Transflective LCD Panel Unequal Cell Gaps and Slit Electrodes
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Solution Overview
Problem
Transflective LCDs face challenges in achieving optimal performance in both bright and dark environments due to differences in cell gaps between transmissive and reflective areas, leading to suboptimal display quality and viewing angles.
Innovation Solution
A transflective LCD panel design with unequal cell gaps in transmissive and reflective areas, featuring a first substrate with a first overcoater and a second substrate with a pixel electrode and a common electrode with a slit structure, along with an insulating layer, to manage light effectively in both areas, enhancing contrast and viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a transflective LCD uses equal cell gaps in transmissive and reflective areas, then the structure is simple, but the display quality and viewing angles are suboptimal
Solution Approach 1:
The LCD panel is divided into two distinct regions with different cell gaps: a transmissive area with a first cell gap and a reflective area with a second cell gap. This segmentation allows each region to be optimized independently for its specific function, improving overall display quality while managing structural complexity through functional分区
Solution Approach 2:
Different cell gap dimensions are applied to different functional areas of the display. The transmissive area uses a first cell gap optimized for backlight transmission, while the reflective area uses a second cell gap optimized for ambient light reflection. This local differentiation ensures optimal display quality in each region without requiring the entire structure to be complex
2Manufacturing precision
If a transflective LCD uses unequal cell gaps in transmissive and reflective areas, then the display quality and viewing angles are improved, but the structure becomes more complex
Solution Approach 1:
The patent introduces a vertical dimension variation by implementing different cell gap thicknesses in different areas. This dimensional change allows optimization of light transmission and reflection properties without significantly increasing lateral structural complexity, thereby improving viewing angles while controlling overall device complexity
Solution Approach 2:
The design employs asymmetric cell gap configuration where the transmissive area has a different cell gap than the reflective area. This asymmetry is intentionally designed to match the different optical requirements of each region, improving display quality and viewing angles while accepting a moderate increase in structural complexity that is localized rather than universal
3Ease of manufacture
If common electrode patterns are used in both transmissive and reflective areas, then the manufacturing process is simple, but light leakage occurs and display performance is reduced
Solution Approach 1:
The electrode structure is segmented into different configurations for transmissive and reflective areas. The transmissive area uses a first common electrode pattern while the reflective area uses a second common electrode pattern with different characteristics. This segmentation enables precise control of light leakage in each region while maintaining manufacturing feasibility through standardized fabrication processes
Solution Approach 2:
Different electrode patterns are applied locally to different functional areas. The transmissive area receives a first common electrode pattern optimized for uniform field distribution, while the reflective area receives a second common electrode pattern optimized for preventing light leakage. This local customization achieves superior light leakage control without requiring complete redesign of the entire electrode 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
The design allows for simultaneous dark and bright state displays with improved contrast, wide viewing angles, high resolution, low power consumption, and reduced light leakage, addressing the limitations of existing transflective LCDs.
Implementation Method 1
a liquid crystal layer disposed between the first substrate and the second substrate
Implementation Method 2
pixel electrode and a second common electrode with a slit structure, along with an insulating layer, to manage light effectively
Implementation Method 3
cell gaps of the transmissive area and the reflective area are unequal to each other
Data Source
AI summary
A transflective liquid crystal display (LCD) panel, a display device and an array substrate are disclosed. The display panel includes a first substrate, a second substrate arranged opposite to the first substrate, and a liquid crystal layer disposed between the first substrate and the second substrate. The first substrate and the second substrate include a transmissive area and a reflective area, and the cell gaps of the transmissive area and the reflective area are unequal to each other. A portion of the first substrate corresponding to the reflective area is provided with a first over coater on a side surface close to the liquid crystal layer; a pixel electrode of an integrate structure is respectively disposed on a portion of the second substrate corresponding to the transmissive area and a portion of the second substrate corresponding to the reflective area; a portion of the second substrate corresponding to the transmissive area and on the pixel electrode is provided with a second common electrode with a slit structure, on a side surface close to the liquid crystal layer; and an insulating layer is disposed between the pixel electrode and the second common electrode. The transflective LCD panel can realize wide viewing angle and high contrast.