Liquid Crystal Panel Grey Level Adaptive Voltage Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional liquid crystal panels experience a feed-through voltage (ΔV) issue due to the difference between turn-on and turn-off voltages, leading to flicker phenomena and unbalanced common voltage, which degrades displaying performance, especially at varying grey levels.
Innovation Solution
A liquid crystal panel with an image inspection section that classifies images by grey level and adjusts chamfer and gamma voltages using multiple circuits to reduce the difference between turn-on and turn-off voltages, thereby minimizing feed-through voltage ΔV across all grey levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a fixed chamfer voltage is supplied to reduce the difference between turn-on voltage Vgh and turn-off voltage Vgl, then the feed-through voltage ΔV is reduced, but the difference of ΔV between high and low grey levels increases, leading to unbalanced common voltage Vcom and degraded displaying performance
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed chamfer voltage to a variable chamfer voltage that changes according to the grey level of the image signal. The chamfer voltage control section dynamically adjusts the chamfer voltage based on the current grey level, ensuring that the difference between Vgh and Vgl is optimized for each specific grey level, thereby reducing feed-through voltage while maintaining balanced common voltage across all grey levels.
Solution Approach 2:
The patent implements parameter changes by modifying the chamfer voltage parameter according to the grey level parameter of the image signal. Different chamfer voltage values are applied for different grey levels, allowing the system to adaptively control the feed-through voltage ΔV for each grey level and maintain reliable displaying performance across the entire grey level range.
2Object-affected harmful factors
If the difference between turn-on voltage Vgh and turn-off voltage Vgl is decreased to reduce feed-through voltage ΔV, then flicker phenomenon is reduced, but the common voltage Vcom becomes unbalanced at different grey levels
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the chamfer voltage parameter based on the grey level parameter. This allows the system to optimize the difference between Vgh and Vgl for each grey level, effectively reducing flicker phenomenon while simultaneously maintaining balanced common voltage Vcom across all grey levels through adaptive parameter control.
Solution Approach 2:
The patent implements feedback by using the grey level information as feedback to control the chamfer voltage. The system continuously monitors the current grey level and adjusts the chamfer voltage accordingly, creating a closed-loop control system that ensures both flicker reduction and common voltage balance are maintained across different display conditions.
Data Source
AI summary
The present invention discloses a liquid crystal panel. The panel includes a display area that includes an array of pixel units formed thereon, a source controller, a gamma voltage control section, a gate controller, a chamfer voltage control section, and an image inspection section. The image inspection section classifies images into n classes according to ranking of grey level. The chamfer voltage control section is operated in response to the class of an image to control one of the n chamfer voltage circuits to supply the chamfer voltage to the gate controller and the gamma voltage control section is operated in responses to the class of the image to control one of the n gamma voltage circuits to supply the gamma voltage to the source controller, where n is an integer greater than 1. The present invention also discloses a driving method for the liquid crystal panel and a liquid crystal display including the liquid crystal panel. The liquid crystal panel provided by the present invention allows for reduction of a feed-through voltage ΔV and at the same time reducing the difference of ΔV between high and low grey levels so as to enhance the displaying quality of the liquid crystal panel.