Stereoscopic Display Brightness Loss via Switchable Barrier and Polarizing Films
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Solution Overview
Problem
Conventional barrier type stereoscopic display devices experience brightness deterioration due to reflective metal patterns, which affect the opening rate and brightness, especially during 3D image display.
Innovation Solution
A stereoscopic image display device is designed with a switchable barrier cell that functions as a barrier only when voltage is applied, and includes a first and second brightness enhancement polarizing film to recycle and enhance light transmission, reducing brightness loss by dividing the barrier cell into black and white regions for 3D image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a switchable barrier is used to prevent deterioration in opening rate and brightness during 2D image display, then the opening rate and brightness are improved during 2D display, but the black region functions as a barrier pattern during 3D image display, causing considerable brightness deterioration
Solution Approach 1:
The barrier cell is designed to be switchable between transparent and barrier states through voltage application. During 2D display, the barrier cell is transparent to maximize brightness. During 3D display, voltage is applied to create the barrier pattern. This dynamic switching resolves the contradiction by adapting the barrier cell's optical properties to different display modes.
Solution Approach 2:
The invention changes the optical parameters of the barrier cell by applying voltage to switch between transparent and barrier states. Additionally, brightness enhancement polarizing films are introduced to modify the light transmission characteristics, improving brightness during 3D display by recycling polarized light that would otherwise be lost.
2Adaptability or versatility
If a barrier pattern is used during 3D image display to separate left and right eye images, then the stereoscopic effect is achieved, but the reflective metal pattern intercepts light, causing deterioration in opening rate and brightness
Solution Approach 1:
Brightness enhancement polarizing films are introduced as intermediary elements between the backlight and the barrier cell. These films polarize the light and enable light recycling, mediating between the need for a barrier pattern and the need for high brightness. The polarizing films allow the barrier to function while minimizing light interception losses.
Solution Approach 2:
The invention changes the polarization state of light using polarizing films to improve brightness during 3D display. By controlling the polarization parameters and using switchable barrier states, the system maintains both 3D capability and acceptable brightness levels.
3Device complexity
If a conventional barrier pattern is used, then the barrier structure is simple, but the opening rate and brightness deteriorate due to light interception by reflective metal patterns
Solution Approach 1:
The invention uses composite structures including barrier cells filled with liquid crystals, brightness enhancement polarizing films with specific polarization characteristics, and reflective layers. This composite approach maintains structural simplicity while improving brightness through the coordinated function of multiple materials with complementary properties.
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 the brightness difference between 2D and 3D image displays, achieving enhanced brightness and high-definition viewing without increasing power consumption, with the brightness enhancement polarizing films above and below the barrier cell improving light recycling and transmission.
Implementation Method 1
a first brightness enhancement polarizing film attached to an upper surface of the barrier cell
Data Source
AI summary
The present invention is for a stereoscopic image display device to achieve enhanced brightness during 3D image display using a switchable barrier and brightness enhancement polarizing films, the stereoscopic image display device includes a backlight unit to transmit light upward, a barrier cell located on the backlight unit, the barrier cell functioning as a barrier when voltage is applied thereto and a transparent cell when voltage is not applied thereto, a first brightness enhancement polarizing film attached to an upper surface of the barrier cell, and an image panel located on the first brightness enhancement polarizing film.