Liquid Crystal Display Reflection Film Light Utilization

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Solution Overview

Problem

In liquid crystal display devices, the pixel opening ratio is limited to approximately 50%, resulting in half of the backlight light being absorbed in light shielding regions, leading to suboptimal light utilization and brightness.

Innovation Solution

A liquid crystal display device with a reflection film made of a metal thin film on the substrate facing the backlight unit, allowing backlight light to pass through the opening regions and be reflected back, enhancing light utilization efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If light shielding regions are provided between pixels to prevent color mixing and signal line observation, then pixel display quality is improved, but the opening ratio of pixels decreases to approximately 50%, reducing light utilization efficiency

Engineering Contradiction:

Improvepixel display qualityVSAvoidlight utilization efficiency

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The invention converts the harmful effect of light shielding (which blocks and absorbs backlight light) into a beneficial effect by providing a reflection film on the backlight unit side substrate. This reflection film reflects the blocked light back through the liquid crystal layer, transforming the previously wasted light into useful display light, thereby improving light utilization efficiency while maintaining the necessary light shielding between pixels

Inventive Principle:

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

Solution Approach 2:

The invention recovers the light that would otherwise be discarded by the light shielding regions. The reflection film captures the light blocked by shielding structures and redirects it back through the display, allowing the same light to contribute to image display multiple times and significantly improving overall light utilization efficiency

Inventive Principle:

Principle #34Discarding and recovering

2Illumination intensity

If the opening ratio of pixels is increased to enhance brightness, then light utilization efficiency is improved, but light shielding between pixels becomes insufficient, causing color mixing and signal line observation

Engineering Contradiction:

Improvedisplay brightnessVSAvoidpixel isolation

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The reflection film transforms the light that would be wasted in light shielding regions into useful display light, enabling the system to achieve high brightness even with reduced opening ratios, thereby maintaining pixel isolation while improving display brightness

Inventive Principle:

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

3Loss of energy

If a light shielding film with high reflectance is formed on the polarizer to enhance light utilization efficiency, then light utilization is improved, but extremely high alignment accuracy becomes necessary

Engineering Contradiction:

Improvelight utilization efficiencyVSAvoidalignment accuracy

Core Design Contradiction:

Loss of energyVSManufacturing precision

Solution Approach 1:

Instead of forming a complex high-reflectance light shielding film on the polarizer with stringent alignment requirements, the invention uses a simpler reflection film on the backlight unit side substrate that achieves similar or better light utilization efficiency without requiring extremely high alignment accuracy, thereby simplifying the manufacturing process

Inventive Principle:

Principle #26Copying

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 effectively increases the brightness of the non-self-luminous display by improving light utilization from the backlight unit, reducing light absorption in shielding regions.

Implementation Method 1

a reflection film formed of a metal thin film in which an opening region corresponding to the light transmitting region is formed on a liquid crystal layer side of the transparent substrate on the backlight part side, and the backlight light which is incident on the opening region passes through the opening region and reaches the liquid crystal layer side, and the backlight light which is incident on a region where the reflection film is formed is reflected toward the backlight part side

Methodology Applied

Scientific EffectReflection: Reflection

Data Source

PatentUS8934069B2Liquid crystal display device

Publication Date: 2015.01.13 MAGNOLIA PURPLE CORP

AI summary

Provided is a liquid crystal display device which includes: a pair of transparent substrates which are arranged to face each other in an opposed manner with a liquid crystal layer sandwiched therebetween; a non-self-luminous display part having at least a light transmitting region which allows light to pass therethrough and a light shielding region which shields light; and a backlight part, wherein the transparent substrate arranged on a backlight part side includes a reflection film formed of a metal thin film in which an opening region corresponding to the light transmitting region is formed on a liquid crystal layer side of the transparent substrate on the backlight part side, and the backlight light incident on the opening region passes through the opening region, and the backlight light incident on a region where the reflection film is formed is reflected toward the backlight part side.