LCD Common Voltage Circuit Reducing Flicker via Segmented Sub-Circuits
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Solution Overview
Problem
Current liquid crystal display (LCD) modules experience flicker due to asymmetry in positive-polarity and negative-polarity voltages, leading to inconsistent display quality across different areas, as a single common voltage cannot guarantee low flicker across the entire screen.
Innovation Solution
A common voltage generating circuit with multiple sub-circuits that calculate and adjust the average voltage between adjacent data lines at the gap time between frames, ensuring consistent common voltage across the liquid crystal unit, thereby reducing flicker and improving display performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single common voltage is applied to the liquid crystal display, then the circuit structure is simple, but the flicker cannot be reduced uniformly across different areas of the display
Solution Approach 1:
The patent divides the display panel into multiple regions, with each region having its own common voltage generating sub-circuit. This segmentation allows different areas to have independently optimized common voltages, reducing flicker uniformly across the entire display while maintaining reasonable circuit complexity through modular design.
2Reliability
If the common voltage is adjusted for each frame, then the flicker reduction effect is improved, but the calculation and adjustment time required increases
Solution Approach 1:
The patent calculates and determines the common voltage value during the gap time between adjacent frames, before the next frame's display begins. This preliminary action ensures that the common voltage is ready and optimized for each frame without causing display delays or extending the actual display time, thus maintaining high refresh rates while achieving frame-by-frame flicker reduction.
3Reliability
If multiple common voltage generating sub-circuits are used, then the flicker reduction across the entire display is improved, but the circuit complexity increases
Solution Approach 1:
The display panel is divided into multiple regions, each with its own common voltage generating sub-circuit. This segmentation allows different areas to have independently optimized common voltages, reducing flicker uniformly across the entire display while maintaining reasonable circuit complexity through modular design.
Solution Approach 2:
Each common voltage generating sub-circuit is configured to serve a specific region of the display panel. The sub-circuits may have different configurations or parameters optimized for their respective regions, allowing local optimization of flicker reduction while maintaining overall system functionality.
Data Source
AI summary
A common voltage generating circuit is applied to a liquid crystal display circuit and includes M common voltage generating sub-circuits. The liquid crystal display circuit includes a data-driving chip, a row-driving chip, a thin film transistor (TFT) array, and a liquid crystal unit array corresponding to the TFT array. The row-driving chip is used to for opening the TFT array row-by-row through scanning lines. The data-driving chip is used for charging one row of the liquid crystal unit corresponding one row of TFT through data lines. N input terminals of a first common voltage generating sub-circuit respectively connect with adjacent N data lines output from the data-driving chip, an output terminal of the first common voltage generating sub-circuit connects with a common terminal of the liquid crystal unit corresponding to the N data lines, N is an even number.