Liquid Crystal Display Flicker Reduction via Pixel Pair Polarity Control
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Solution Overview
Problem
Liquid crystal display devices of the transverse electric field mode with pseudo dual-domain configurations experience flicker issues due to varying electrode structures between adjacent pixels, particularly when using column-inversion driving schemes, which affect viewing angle characteristics and visibility.
Innovation Solution
A liquid crystal display device with a matrix pattern of pixels, where pairs of adjacent pixels with different electrode structures receive voltages of the same polarity, and other pairs receive voltages of different polarities, reducing flicker by applying voltages of the same polarity to two adjacent pixels and alternating polarities between pixel pairs, thereby improving viewing angle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If pseudo dual-domain configuration is used to improve viewing angle characteristics, then viewing angle characteristics are improved, but flicker occurs due to varying electrode structures between adjacent pixels
Solution Approach 1:
The patent applies different electrode structures (different domains) to different regions (pixels) of the display. Specifically, odd-numbered pixels have one electrode structure while even-numbered pixels have another, creating local variations that form different liquid crystal domains. This local quality differentiation improves viewing angle characteristics while the patent simultaneously controls flicker through synchronized voltage application to adjacent pixels with different structures.
2Use of energy by stationary object
If column-inversion driving scheme is used to reduce power consumption, then power consumption is reduced, but flicker is exacerbated due to polarity alternation between adjacent pixels
Solution Approach 1:
The patent segments the pixel array into odd-numbered and even-numbered pixel groups. By applying the same voltage polarity simultaneously to adjacent pixels within the same group (whether odd or even), the patent creates synchronized operation within segments while allowing polarity alternation between segments. This segmentation approach maintains the power-saving benefits of inversion driving while eliminating flicker caused by unsynchronized polarity changes.
Solution Approach 2:
The patent implements a periodic voltage application scheme where the polarity is inverted every frame for each pixel group. Odd-numbered pixels and even-numbered pixels each follow a periodic inversion pattern, but their inversion timing is coordinated so that adjacent pixels with different electrode structures receive voltage simultaneously. This periodic action with coordinated timing reduces power consumption through inversion while preventing flicker through synchronized application.
3Stability of the object's composition
If different electrode structures are provided in adjacent pixels to form dual domains, then liquid crystal domains with opposite rotation directions are formed, but rapid luminance changes occur causing flicker
Solution Approach 1:
The patent creates equipotential conditions for adjacent pixels with different electrode structures by applying the same voltage polarity simultaneously to these pixels. Although the pixels have different electrode structures that create different liquid crystal domains, the simultaneous voltage application ensures that both pixels reach their operational state at the same time, eliminating potential differences in activation timing that would cause rapid luminance changes and flicker.
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 solution significantly reduces flicker and enhances viewing angle characteristics by stabilizing voltage application across pairs of pixels, minimizing rapid luminance changes and power consumption, especially at lower drive frequencies.
Implementation Method 1
an electric field is generated in an in-plane direction (or an oblique direction) by using the pixel electrode and the common electrode provided on one substrate so as to rotate liquid crystal molecules in a direction parallel to the substrate
Implementation Method 2
liquid crystal molecules of different sub-pixel regions rotate in opposite directions in the presence of an applied voltage
Implementation Method 3
an alignment film is provided on each of a pair of substrates, and the alignment film is subjected to rubbing treatment so as to define an initial alignment direction of liquid crystal molecules
Data Source
AI summary
A liquid crystal display device includes a plurality of pixels arranged in a matrix pattern, each pixel including a first electrode and a second electrode for generating a transverse electric field, wherein: in a first group of pixels arranged in a line along either a row direction or a column direction, pairs of pixels are arranged repeatedly, each pair of pixels including two adjacent pixels that are different from each other in terms of an electrode structure of at least one of the first electrode and the second electrode; and voltages of the same polarity are applied to the two adjacent pixels included in the pair of pixels, and voltages of different polarities from each other are applied to two pixel pairs adjacent to each other in the first group of pixels.