LCD Pixel Segmentation for Oblique Viewing Angle Control
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Solution Overview
Problem
Current viewing-angle image control (VIC) type LCD devices cannot effectively restrict both black and white images, as well as color images, along an oblique direction in a narrow viewing angle mode, limiting their ability to adjust viewing angles for color images.
Innovation Solution
The LCD device is designed with first and second substrates and a liquid crystal layer, featuring specific pixel regions driven by horizontal and vertical electric fields, allowing for in-plane switching (IPS) and electrically controlled birefringence (ECB) modes, respectively, to control light transmittance and viewing angles, enabling effective restriction of images along an oblique direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a VIC type LCD device uses a conventional structure with limited pixel regions, then the device complexity is reduced, but the ability to effectively restrict both black-and-white and color images along an oblique direction is insufficient
Solution Approach 1:
The display region is divided into six distinct pixel regions (first through sixth pixel regions) arranged in a 2×3 matrix, with different viewing angle characteristics. Each region can be independently controlled to display images with different viewing angle properties, enabling versatile viewing angle control while maintaining manageable device complexity through systematic segmentation.
Solution Approach 2:
Different pixel regions are assigned different local qualities: the first, second, and third pixel regions display images with a first viewing angle, while the fourth, fifth, and sixth pixel regions display images with a second viewing angle. This local differentiation allows the device to effectively restrict both black-and-white and color images along oblique directions in specific regions while maintaining overall functionality.
2Illumination intensity
If the LCD device displays full color images in all pixel regions, then the color image display quality is improved, but the ability to restrict images along an oblique direction for privacy protection is reduced
Solution Approach 1:
The device applies different local qualities to different pixel regions: the first, second, and third pixel regions are configured to restrict image display along oblique directions, while the fourth, fifth, and sixth pixel regions maintain full color image display capability. This allows the device to protect privacy in specific regions while preserving color image quality in other regions.
Solution Approach 2:
The device dynamically controls the viewing angle characteristics of different pixel regions based on the type of image being displayed. By selectively adjusting the viewing angle properties of the first through sixth pixel regions, the device can switch between privacy protection mode and full color display mode, adapting to different usage scenarios.
3Object-affected harmful factors
If the LCD device uses a narrow viewing angle mode for black-and-white images, then the restriction of black-and-white images along an oblique direction is improved, but the control over color image viewing angles is limited
Solution Approach 1:
The device segments the display into six pixel regions with different viewing angle characteristics, allowing independent control of black-and-white and color image display. The first, second, and third pixel regions can be optimized for black-and-white image restriction, while the fourth, fifth, and sixth pixel regions can be optimized for color image display, providing both narrow viewing angle mode for privacy and wide viewing angle mode for color images.
Solution Approach 2:
Each pixel region is designed with multi-functionality to support both black-and-white and color image display with different viewing angle characteristics. The device can selectively activate different viewing angle modes in different regions, making the system universally applicable to both privacy protection scenarios and full-color display scenarios.
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 allows for effective restriction of both black and white images along an oblique direction in a narrow viewing angle mode, while maintaining full color image display, thereby enhancing user privacy and improving display quality by ensuring only a white image is visible from the oblique direction.
Implementation Method 1
There are electrodes formed on the two substrates, to which a voltage is applied to generate an electric field, thereby re-aligning liquid crystal molecules in the liquid crystal layer
Implementation Method 2
re-aligning liquid crystal molecules in the liquid crystal layer. Thus, according to re-alignment of the liquid crystal molecules, the LCD device changes light transmittance
Implementation Method 3
a first voltage to the first pixel electrode to generate a horizontal electric field between the first pixel electrode and the first common electrode
Implementation Method 4
a second voltage to the second pixel electrode to generate a vertical electric field between the second pixel electrode and the second common electrode
Implementation Method 5
a color filter layer on the black matrix, the color filter layer including red, green and blue color filters
Data Source
AI summary
A liquid crystal display device includes first and second substrates, a liquid crystal layer disposed therebetween, first and second gate lines on the first substrate, first, second and third data lines crossing the first and second gate lines to define first, second, third, fourth, fifth and sixth pixel regions, a first pixel electrode and a first common electrode in each of the first, second and third pixel regions, the first pixel electrode connected to a thin film transistor and the first common electrode spaced apart from the first pixel electrode, a second pixel electrode in each of the fourth, fifth and sixth pixel regions, the second pixel electrode connected to the thin film transistor and having a plate shape, a color filter layer including a red color filter corresponding to each of the first and fourth pixel regions, a green color filter corresponding to each of the second and fifth pixel regions, a blue color filter corresponding to each of the third and sixth pixel regions, a second common electrode on the color filter layer in each of the fourth, fifth and sixth pixel regions.