Dual View Display Apparatus with Oriented Liquid Crystal Molecules
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Solution Overview
Problem
Conventional display apparatuses face challenges in effectively separating images displayed in different directions, leading to crosstalk and reduced visibility due to scattered/diffracted light, especially when displaying black images for one direction while showing images for another, such as in in-vehicle displays where a driver's seat requires a non-display mode.
Innovation Solution
The display apparatus employs a liquid crystal layer sandwiched between opposing substrates with oriented liquid crystal molecules and a light shielding element, where the orientation of liquid crystal molecules is aligned to be parallel or substantially parallel to the viewing angle direction, reducing crosstalk by ensuring light is emitted primarily in the intended display direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a barrier light shielding layer is used to separate images for different viewing directions, then image separation capability is improved, but scattered/diffracted light still causes crosstalk and reduces visibility
Solution Approach 1:
The barrier light shielding layer is divided into multiple independent light shielding elements arranged in specific patterns. Each element corresponds to specific pixel lines and blocks light in particular directions. This segmentation allows precise control of light paths for different viewing directions, improving image separation while reducing crosstalk from scattered and diffracted light.
Solution Approach 2:
Different regions of the barrier light shielding layer have different light blocking characteristics tailored to local requirements. The light shielding elements are strategically positioned and sized to block light from specific pixel lines in specific directions. This local optimization ensures that each region contributes to the overall image separation performance while minimizing crosstalk in its designated area.
2Adaptability or versatility
If different images are displayed for driver and passenger seats simultaneously, then dual view functionality is achieved, but visibility and safety are reduced when driver's seat should be non-display mode
Solution Approach 1:
The display apparatus dynamically switches between different display modes (dual view mode and single view mode) based on operational conditions. In driver's non-display mode, the system activates light shielding elements to block light from pixel lines that would otherwise be visible from the driver's seat. This dynamic adaptation ensures that the display automatically adjusts to provide optimal visibility and safety for different usage 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 enhances image separation capability and display quality by preventing light leakage into unintended directions, improving visibility and reducing crosstalk, especially in scenarios like in-vehicle displays where one direction is set to non-display.
Implementation Method 1
an orientation member arranged to orient liquid crystal molecules constituting the liquid crystal layer; and an electrode arranged to apply electric fields corresponding to images, which are displayed by the pixels, to areas of the liquid crystal layer
Implementation Method 2
an electrode arranged to apply electric fields corresponding to images, which are displayed by the pixels, to areas of the liquid crystal layer, the areas corresponding to the pixels
Implementation Method 3
a light shielding element arranged to prevent light emitted from the pixels from being viewed in directions different from the display directions of the pixels
Data Source
AI summary
In a parallax barrier DV (Dual View) display apparatus, a TN (Twisted Nematic) liquid crystal display panel is adopted as a display device for display images. The TN liquid crystal display panel includes a pair of opposing substrates, a liquid crystal layer sandwiched therebetween, orientation films arranged to orient liquid crystal molecules constituting the liquid crystal layer, and electrodes arranged to independently apply electric fields to areas of the liquid crystal layer which correspond to respective pixels. The orientation films are oriented in such a manner that liquid crystal molecules in the aforesaid areas are oriented so that display directions of the pixels are parallel or substantially parallel to a viewing angle direction. This arrangement improves image separation capability in all display directions, in a DV (Dual View) display apparatus displaying different images in respective display directions, by a single display screen.