Transflective LCD Slit Angles for Viewing Angle and Grayscale
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Solution Overview
Problem
Conventional transflective liquid crystal displays with dual cell gap structures face challenges in aligning liquid crystals evenly, leading to inferior electro-optical characteristics and narrow viewing angles, while those with single cell gap structures suffer from mismatched V-R and V-T curves, causing incorrect grayscales and productivity issues.
Innovation Solution
A fringe field switching mode transflective liquid crystal display with either a dual or single cell gap structure, where the cell gap of the transmissive area differs from that of the reflective area, featuring specific configurations such as varying inclination angles, slit widths, and slit intervals of pixel electrodes, and the use of λ/2 or λ/4 plates to adjust phase delays and match V-R and V-T curves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dual cell gap structure is used to match V-R and V-T curves, then electro-optical characteristics are improved, but liquid crystal alignment becomes uneven and viewing angles narrow
Solution Approach 1:
The patent applies different cell gap dimensions to different regions: the reflective area has a smaller cell gap (dr) while the transmissive area has a larger cell gap (dt). This local differentiation allows each region to be optimized independently - the reflective area achieves proper electro-optical characteristics with the smaller gap, while the transmissive area maintains adequate light transmission with the larger gap, thereby resolving the contradiction between electro-optical performance and viewing angle.
2Reliability
If a dual cell gap structure is used to match V-R and V-T curves, then electro-optical characteristics are improved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the display into distinct reflective and transmissive areas, each with its own optimized cell gap. The reflective area uses a smaller cell gap (dr) for proper electro-optical characteristics, while the transmissive area uses a larger cell gap (dt) for adequate light transmission. This segmentation allows independent optimization of each region without requiring complex overall redesign, thus improving electro-optical characteristics while managing manufacturing complexity.
3Ease of manufacture
If a single cell gap structure is used, then manufacturing is simplified, but V-R and V-T curves mismatch causing incorrect grayscales
Solution Approach 1:
The patent implements different cell gap dimensions for different functional regions: the reflective area has a smaller cell gap (dr) optimized for electro-optical characteristics, while the transmissive area has a larger cell gap (dt) optimized for light transmission. This local quality differentiation enables each region to achieve its optimal performance without compromising the other, thereby maintaining grayscale accuracy while managing manufacturing complexity through region-specific optimization.
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 enables high-quality image display with wide viewing angles and improved electro-optical characteristics, facilitating manufacturing by matching V-R and V-T curves and reducing the step difference between transmissive and reflective areas, thus enhancing productivity.
Implementation Method 1
a phase delay (Δn·d) of the reflective area is twice larger than that of the transmissive area
Implementation Method 2
fringe field switching mode transflective liquid crystal display
Implementation Method 3
reflective liquid crystal display uses natural light as a light source
Implementation Method 4
an upper polarizing plate aligned at an outer portion of the upper substrate; a lower polarizing plate aligned at an outer portion of the lower substrate
Data Source
AI summary
Disclosed is a fringe field switching mode transflective liquid crystal display capable of displaying high quality images. The transflective liquid crystal display includes a lower substrate having a counter electrode and a pixel electrode, an upper substrate aligned in opposition to the lower substrate by interposing a liquid crystal layer therebetween, an upper polarizing plate, a lower polarizing plate, a reflective plate provided at an inner portion of the lower substrate, a lower λ/2 plate, and an upper λ/2 plate. An inclination angle, a slit width and a slit interval of the pixel electrode of the reflective area are different from those of the pixel electrode of the transmissive area. The liquid crystal layer presents a phase delay of about 0 to λ/4 in the reflective area and presents a phase delay of about 0 to λ/2 in the transmissive area.