LCD Viewing Angle Control Subpixel for Privacy and Brightness
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Solution Overview
Problem
Conventional LCD devices offer wide viewing angles, which can compromise privacy by allowing image leakage, and lack the ability to selectively control viewing angles and improve image brightness.
Innovation Solution
The implementation of a liquid crystal display device with subpixels using vertical alignment mode negative liquid crystals, where a viewing angle controlling subpixel is driven by voltages applied to a side electrode and a common electrode, allowing for selective control of light transmission to achieve wide or narrow viewing angles and enhanced brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wide viewing angle mode is provided to allow image viewing from various directions, then viewing angle flexibility is improved, but privacy is compromised due to image leakage
Solution Approach 1:
The patent implements a viewing angle control layer that can dynamically change its optical properties between different states. By applying different voltages to the viewing angle control electrodes, the liquid crystal molecules in this layer reorient themselves, switching between a state that allows wide viewing angles and a state that restricts viewing to a narrow angle, thereby providing dynamic adaptability while maintaining privacy when needed
Solution Approach 2:
The display device is divided into functionally independent layers: a display layer for image generation and a separate viewing angle control layer for managing light transmission angles. This segmentation allows the viewing angle control layer to operate independently, controlling the viewing characteristics without affecting the display quality, and enables selective activation of wide or narrow viewing angle modes
2Object-affected harmful factors
If the viewing angle is restricted to a specific angle for privacy, then privacy is improved, but viewing angle flexibility deteriorates
Solution Approach 1:
The viewing angle control layer uses voltage-controlled liquid crystal reorientation to dynamically switch between privacy-protecting narrow angle mode and flexible wide angle mode. When privacy is required, voltage is applied to orient the liquid crystal molecules to restrict viewing; when flexibility is needed, voltage is adjusted to allow broader viewing angles
3Ease of manufacture
If conventional LCD structure is used, then manufacturing simplicity is maintained, but image brightness is insufficient
Solution Approach 1:
The patent combines the display layer with an integrated viewing angle control layer that also functions to enhance brightness. The viewing angle control layer includes transparent electrodes and liquid crystal materials that, when properly configured, not only control viewing angles but also improve light transmission efficiency and brightness without requiring separate brightness enhancement components
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 solution enables the LCD device to selectively control viewing angles and improve image brightness, reducing privacy concerns while maintaining manufacturing efficiency and cost-effectiveness by integrating viewing angle control within the existing structure.
Implementation Method 1
Liquid crystals (LCs) have dielectric anisotropy and refractive index anisotropy. The arrangement of molecules of the LCs varies according to an electric field applied thereto with the polarization of light changing according to the arrangement.
Implementation Method 2
Liquid crystals (LCs) have dielectric anisotropy and refractive index anisotropy. The arrangement of molecules of the LCs varies according to an electric field applied thereto with the polarization of light changing according to the arrangement.
Implementation Method 3
a liquid crystal layer of a vertical alignment mode using negative liquid crystals... delaying a phase of the light from the data displaying subpixels when a voltage having a voltage difference from the common voltage applied to the common electrode is applied to the side electrode
Data Source
AI summary
A liquid crystal display device includes pixels having a plurality of subpixels. The pixels include data displaying subpixels having a first pixel electrode receiving red, green, and blue data voltages to display an image, and a common electrode to which a common voltage is applied. The pixels further a viewing angle controlling subpixel driven in response to a voltage applied to the common electrode, a side electrode separated from the common electrode, and a second pixel electrode. Each of the subpixels includes a rib distorting an electric field applied to the corresponding liquid crystal layer. The viewing angle controlling subpixel delays a phase of the light from the data displaying subpixels when a voltage having a voltage difference from the common voltage is applied to the side electrode during a narrow viewing angle mode of the liquid crystal display device.