Gate Driver Voltage Adaptation for LCD Common Voltage Swing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Large-sized liquid crystal display devices experience poor display quality due to image signal distortion caused by the common voltage swing, leading to differences in charge quantities and voltage differences between the image signal and common voltage.
Innovation Solution
A device and method for driving liquid crystal display devices, where the level of the gate driving voltage varies in accordance with the swinging level of the common voltage, utilizing a liquid crystal panel, data driver, gate driver, driving voltage generating unit, and timing controller to generate a common voltage that swings every frame, ensuring the gate driving voltage adapts to the common voltage level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the level of the common voltage is made to swing in accordance with a polarity of the image signal to increase response speed and save power consumption, then the response speed of liquid crystals is increased and power consumption is reduced, but image signal distortion occurs resulting in poor display quality
Solution Approach 1:
The gate driving voltage level is dynamically adjusted in accordance with the swinging level of the common voltage. Instead of using a fixed gate driving voltage, the system varies the gate driving voltage level to match the common voltage swing, thereby maintaining a stable voltage difference and preventing image signal distortion while preserving the benefits of common voltage swinging.
Solution Approach 2:
The invention changes the parameter of gate driving voltage level to adapt to the common voltage swing. By varying the gate driving voltage level in response to common voltage changes, the system maintains optimal operating conditions across different common voltage levels, preventing distortion and improving display quality.
2Use of energy by stationary object
If the level of the common voltage is configured to swing such that polarity and magnitude of the image signal are opposite to that of the common voltage to increase the difference between levels, then power consumption is reduced, but charge time difference between upper side and lower side of large sized liquid crystal panel increases causing image distortion
Solution Approach 1:
The gate driving voltage level is dynamically adjusted according to the common voltage swing level. This dynamic adjustment compensates for the charge time differences between different regions of large-sized liquid crystal panels, ensuring uniform charging across the entire panel while maintaining the power-saving benefits of common voltage swinging.
Solution Approach 2:
The invention applies different gate driving voltage levels to different regions of the liquid crystal panel according to their specific charging characteristics. By locally adapting the gate driving voltage to compensate for position-dependent charge time differences, the system achieves uniform image signal charging across the entire panel.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach prevents image signal distortion, improves display quality, and reduces power consumption by maintaining a stable differential voltage between the image signal and common voltage, enhancing brightness and reducing heat generation.
Implementation Method 1
The liquid crystal display device displays pictures by controlling light transmissivity of liquid crystals using an electric field
Implementation Method 2
the pixel cells receive an image signal from the data lines in response to a gate driving voltage received through the gate lines and vary an array of the liquid crystal molecules therein to control light transmissivity
Data Source
AI summary
A device for driving a liquid crystal display device includes a liquid crystal panel having a plurality pixel regions formed thereon, a data driver to drive data lines on the liquid crystal panel, a gate driver to drive gate lines on the liquid crystal panel, a driving voltage generating unit to generate a common voltage wherein a level of the common voltage swings every frame, and a timing controller to control the driving voltage generating unit and the gate driver to generate a gate driving voltage wherein a level of the gate driving voltage varies in accordance with the common voltage swinging level.