Transflective Liquid Crystal Panel with Dual Common Electrodes
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Solution Overview
Problem
Liquid crystal display panels, particularly reflective types, face challenges in low power consumption and image visibility in dim ambient light, while transmissive types consume more power and are less effective outdoors.
Innovation Solution
A transflective liquid crystal display panel design incorporating both transmissive and reflective regions with a liquid crystal layer of equal thickness, featuring specific electrode configurations and polarizer arrangements to optimize electric field intensities and phase delays for enhanced light transmission and visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If a reflective liquid crystal display panel is used, then power consumption is reduced, but image visibility deteriorates in dim ambient light
Solution Approach 1:
The display panel is divided into multiple pixel units, each containing both transmissive and reflective regions. This segmentation allows different regions to serve different functions: transmissive regions for bright ambient light conditions and reflective regions for dim ambient light conditions, thereby resolving the contradiction between power consumption and image visibility.
Solution Approach 2:
Each pixel unit is designed with dual functionality, incorporating both transmissive and reflective regions. This multi-functionality enables the display panel to adapt to different ambient light conditions, maintaining both low power consumption and good image visibility across various lighting environments.
2Illumination intensity
If a transmissive liquid crystal display panel is used, then image visibility is improved in bright ambient light, but power consumption increases
Solution Approach 1:
The display panel segments each pixel unit into transmissive and reflective regions, allowing the system to leverage the advantages of both transmissive panels (good visibility in bright light) and reflective panels (low power consumption), thereby resolving the contradiction between image visibility and power consumption.
Solution Approach 2:
Different regions within each pixel unit are assigned different optical properties: transmissive regions with higher light transmission for bright ambient conditions and reflective regions with lower light transmission for dim ambient conditions. This local differentiation optimizes both power consumption and image visibility based on local lighting conditions.
3Adaptability or versatility
If a transflective liquid crystal display panel is used, then adaptability to different environments is improved, but device complexity increases
Solution Approach 1:
The panel structure is segmented into multiple pixel units with integrated transmissive and reflective regions, allowing environmental adaptability through a modular approach. This segmentation helps manage the complexity by breaking down the overall system into manageable, functionally distinct units.
Solution Approach 2:
The transmissive and reflective regions are merged within the same liquid crystal cell structure, sharing common electrodes and liquid crystal layers. This merging approach enables environmental adaptability while minimizing the increase in device complexity by avoiding separate, independent transmissive and reflective panels.
4Manufacturing precision
If the liquid crystal layer thickness is uniform across transmissive and reflective regions, then manufacturing precision is improved, but electric field intensity control becomes more difficult
Solution Approach 1:
While maintaining uniform liquid crystal layer thickness for manufacturing precision, the patent introduces different electrode configurations in transmissive versus reflective regions. This local differentiation in electrode structure allows for controlled variation in electric field intensity despite the uniform thickness, resolving the contradiction between manufacturing precision and electric field control.
Solution Approach 2:
The patent employs asymmetric electrode designs where the common electrode and pixel electrode arrangements differ between transmissive and reflective regions. This asymmetry in electrode configuration compensates for the uniform liquid crystal layer thickness, enabling proper electric field intensity control in both region types while maintaining manufacturing precision.
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 transflective design achieves improved image quality, low power consumption, and wide viewing angles, enabling effective display in both bright and dim environments, suitable for portable devices.
Implementation Method 1
a first electric field intensity between the second common electrode and the pixel electrode of the transmissive region is twice a second electric field intensity between the first common electrode and the pixel electrode of the reflective region
Implementation Method 2
a liquid crystal layer disposed between the first substrate and the second substrate
Implementation Method 3
the second substrate is provided with a reflective layer corresponding to the reflective region on the side facing the liquid crystal layer
Data Source
AI summary
A transflective liquid crystal display panel, a display device, an array substrate, a color filter substrate and a fabrication method thereof are provided. The transflective liquid crystal display panel comprises a first substrate (11), a second substrate (21) arranged opposite to the first substrate (11), and a liquid crystal layer (31) disposed between the first substrate (11) and the second substrate (21). The liquid crystal display panel comprises a plurality of pixel units, each pixel unit comprises a transmissive region and a reflective region, and a thickness (d1) of the liquid crystal layer (31) in the transmissive region is equal to a thickness (d2) of the liquid crystal layer (31) in the reflective region. On a side facing the liquid crystal layer (31), the first substrate (11) is provided with a first common electrode (12) corresponding to the reflective region and the transmissive region and a second common electrode (15) corresponding to the transmissive region. The second substrate (21) is provided with a pixel electrode (23) corresponding to the transmissive region and the reflective region on a side facing the liquid crystal layer (31), and the second substrate (21) is provided with a reflective layer (22) corresponding to the reflective region on the side facing the liquid crystal layer (31), and the reflective layer (22) is provided below the pixel electrode (23) of the reflective region. A first electric field intensity (E1) between the second common electrode (15) and the pixel electrode (23) of the transmissive region is twice a second electric field intensity (E2) between the first common electrode (12) and the pixel electrode (23) of the reflective region.