Switchable 2D-3D Display Using Electroluminescent Layer
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Solution Overview
Problem
Conventional display devices switchable between 2D and 3D modes are thick and have high manufacturing costs due to the use of liquid crystal shutter slit gratings.
Innovation Solution
A display device comprising a display panel, a backlight, a parallax barrier between the polarizers, and an electroluminescent layer that switches between a luminescent and light-transmitting state to enable 2D and 3D modes without increasing thickness, using a first and second transparent electrode with patterns corresponding to the parallax barrier's opaque stripes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If liquid crystal shutter slit grating is used to implement switchable 2D/3D display, then the display device can switch between modes, but the device becomes thick and manufacturing cost increases
Solution Approach 1:
The patent merges the parallax barrier structure directly with the display panel by forming it on the backlight side of the polarizer, eliminating the need for separate liquid crystal shutter modules. This integration reduces overall device thickness while maintaining switchable 2D/3D functionality through electroluminescent layer control.
Solution Approach 2:
The patent replaces the mechanical liquid crystal shutter system with an electroluminescent layer that can be electrically controlled to emit or transmit light. This substitution eliminates thick liquid crystal modules and associated drive circuits, achieving mode switching through electrical control of light emission rather than mechanical optical element manipulation.
2Adaptability or versatility
If liquid crystal shutter slit grating is used to implement switchable 2D/3D display, then the display device can switch between modes, but manufacturing cost increases
Solution Approach 1:
The patent combines multiple functions (parallax barrier, light source control, display panel) into a single integrated structure where the electroluminescent layer serves both as a light source for 2D mode and as a controllable element for mode switching. This reduces the number of separate components that need to be manufactured and assembled, thereby lowering manufacturing cost.
Solution Approach 2:
The electroluminescent layer performs multiple functions: it serves as the light source for 2D display mode, as a controllable light blocking element for 3D mode switching, and integrates with the parallax barrier structure. This multi-functionality eliminates the need for dedicated liquid crystal shutter components, reducing overall manufacturing complexity and cost.
3Length of moving object
If electroluminescent layer is used to compensate for slit light source, then device thickness is reduced, but manufacturing complexity arises
Solution Approach 1:
The patent extracts the light-emitting function from the traditional backlight unit and places it directly in the electroluminescent layer formed on the polarizer substrate. This extraction simplifies the overall structure by eliminating the need for separate liquid crystal shutter modules and their associated drive circuits, even though it introduces electroluminescent material processing requirements.
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 allows for lightweight and thin display devices with reduced manufacturing costs, improving market competitiveness and promoting the switchable 2D/3D technology by controlling the electroluminescent layer's state to compensate for the slit light source, ensuring effective 2D and 3D display effects.
Implementation Method 1
an electroluminescent layer that switches between a luminescent and light-transmitting state to enable 2D and 3D modes
Implementation Method 2
a parallax barrier 20' (i.e., a slit light grating) on a side of the interface displayed by a display panel 10'. The principles of implementation of 3D display are as illustrated in FIG. 1. The parallax barrier 20' has a slit grating structure, and images of pixels on the display panel 10' are transmitted to observation points via a slit on the parallax barrier 20'.
Implementation Method 3
liquid crystal molecules of the liquid crystal layer 60' corresponding to electrode bars of the first transparent electrode 40' in terms of position are subject to deflection, and light fails to pass though but only passes through the slits between the electrode bars
Data Source
AI summary
This disclosure discloses a display device switchable between a 2D display mode and a 3D display mode, wherein a parallax barrier is disposed between a first polarizer and a backlight to implement glassless-type 3D display. A first transparent electrode, an electroluminescent layer, and a second transparent electrode are sequentially disposed between the first polarizer and the parallax barrier, the first transparent electrode and/or the second transparent electrode at least having a pattern corresponding to opaque stripes of a slit light source. Switchover between the 2D display mode and the 3D display mode may be implemented by controlling whether or not to apply a voltage to the electroluminescent layer. The switchover between a 2D display mode and a 3D display mode may be implemented only by adding an electroluminescent layer, and the thickness of the display device is not increased.