LCD Common Voltage Generation via Data Voltage Averaging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal display (LCD) devices suffer from a flicker phenomenon due to variations in common voltage, which degrades picture quality, especially as the panel size increases, and requires manual adjustment of resistors for optimal performance.
Innovation Solution
An apparatus and method for driving an LCD device that includes a common voltage generating unit which calculates an average of data voltages from multiple data ICs to create a stable common voltage, eliminating the need for manual adjustment and improving picture quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a variable resistor is used to generate common voltage, then the common voltage can be adjusted manually, but the flicker phenomenon occurs and picture quality deteriorates
Solution Approach 1:
The system automatically generates the common voltage by averaging the data voltages from multiple data ICs, eliminating the need for manual adjustment. The common voltage generating unit continuously monitors and adjusts the common voltage based on the actual data voltages, making the system self-regulating and adaptive to changing display conditions.
Solution Approach 2:
The common voltage generating unit receives feedback from the data voltages generated by the data ICs and automatically adjusts the common voltage accordingly. By using the average of the data voltages as the basis for common voltage generation, the system creates a closed-loop control mechanism that prevents flicker and maintains picture quality stability.
2Area of stationary object
If the LCD panel size increases, then the display area is enlarged, but the flicker phenomenon becomes more serious
Solution Approach 1:
The patent combines multiple data voltages from different data ICs and averages them to generate the common voltage. This merging approach ensures that the common voltage represents the overall voltage level across the entire display panel, making the flicker control more effective for large panels where voltage variations can be more pronounced.
3Device complexity
If fixed resistors are used for common voltage generation, then the circuit is simple, but the common voltage cannot be optimized for different display conditions
Solution Approach 1:
The common voltage generating unit dynamically adjusts the common voltage based on the actual data voltages generated by the data ICs. Instead of using fixed resistors, the system calculates the average of the data voltages and uses this as the basis for common voltage generation, allowing the circuit to adapt to different display conditions, gray levels, and voltage requirements automatically.
Data Source
AI summary
An apparatus for driving a liquid crystal display device includes a liquid crystal display panel; a plurality of data ICs supplying data voltages to the liquid crystal display panel; a plurality of gate ICs supplying a gate signal to the liquid crystal display panel; and a common voltage generating unit that generates a common voltage to drive the liquid crystal display panel with a difference between the common voltage and the at least one of the data voltages, the common voltage depending on at least one of the data voltages.