SP Wave Reflector for 3D LCD Brightness Enhancement

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Solution Overview

Problem

Conventional liquid crystal display devices with a parallax barrier suffer from reduced display brightness during 3D mode due to significant absorption of backlight light by the polarizer, leading to a strong demand for enhancing brightness in such configurations.

Innovation Solution

Incorporating a first SP wave reflector between the first and second liquid crystal display panels, which allows transmission of light with the same polarization direction and reflects light with orthogonal polarization, ensuring that backlight light corresponding to the light blocking regions is reflected back to the second liquid crystal display panel, thereby enhancing the brightness during 3D display without compromising 2D display brightness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a conventional liquid crystal display device uses a polarizer to block light in light blocking regions of the parallax barrier, then the 3D display function is achieved, but the display brightness is largely lowered

Engineering Contradiction:

Improve3D display functionVSAvoiddisplay brightness

Core Design Contradiction:

Adaptability or versatilityVSIllumination intensity

Solution Approach 1:

The patent converts the harmful light absorption effect of the polarizer into a beneficial light reflection effect by replacing the polarizer with an SP wave reflector. The SP wave reflector reflects the light that would have been absorbed, converting it into usable light that contributes to display brightness while maintaining the light blocking function necessary for 3D display.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent changes the optical parameter of the light control element from polarizing absorption to SP wave reflection. By using an SP wave reflector with specific polarization characteristics instead of a conventional polarizer, the system achieves both light blocking for 3D function and light reflection for brightness enhancement.

Inventive Principle:

Principle #35Parameter changes

2Ease of manufacture

If light blocking regions and light transmission regions in the parallax barrier are designed on a 1 to 1 basis, then the parallax barrier structure is simplified, but half of the backlight light is absorbed by the polarizer

Engineering Contradiction:

Improveparallax barrier structureVSAvoidbacklight light absorption

Core Design Contradiction:

Ease of manufactureVSLoss of energy

Solution Approach 1:

The patent converts the wasted absorbed light into useful reflected light. The SP wave reflector takes the light that would have been absorbed by the polarizer in the light blocking regions and reflects it back, converting energy loss into energy utilization and reducing overall energy waste.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

Instead of discarding the light absorbed by the polarizer, the patent recovers this light through reflection. The SP wave reflector captures and redirects the light that would have been lost, allowing it to be reused and contributing to improved display brightness.

Inventive Principle:

Principle #34Discarding and recovering

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 the brightness of 3D images by 5% to 32% compared to conventional devices, reducing power consumption and maintaining 2D display brightness, while also improving power efficiency and reducing viewer discomfort during mode switching.

Implementation Method 1

a first SP wave reflector which allows the transmission of light, which has a polarization component having the same polarization direction of the first SP wave reflector, of lights having two polarization components orthogonal to each other and reflects the light having polarization component which does not have the same polarization direction

Methodology Applied

Scientific EffectPolarization: Polarisation

Implementation Method 2

the backlight light, which passes through the second liquid crystal display panel, corresponding to the light blocking regions is reflected to the second liquid crystal display panel

Methodology Applied

Scientific EffectReflection: Reflection

Data Source

PatentUS9013646B2Liquid crystal display including parallax barrier liquid crystal display panel

Publication Date: 2015.04.21 MAGNOLIA WHITE CORP

AI summary

A display device includes: a first liquid crystal display panel which performs an image display; a second liquid crystal display panel which is arranged on a back surface side of the first liquid crystal display panel and performs a display of a parallax barrier pattern; a backlight unit which is arranged on a back surface side of the second liquid crystal display panel; and a first polarization reflector which is arranged between the first liquid crystal display panel and the second liquid crystal display panel, and allows the transmission of light having a polarization component, which has one polarization direction, of lights having two polarization components orthogonal to each other and reflects the light having a polarization component orthogonal to the polarization direction, wherein the first polarization reflector reflects the backlight light corresponding to the light blocking regions to the second liquid crystal display panel.