LCD Control Line Groups for Aperture Ratio and Visibility
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Solution Overview
Problem
Liquid-crystal display (LCD) devices face challenges in providing better visibility when viewed from the side and suffer from inverse afterimage phenomena, while also having a lower aperture ratio due to the requirement of contact holes for voltage division.
Innovation Solution
The implementation of a display panel with first and second sub-pixels, each connected to specific gate and data lines, and control lines, where the duty cycle of control signals ranges from 20% to 50%, allowing for different voltage applications to sub-pixels without additional contact holes, thereby improving visibility and aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If contact holes are added for voltage division to improve sub-pixel control, then visibility when viewed from the side is improved, but the aperture ratio decreases
Solution Approach 1:
The patent extracts the voltage division function from the traditional contact hole structure and relocates it to the gate driving unit. By removing the need for physical contact holes in the display panel, the aperture ratio is increased while the voltage division capability is preserved through the control line groups and duty cycle control mechanism.
Solution Approach 2:
The gate driving unit is given multiple functions: it not only drives the gate lines but also performs voltage division for sub-pixels through control line groups. This multi-functional approach eliminates the need for separate voltage division structures, thereby improving aperture ratio while maintaining side visibility.
2Reliability
If control lines are added for sub-pixel voltage control, then inverse afterimage is mitigated, but device complexity increases
Solution Approach 1:
The patent merges the control line structure into groups where multiple control lines share common connections to the gate driving unit. This consolidation reduces the overall complexity compared to fully independent control lines, while still enabling differential voltage control for inverse afterimage mitigation.
Solution Approach 2:
The gate driving unit applies control signals with different duty cycles to different control line groups, creating periodic voltage patterns that enable inverse afterimage mitigation. This time-based control approach reduces the need for additional physical structures.
3Reliability
If duty cycle control is implemented for control signals, then inverse afterimage is mitigated, but manufacturing precision requirements increase
Solution Approach 1:
The patent uses duty cycle as a controllable parameter to achieve inverse afterimage mitigation. By varying the duty cycle of control signals applied to different control line groups, the system can differential voltage control without requiring high-precision physical structure manufacturing, shifting the precision requirement to the electrical control domain.
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 enhances side visibility and increases the aperture ratio by eliminating the need for voltage division contact holes, while mitigating inverse afterimage effects by controlling the duty cycle of control signals.
Implementation Method 1
a gate driving unit configured to sequentially apply first to nth gate signals having a first pulse width to the first to nth gate lines, respectively, for a unit frame, where the first to kth control lines are sorted into first to kth control line groups... the gate driving unit is configured to sequentially apply first to kth control signals having a second pulse width to the first to kth control line group, respectively
Implementation Method 2
An LCD device displays an image in such a manner that a voltage is applied to field generating electrodes to generate an electric field across a liquid-crystal layer, and liquid-crystal molecules in the liquid-crystal layer are aligned by the electric field so as to control the polarization of incident light
Data Source
AI summary
A liquid-crystal display device includes a display panel connected to first to nth gate lines and first to nth control lines, where n is a natural number greater than one, and a gate driving unit which sequentially applies first to nth gate signals having a first pulse width to the first to nth gate lines, respectively, for a unit frame, where the first to nth control lines are sorted into first to kth control line groups, where k is a natural number greater than one and less than n, the gate driving unit sequentially applies first to kth control signals having a second pulse width to the first to kth control line group, respectively, for the unit frame, and the first pulse width is smaller than the second pulse width.