LCD Common Electrode Cutout for Gray Scale Accuracy
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Solution Overview
Problem
Liquid crystal displays in vertically aligned mode face challenges in accurately expressing gray scale values in low gray scale ranges due to increased side luminance and reduced overall luminance, which affects driving efficiency and aperture ratio.
Innovation Solution
The implementation of a liquid crystal display design featuring a first and second subpixel electrode with different voltage differences and magnitudes, along with a common electrode cutout, allows for controlled voltage application through reference voltage lines and switch circuits, ensuring accurate gray scale representation and improved lateral visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If two signal wires are used to input signals having opposite polarities, then side visibility is improved, but aperture ratio is reduced
Solution Approach 1:
The pixel electrode is divided into two subpixel electrodes (first and second subpixel electrodes) that can be independently controlled. This segmentation allows different voltage signals to be applied to adjacent regions, enabling improved side visibility through polarity differentiation while maintaining overall aperture ratio by using the same physical space more efficiently
Solution Approach 2:
Different voltage magnitudes and polarities are applied to different subpixel electrodes based on their local requirements. The first subpixel electrode receives a first voltage with a first magnitude and polarity, while the second subpixel electrode receives a second voltage with a second magnitude and polarity, optimizing local display characteristics for side visibility
2Ease of operation
If two signal wires overlap the pixel electrode, then signal input is enabled, but pixel voltage changes adversely affecting display performance
Solution Approach 1:
The signal wires are routed to overlap the common electrode cutout region rather than the pixel electrode area. By utilizing the vertical stacking and the cutout space, signals can be input without interfering with the pixel electrode voltage, thus maintaining display performance while enabling signal input
3Illumination intensity
If different voltages are applied to subpixels to increase side visibility, then luminance from side view increases, but accurate gray scale expression in low gray scale range becomes difficult
Solution Approach 1:
The patent applies different voltage parameters (magnitude and polarity) to different subpixel electrodes. The first subpixel electrode receives a first voltage with a first magnitude and polarity, while the second subpixel electrode receives a second voltage with a second magnitude and polarity. This parameter differentiation enables improved side visibility while maintaining accurate gray scale control through precise voltage management
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 design enhances the ability to express gray scale values in low gray scale ranges, reduces luminance deterioration, and maintains driving efficiency while minimizing aperture ratio degradation.
Implementation Method 1
The amount of light transmitted through the liquid crystal layer is controlled based on alignment of liquid crystal molecules in the liquid crystal layer. The alignment is controlled based on voltages applied to the field-generating electrodes.
Implementation Method 2
a liquid crystal layer between two substrates having field-generating electrodes, e.g., a pixel electrode and a common electrode. Voltages are applied to the field-generating electrodes to control alignment.
Data Source
AI summary
A liquid crystal display includes first and second substrates. The first substrate includes a gate line, data lines, a first reference voltage line, a second reference voltage line, a pixel electrode having a first subpixel electrode and a second subpixel electrode in a pixel area, and switch circuits connected to these lines and electrodes. The first and second reference voltage lines respectively apply a first and second reference voltages having different polarities. The second substrate includes a common electrode with a cutout. The first and second reference voltage lines include a first connector and a second connector parallel to the data line, and the first connector and the second connector overlap the cutout of the common electrode.