Backlight Unit Light Adjustment Layer for LCD Emission Cone

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Solution Overview

Problem

Conventional LCDs face inefficiencies in brightness due to the positioning of color filters and black matrix components, which block light and result in a narrower light emission cone, requiring more power to achieve specific brightness levels.

Innovation Solution

The implementation of a Color Filter on Array (COA) configuration in the LCD system, where the color filters are positioned before the liquid crystals, and the black matrix is co-located with the color filters, allowing for a wider light emission cone and improved brightness. Additionally, a light adjustment layer in the backlight unit adjusts the characteristics of illumination light to optimize its interaction with the prism film layers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If color filters and black matrix components are positioned after the liquid crystals, then the light emission cone is narrower, but the brightness is reduced and more power is required

Engineering Contradiction:

ImprovebrightnessVSAvoidpower consumption

Core Design Contradiction:

Illumination intensityVSUse of energy by moving object

Solution Approach 1:

The patent inverts the conventional arrangement by positioning color filters and black matrix components before the liquid crystals rather than after. This reversal allows light to pass through a wider emission cone from the backlight, increasing the effective light gathering area and improving brightness without requiring additional power

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent changes the spatial arrangement from a sequential vertical stacking to a lateral reconfiguration where color filters and black matrix are positioned in the plane before the liquid crystals. This dimensional rearrangement creates a wider light emission cone geometry, allowing more light to reach the liquid crystal layer and improving overall optical efficiency

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Adaptability or versatility

If color filters and black matrix components block light, then the light emission cone is narrower, but the viewing angle is limited

Engineering Contradiction:

Improveviewing angleVSAvoidbrightness

Core Design Contradiction:

Adaptability or versatilityVSIllumination intensity

Solution Approach 1:

By inverting the conventional order and placing color filters and black matrix before the liquid crystals, the patent allows light to traverse a wider angular cone before encountering the color filtering elements. This increases the effective viewing angle while maintaining brightness by reducing the blocking effect of these components

Inventive Principle:

Principle #13The other way round (Inversion)

3Productivity

If conventional LCD structure is used, then the light emission cone is narrower, but the optical efficiency is reduced

Engineering Contradiction:

Improveoptical efficiencyVSAvoidbrightness

Core Design Contradiction:

ProductivityVSIllumination intensity

Solution Approach 1:

The patent reconfigures the optical path geometry by positioning color filters and black matrix in the lateral plane before the liquid crystals, changing the light propagation dimension from a narrow vertical path to a wider angular cone. This geometric transformation increases optical efficiency by allowing more light to reach the liquid crystal layer and be converted into useful display output

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 and efficiency of the LCD system by widening the light emission cone and reducing power consumption, while also improving the viewing angle and optical efficiency of the display.

Implementation Method 1

a light adjustment layer in the backlight unit adjusts the characteristics of illumination light to optimize its interaction with the prism film layers

Methodology Applied

Scientific EffectLight refraction: Refraction

Implementation Method 2

The images are generated by modulating a voltage across each liquid crystal pixel to adjust the orientation of the liquid crystals in each pixel, and thus control the light output of the liquid crystal display

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Data Source

PatentUS12332519B2Backlight unit and color filter on array configuration for a liquid crystal display

Publication Date: 2025.06.17 META PLATFORMS TECHNOLOGIES LLC

AI summary

A liquid crystal display (LCD) system for a head mounted display includes an LCD panel and a backlight unit. The LCD panel includes a color filter on array (COA) configuration. The backlight unit includes a light adjustment layer to adjust at least one characteristic of illumination light from a light source to tune the illumination light for enlarging an emission cone of display light.