LCD Branch Electrode Angles Reduce Flickering at Low Frequencies
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Solution Overview
Problem
Liquid crystal display (LCD) devices driven at low frequencies experience flickering due to differences in response speed between rising and falling pixel voltage polarity changes, which degrades display quality and is noticeable in low-frequency operations, leading to increased power consumption.
Innovation Solution
The LCD device incorporates a first electrode with branch electrodes angled between 9° to 30° relative to the normal line, connected by a parallel connecting electrode, and a thin film transistor, operating at a gate control signal frequency of 15 Hz to 30 Hz, to stabilize luminance and reduce flickering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the LCD device is driven at low frequency to reduce power consumption, then power consumption is reduced, but flickering occurs due to response speed differences between rising and falling pixel voltage polarity changes
Solution Approach 1:
The first electrode is divided into multiple first branch electrodes that are angled relative to the gate line direction. This segmentation creates multiple electric field directions that work together to improve the response characteristics of liquid crystal molecules, reducing the difference between rising and falling response speeds and thereby reducing flickering at low driving frequencies
Solution Approach 2:
The first branch electrodes are configured with specific angles (9° to 30°) relative to the gate line to create localized electric field orientations that optimize liquid crystal molecule alignment. This local optimization of electric field direction improves response characteristics in specific regions, reducing overall flickering while maintaining low power consumption operation
2Ease of manufacture
If the first electrode uses a simple planar structure, then manufacturing is easier, but response speed difference between rising and falling polarity changes causes flickering
Solution Approach 1:
The first electrode is segmented into multiple first branch electrodes with specific angular orientations. This segmentation approach maintains relative manufacturing simplicity while significantly improving response characteristics by creating optimized electric field distributions that reduce flickering
Solution Approach 2:
The first branch electrodes are arranged asymmetrically at angles of 9° to 30° relative to the gate line direction rather than being symmetrically aligned. This asymmetric configuration optimizes the electric field distribution to reduce the response speed difference between rising and falling polarity changes, thereby reducing flickering
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 reduces flickering and stabilizes gray-scale display, allowing the LCD device to operate with relatively low power consumption while maintaining improved viewing angles and transmittance.
Implementation Method 1
Upon applying voltage to the two electrodes, liquid crystal molecules of the liquid crystal layer are rearranged such that an amount of transmitted light is controlled in the LCD device
Implementation Method 2
The liquid crystal layer may include liquid crystal molecules having positive dielectric anisotropy
Implementation Method 3
a first electrode includes a plurality of first branch electrodes having an angle of about 9 degrees to about 30 degrees with respect to a normal line which is orthogonal to the gate line
Data Source
AI summary
A liquid crystal display (“LCD”) device is capable of consuming relatively less power and significantly reducing flickering that may occur when the LCD device is driven by low frequency, the LCD device including: a liquid crystal layer disposed between the first substrate and the second substrate; a gate line; a data line intersecting the gate line; a timing controller outputting a gate control signal by a frequency of about 15 hertz (Hz) to about 30 Hz; a first electrode on the first substrate; and a second electrode on the first substrate, the second electrode spaced apart from the first electrode. The first electrode includes a plurality of first branch electrodes having an angle of about 9 degrees to about 30 degrees with respect to a normal line which is orthogonal to the gate line.