Pixel Electrode Structure for LCD Color Shift Reduction
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Solution Overview
Problem
Conventional LCD pixel structures suffer from color shift and reduced brightness due to the fixed tilting angle of liquid crystal molecules, leading to uneven light emission and contrast issues when viewed from different angles.
Innovation Solution
A pixel structure with a first pixel electrode coupled to a lower voltage and a second pixel electrode coupled to a higher voltage, separated by a slit, and featuring protrusions to stabilize voltage and tilt liquid crystals uniformly, maintaining a 2:1 area ratio to enhance contrast and aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional MVA pixel structure with fixed tilting angle is used, then the device structure is simple, but color shift occurs and viewing angle is limited
Solution Approach 1:
The pixel electrode is divided into multiple domains (first pixel electrode and second pixel electrode) with different tilting angles. Each domain is independently controlled by separate voltage signals, allowing the liquid crystal molecules in different regions to tilt at different angles. This segmentation enables the display to maintain performance across multiple viewing angles while keeping the overall structure relatively simple.
2Adaptability or versatility
If multiple pixel electrodes with different voltages are used to reduce color shift, then color shift is reduced, but the aperture ratio decreases and brightness is reduced
Solution Approach 1:
The first pixel electrode is positioned within the region bounded by the second pixel electrode, creating a nested configuration. This allows both electrode types to coexist within the same pixel area without excessive spacing, maximizing the use of available space for light transmission while maintaining the multi-domain structure needed for color shift reduction.
Solution Approach 2:
Different regions of the pixel electrode are assigned different tilting angles and voltage controls. The first pixel electrode region has one tilting angle optimized for certain viewing conditions, while the second pixel electrode region has another tilting angle optimized for different viewing conditions. This local differentiation allows the display to maintain high brightness in each region while collectively achieving broad viewing angle performance.
3Stability of the object's composition
If protrusions are added to stabilize voltage and tilt liquid crystals uniformly, then liquid crystal alignment is improved, but the device complexity increases
Solution Approach 1:
Protrusions are formed on the substrate before the liquid crystal layer is applied. These protrusions pre-establish the desired tilt orientation for the liquid crystal molecules, guiding their alignment as the liquid crystal is injected. This preliminary structural preparation ensures uniform tilting without requiring complex external alignment mechanisms or multiple processing steps.
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
The solution effectively reduces color shift, enhances brightness, and widens the view angle by uniformly tilting liquid crystals and increasing the aperture ratio, while maintaining original contrast and low color shift characteristics.
Implementation Method 1
The voltage differential between the pixel electrodes 4a and 4b results in liquid crystal molecules to tilt with different angles. The transmittance of the light differs at various view angles (a contained angle with the normal line of the panel), changing the mixing proportion of the light passing through the color filter.
Data Source
AI summary
A pixel structure includes a first pixel electrode and a second pixel electrode. The second pixel electrode is configured around the first pixel electrode. The first pixel electrode is coupled to a first voltage and the second pixel electrode is coupled to a second voltage. The second voltage is higher than the first voltage. The area of the first pixel electrode is larger than that of the second pixel electrode.