challenges in increasing response rates due to capacitive loads, leading to afterimage phenomena and limitations in high gray level performance, especially with transient voltage effects and maximum gray level constraints.
Innovation Solution
A display apparatus with a source driver and power supply system that expands the driving voltage range and adjusts grayscale voltages by setting a predetermined grayscale region and over driving region, allowing for increased voltage levels and maintaining gamma curves, thereby enhancing response rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If over driving is used to increase motion of liquid crystals by applying a voltage higher than a grayscale voltage level, then response rate is improved, but transient phenomenon increases and maximum gray level is limited
Solution Approach 1:
The patent segments the grayscale region into a predetermined grayscale region (0 to predetermined gray level-1) and an over driving region (predetermined gray level to maximum gray level). This segmentation allows different voltage handling strategies for different gray levels, applying over driving selectively where needed while maintaining stable operation in the predetermined region, thereby reducing transient phenomena while improving response rate.
Solution Approach 2:
The patent dynamically adjusts the driving voltage based on the gray level being displayed. By changing the voltage level according to the specific gray level (applying higher voltages in the over driving region and lower voltages in the predetermined region), the system optimizes response rate while minimizing transient effects that would occur with uniform high voltage application.
2Speed
If over driving voltage is applied to increase response rate at high gray levels, then motion of liquid crystals is improved, but afterimage phenomenon increases
Solution Approach 1:
The patent changes the voltage parameter dynamically based on the gray level. By applying higher voltages specifically in the over driving region (for gray levels from predetermined level to maximum level) while using lower voltages in the predetermined region, the system achieves improved response rate at high gray levels without causing excessive afterimage effects that would result from uniform high voltage application across all gray levels.
3Adaptability or versatility
If maximum voltage of source driver is increased to expand grayscale voltage range, then voltage range of over driving is expanded, but device complexity increases
Solution Approach 1:
The patent implements a dynamic voltage adjustment mechanism where the source driver's maximum voltage is increased only when needed for the over driving region. The controller dynamically determines when to apply higher voltages based on the gray level, allowing the system to expand voltage range adaptably without requiring permanent hardware modifications or complex circuit redesigns.
Data Source
AI summary
A display apparatus is provided. The display apparatus includes: a liquid crystal panel; a source driver configured to output a grayscale voltage to the liquid crystal panel; a power supply configured to provide a voltage to the source driver; and a controller configured to control the power supply and the source driver to change a maximum voltage provided to the source driver and a grayscale voltage based on conversion of a screen mode, and to set a predetermined grayscale region and an over driving region within an entire grayscale region.