MVA Pixel Structure Feed-Through Voltage Compensation
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Solution Overview
Problem
Conventional LCDs using MVA technology suffer from color washout at large viewing angles due to differences in transmittance of liquid crystal molecules at varying feed voltages, limiting their competitiveness in the large-sized display panel market.
Innovation Solution
A pixel structure and drive method that generate two different feed-through voltages within a single pixel unit using existing gate and data lines, adjusting these voltages based on specific gate drive signals to prevent color washout, without adding additional lines, thus maintaining the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If MVA technology is used to increase viewing angle range and prevent gray scale inversion, then viewing angle and contrast ratio are improved, but color washout occurs at large viewing angles
Solution Approach 1:
The pixel electrode is divided into multiple regions (first pixel region and second pixel region) with different electrode patterns. Each region generates different feed-through voltages to compensate for color washout at different viewing angles, while maintaining the MVA structure for wide viewing angles and high contrast ratio.
Solution Approach 2:
Different regions of the pixel electrode are designed with different patterns (e.g., different aperture ratios or electrode shapes) to create spatially varying electrical characteristics. This local differentiation allows each region to produce appropriate feed-through voltage for its specific viewing angle range, preventing color washout while preserving overall display performance.
2Object-affected harmful factors
If additional gate lines or data lines are added to generate different feed-through voltages, then color washout can be prevented, but aperture ratio decreases
Solution Approach 1:
The existing gate lines and data lines are designed to serve multiple functions: they not only control the basic pixel operation but also generate different feed-through voltages for color washout compensation. The gate lines are configured to simultaneously enable pixel switching and create the voltage differentiation needed for multi-region control, eliminating the need for additional signal lines.
Solution Approach 2:
The functions of pixel control and feed-through voltage generation are merged into the existing gate line and data line structure. The electrode patterns are designed so that the same signal lines that control pixel switching also create the necessary voltage differences across different pixel regions, combining multiple functions into a single integrated system.
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
Successfully addresses color washout at large viewing angles while preserving the aperture ratio, enhancing the display's performance and competitiveness in the market.
Implementation Method 1
The first pixel area is operatively coupled to the first gate line via a first capacitance and a first thin film transistor (TFT), and is configured to generate a first feed through (FT) voltage
Data Source
AI summary
A display apparatus, pixel structure and drive method thereof are provided. The display apparatus comprises a gate drive chip, a first gate line, a second gate line, a first pixel unit, and a second pixel unit. The gate driver is configured to generate a first gate drive signal and a second gate drive signal. The first and second gate drive signals are outputted to the first and second gate lines, respectively. Furthermore, the first and second gate drive signals are configured to adjust a first feed through (FT) voltage generated by a first pixel area of the first pixel unit, a second FT voltage generated by a second pixel area of the first pixel unit, a third FT voltage generated by a third pixel area of the second pixel unit, and a fourth FT voltage generated by a fourth pixel area of the second pixel unit.