Transflective LCD Panel Without Phase Delay Sheet
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Solution Overview
Problem
Transflective liquid crystal display panels face challenges with complex structures and high energy consumption due to the need for λ/4 phase delay sheets, which increase thickness and reduce light transmission, and are unable to display images in dark environments without external light.
Innovation Solution
A transflective liquid crystal display panel with a simple structure is achieved by using twist nematic alignment for transmissive areas and hybrid alignment for reflective areas, eliminating the need for a λ/4 phase delay sheet, and incorporating polarizer sheets with parallel transmission axes for a normally black display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a λ/4 phase delay sheet is used in transflective liquid crystal display panels, then the display can achieve reflective and transmissive modes, but the structure becomes complex and the manufacturing process becomes complicated
Solution Approach 1:
The patent removes the λ/4 phase delay sheet from the display structure, extracting this component entirely. The reflective and transmissive display modes are achieved through alternative means: by using a reflective electrode pattern on the array substrate and controlling liquid crystal alignment (homogeneous alignment in transmissive areas, hybrid alignment in reflective areas), the display achieves dual-mode functionality without requiring the phase delay sheet, thus simplifying the overall structure.
Solution Approach 2:
The array substrate is designed with both transmissive electrode areas and reflective electrode areas on the same substrate. The liquid crystal layer is configured with different alignment modes in different regions to serve multiple functions: homogeneous alignment in transmissive areas enables backlight transmission, while hybrid alignment in reflective areas enables external light reflection. This multi-functional design eliminates the need for separate components for different display modes.
2Adaptability or versatility
If a λ/4 phase delay sheet is added to achieve transflective display, then reflective and transmissive modes are enabled, but the manufacturing process becomes more complex
Solution Approach 1:
The manufacturing process eliminates the step of adding a λ/4 phase delay sheet. Instead, the desired transflective functionality is achieved during the standard liquid crystal display manufacturing process by forming reflective electrode patterns on the array substrate and applying appropriate alignment layers (homogeneous alignment layer for transmissive areas, homeotropic alignment layer for reflective areas), thereby simplifying the manufacturing process while maintaining dual-mode capability.
Solution Approach 2:
The patent combines the functions of the phase delay sheet with the liquid crystal layer itself by configuring the liquid crystal molecules in different alignment modes in different regions. The liquid crystal layer simultaneously performs the functions of light modulation and mode selection (reflective vs. transmissive) through spatially varying alignment, merging multiple functions into a single component and eliminating the need for additional phase delay sheets in the manufacturing process.
3Adaptability or versatility
If a λ/4 phase delay sheet is used, then transflective display is achieved, but the panel thickness increases
Solution Approach 1:
The patent removes the λ/4 phase delay sheet from the panel structure, directly reducing the panel thickness. The transflective display capability is maintained through the reflective electrode pattern and differential liquid crystal alignment approach, achieving the same functional result with a thinner overall structure since no additional phase delay sheet layer is required.
4Adaptability or versatility
If a λ/4 phase delay sheet is incorporated, then reflective and transmissive modes are achieved, but light transmission is reduced
Solution Approach 1:
The patent removes the λ/4 phase delay sheet which was causing light transmission loss. The reflective and transmissive modes are achieved through the reflective electrode pattern and liquid crystal alignment control, eliminating the additional optical interface and material layer that caused energy loss, thereby improving light transmission efficiency while maintaining display mode flexibility.
Solution Approach 2:
The patent utilizes optical alignment and polarization control through liquid crystal molecular orientation (homogeneous vs. hybrid alignment) to achieve different optical states (transmissive vs. reflective) without adding physical layers that absorb or scatter light. By controlling the orientation of liquid crystal molecules and their interaction with polarized light, the system achieves mode switching with minimal light loss.
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
This solution reduces energy consumption, simplifies the manufacturing process, and enhances light transmittance, enabling effective image display in both bright and dark conditions without the complexity of phase delay sheets.
Implementation Method 1
Transmissive areas of the first substrate are provided with a first homogenous alignment layer, transmissive areas of the second substrate are provided with a second homogenous alignment layer, and the alignment direction of the first homogenous alignment layer and the alignment direction of the second homogenous alignment layer have a predetermined angle
Implementation Method 2
Reflective areas of the first substrate are provided with a third homogenous alignment layer and reflective areas of the second substrate are provided with a homeotropic alignment layer
Implementation Method 3
a liquid crystal layer between the first substrate and the second substrate. The first substrate and the second substrate include transmissive areas and reflective areas
Data Source
AI summary
A transflective liquid crystal display panel, a manufacturing method thereof and a display device are disclosed. The transflective liquid crystal display panel includes: a first substrate (1) and a second substrate (2) disposed oppositely and a liquid crystal layer (3) between the first substrate (1) and the second substrate (2). The first substrate (1) and the second substrate (2) include transmissive areas and reflective areas. Transmissive areas of the first substrate (1) are provided with a first homogenous alignment layer (11), transmissive areas of the second substrate (2) are provided with a second homogenous alignment layer (21), and the alignment direction of the first homogenous alignment layer (11) and the alignment direction of the second homogenous alignment layer (21) have a predetermined angle. Reflective areas of the first substrate (1) are provided with a third homogenous alignment layer (12) and reflective areas of the second substrate (2) are provided with a homeotropic alignment layer (22). This can realize a transflective liquid crystal display panel with simple structure.