Transflective Liquid Crystal Display With Wide-Angle Polarization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing transflective liquid crystal display devices suffer from poor viewing angle characteristics and high costs, particularly when used as in-cell type touch panels, and they lack adequate viewability in varying illuminance environments.
Innovation Solution
A transflective liquid crystal display device with a configuration that includes a first and second phase difference layer, each comprising λ/2 and λ/4 plates, and a positive C plate, with electrodes on one substrate, and a liquid crystal layer with positive dielectric anisotropy, allowing both reflective and transmissive regions, enhancing viewing angle characteristics and enabling in-cell touch functionality at low cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a transmissive liquid crystal display device is used, then brightness is sufficient in low illuminance environment, but viewability becomes insufficient in high illuminance environment such as outdoors under direct sunlight
Solution Approach 1:
The display surface is divided into multiple regions including a reflective region with reflective layer and a transmissive region without reflective layer, allowing different viewing performance in different lighting conditions. Each region can be optimized independently for its specific function
Solution Approach 2:
The liquid crystal display device is designed to perform both reflective display and transmissive display functions within the same device structure, enabling it to adapt to various lighting environments (both high and low illuminance conditions) without requiring separate devices
2Object-affected harmful factors
If a reflective liquid crystal display device is used, then viewability is good in high illuminance environment, but brightness becomes insufficient and viewability becomes poor in low illuminance environment such as indoors or at night
Solution Approach 1:
The display surface is segmented into reflective regions and transmissive regions, with the reflective region providing good viewability in bright environments and the transmissive region providing sufficient brightness in dark environments
Solution Approach 2:
The device combines both reflective and transmissive display capabilities, making it universally applicable to various lighting conditions including both high illuminance (outdoors) and low illuminance (indoors/night) environments
3Adaptability or versatility
If existing transflective liquid crystal display device configuration is used, then both reflective and transmissive regions are provided, but viewing angle characteristics become poor and cost increases
Solution Approach 1:
The patent optimizes parameters including liquid crystal layer thickness (2.0 to 4.0 μm), twist angle (40° to 80°), and alignment film characteristics to achieve wide viewing angles while maintaining the transflective display capability
Solution Approach 2:
The device uses composite optical film structures including phase difference layers with specific retardation values and alignment films with controlled surface properties to simultaneously achieve good viewing angle characteristics and maintain both reflective and transmissive display functions
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 device provides excellent viewing angle characteristics and serves as an in-cell type touch panel with improved viewability in any environment, while maintaining cost-effectiveness.
Implementation Method 1
a transverse electrical field mode in which a liquid crystal layer is driven by an electrical field in a direction substantially parallel to a substrate plane to perform display
Implementation Method 2
Each pixel has a reflective region for displaying by reflecting light and a transmissive region for displaying by transmitting light
Implementation Method 3
The first phase difference layer includes a first λ/2 plate and a first λ/4 plate. The second phase difference layer includes a second λ/2 plate and a second λ/4 plate
Data Source
AI summary
A transflective liquid crystal display device provided with a plurality of pixels, and includes: a first polarizer, a first phase difference layer, a first substrate, a liquid crystal layer, a second substrate, a second phase difference layer, and a second polarizer. The first substrate includes a reflective layer. The first phase difference layer includes a first λ/2 plate and a first λ/4 plate. The second phase difference layer includes a second λ/2 plate and a second λ/4 plate. At least one of the first phase difference layer and the second phase difference layer further includes a positive C plate. The liquid crystal layer takes a twist alignment when no voltage is applied. Each of the plurality of pixels includes a reflective region in which light is reflected by the reflective layer to perform display and a transmissive region in which light is transmitted to perform display.