Transflective LCD Flicker Suppression via Asymmetric Pixel Electrode Design
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Solution Overview
Problem
Transflective liquid crystal display devices with a circular polarizer and a liquid crystal layer having a monodomain alignment experience flickers when viewed from an oblique direction during transmissive display, which affects display quality and is exacerbated by low-frequency driving.
Innovation Solution
The liquid crystal display device includes a pair of circular polarizers and a liquid crystal layer with monodomain alignment, where the pixel electrode has unit pixel electrodes with specific electrode side orientations and distances to the transmissive region, optimizing the alignment of liquid crystal domains to suppress flickers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a circular polarizer and liquid crystal layer with monodomain alignment are used in a transflective LCD, then display functionality in both reflection and transmission modes is achieved, but flickers occur when viewed from oblique directions during transmissive display
Solution Approach 1:
The patent applies asymmetry by creating an asymmetric configuration where the transmissive region is positioned at a specific distance from one electrode side (first electrode side) compared to the other electrode side (second electrode side). This asymmetric positioning of the transmissive region relative to the liquid crystal domain alignment creates different optical paths and interference patterns, thereby suppressing the flickers observed from oblique directions while maintaining display functionality in both reflection and transmission modes.
2Use of energy by moving object
If low-frequency driving is performed to reduce power consumption, then energy efficiency is improved, but flickers become more prominent and affect display quality
Solution Approach 1:
The patent implements preliminary anti-action by pre-positioning the transmissive region at a specific distance from the first electrode side before the low-frequency driving occurs. This preemptive structural configuration creates optical path differences that counteract the flicker generation mechanism, allowing the display to maintain stable image quality even when operated at low frequencies for reduced power consumption.
3Adaptability or versatility
If the transmissive region area is made smaller than the reflective region area, then transmission mode display capability is enhanced, but the overall pixel area is reduced affecting display coverage
Solution Approach 1:
The patent applies local quality by creating a non-uniform distribution of functional regions within the pixel. The transmissive region is strategically positioned at a specific location (closer to the first electrode side) with a specific area ratio, while the reflective region occupies the remaining area. This local differentiation optimizes the transmission mode display capability in the specific region where it is needed, while maintaining overall pixel area through the reflective region's larger coverage.
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 configuration improves the display quality by reducing flickers observed from oblique directions, even during low-frequency driving, by strategically positioning the transmissive region relative to the liquid crystal domain alignment.
Implementation Method 1
a liquid crystal layer having a monodomain alignment in which at least one liquid crystal domain of one type is formed in each of the plurality of pixels when a voltage is applied to the liquid crystal layer
Implementation Method 2
a pair of circular polarizers facing each other with at least the liquid crystal layer interposed therebetween
Implementation Method 3
each of the plurality of pixels includes at least one unit pixel that is a region corresponding to the at least one unit pixel electrode, and the unit pixel includes a reflective region performing display in a reflection mode
Implementation Method 4
a transmissive region performing display in a transmission mode and having an area smaller than an area of the reflective region
Data Source
AI summary
A pixel electrode of a liquid crystal display device includes at least one unit pixel electrode on which a liquid crystal domain is formed, and each pixel includes a unit pixel corresponding to the unit pixel electrode. The unit pixel includes a reflective region and a transmissive region smaller than the reflective region. An outer edge of the unit pixel electrode includes a first and a second electrode sides. The liquid crystal layer is a negative type, and a distance from the second electrode side to the transmissive region is smaller than a distance from the first electrode side to the transmissive region, or the liquid crystal layer is a positive type, and a distance from the first electrode side to the transmissive region is smaller than a distance from the second electrode side to the transmissive region.