Display Light Adjuster With TN/ECB Stacking for Privacy
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Solution Overview
Problem
Existing display devices struggle to effectively reduce light leakage from one side that does not contribute to image visual recognition, particularly in vehicles where the image should only be viewable from certain angles.
Innovation Solution
A display device incorporating a light adjuster with a stacked configuration of a TN-mode and ECB-mode liquid crystal panels, along with polarization layers and retardation plates, to control light transmission and minimize light leakage from unwanted viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a single liquid crystal panel is used to control viewing angle, then the device complexity is low, but light leakage from oblique angles cannot be sufficiently reduced
Solution Approach 1:
The light adjuster is divided into multiple liquid crystal panels (first liquid crystal panel and second liquid crystal panel) with different liquid crystal modes (TN-mode and ECB-mode). Each panel segment contributes differently to light transmission control, enabling more effective suppression of light leakage from oblique angles while maintaining manageable device complexity through modular design.
2Object-affected harmful factors
If light transmission is reduced toward one side to control viewing angle, then privacy is improved, but light leakage toward the other side at large oblique angles still occurs
Solution Approach 1:
Different regions of the light adjuster are designed with different liquid crystal modes to provide localized light transmission characteristics. The first liquid crystal panel (TN-mode) and second liquid crystal panel (ECB-mode) create different optical properties in different areas, enabling precise control of light transmission angles and effective suppression of light leakage toward unauthorized viewing positions.
3Object-affected harmful factors
If multiple liquid crystal panels are stacked to reduce light leakage, then light transmission control is improved, but the device complexity increases
Solution Approach 1:
The light adjuster employs a composite structure combining multiple liquid crystal panels with different liquid crystal modes (TN-mode and ECB-mode). This composite approach leverages the complementary optical properties of different liquid crystal materials to achieve superior light transmission control and light leakage suppression that cannot be obtained with a single liquid crystal panel type.
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
The solution significantly reduces light emission from oblique angles, ensuring the image is only visible from intended viewing positions, thereby enhancing privacy and reducing unwanted visibility.
Implementation Method 1
a first liquid crystal panel and a second liquid crystal panel that are stacked in a direction in which the light source and the liquid crystal display panel face each other. The first liquid crystal panel is a TN-mode liquid crystal panel, and the second liquid crystal panel is an ECB-mode liquid crystal panel
Implementation Method 2
The light adjuster includes a first liquid crystal panel and a second liquid crystal panel
Data Source
AI summary
According to an aspect, a display device includes: a liquid crystal display panel including a display region configured to output an image; a light source configured to emit light to one surface side of the liquid crystal display panel; and a light adjuster interposed between the liquid crystal display panel and the light source and configured to control the transmission degree of light between the liquid crystal display panel and the light source. The light adjuster includes a first liquid crystal panel and a second liquid crystal panel that are stacked in a direction in which the light source and the liquid crystal display panel face each other. The first liquid crystal panel is a TN-mode liquid crystal panel, and the second liquid crystal panel is an ECB-mode liquid crystal panel.