Wave Absorber Display Panel Viewing Angle Control

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Solution Overview

Problem

Display devices face challenges in maintaining brightness and aperture ratio while controlling viewing angles, often requiring additional light control films that increase power consumption and reduce lifetime, and can lead to decreased luminance and increased thickness.

Innovation Solution

Incorporating wave absorbers at both sides of the aperture area in the display panel to absorb specific wavelength bands of light, allowing for controlled viewing angles without additional light control films, and adjusting the area, height, and thickness of the wave absorbers to enhance transmittance and aperture ratio.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If additional light control films are used to control viewing angles, then viewing angle control is improved, but power consumption increases and device lifetime decreases

Engineering Contradiction:

Improveviewing angle controlVSAvoidpower consumption

Core Design Contradiction:

Ease of operationVSUse of energy by moving object

Solution Approach 1:

The patent combines the wave absorber structure with the bank structure, integrating viewing angle control functionality into the existing pixel structure. The wave absorber is formed on the same layer as the bank, eliminating the need for separate light control films and reducing overall device complexity while maintaining viewing angle control.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent extracts the viewing angle control function from separate light control films and implements it through the wave absorber structure integrated with the bank. This separation allows the wave absorber to perform both its primary function and viewing angle control without requiring additional independent components.

Inventive Principle:

Principle #2Taking out (Extraction)

2Ease of operation

If additional light control films are used to control viewing angles, then viewing angle control is improved, but display panel thickness increases

Engineering Contradiction:

Improveviewing angle controlVSAvoiddisplay panel thickness

Core Design Contradiction:

Ease of operationVSLength of stationary object

Solution Approach 1:

The wave absorber is integrated on the same layer as the bank structure, merging two functional elements into a single layer. This integration eliminates the need for additional light control films and prevents increase in display panel thickness while achieving effective viewing angle control.

Inventive Principle:

Principle #5Merging (Combining)

3Object-affected harmful factors

If privacy film is used to block side direction lights, then security and mirror image issues are resolved, but aperture ratio and brightness decrease

Engineering Contradiction:

Improvemirror image blockingVSAvoidaperture ratio

Core Design Contradiction:

Object-affected harmful factorsVSArea of stationary object

Solution Approach 1:

The wave absorber is positioned specifically at the side regions of the aperture area, creating local light absorption zones. This localized approach blocks side-direction light to prevent mirror images while leaving the central aperture area open, thereby maintaining a high aperture ratio and brightness.

Inventive Principle:

Principle #3Local quality

4Ease of operation

If wave absorber thickness is increased to control viewing angle, then viewing angle control improves, but transmittance and aperture ratio decrease

Engineering Contradiction:

Improveviewing angle controlVSAvoidlight transmittance

Core Design Contradiction:

Ease of operationVSIllumination intensity

Solution Approach 1:

The patent optimizes the wave absorber thickness to a specific range of 50-200 nm, which provides effective viewing angle control while minimizing impact on light transmittance. This precise parameter control allows the wave absorber to absorb side-direction light effectively while maintaining high transmittance for forward-direction light.

Inventive Principle:

Principle #35Parameter changes

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 effectively controls viewing angles, enhances transmittance, and maintains aperture ratio without additional light control films, reducing power consumption and extending the display device's lifetime while preventing thickness increase.

Implementation Method 1

a wave absorber for absorbing the light in the specific wavelength band

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Data Source

PatentUS11482579B2Display apparatus including wave absorber for absorbing light

Publication Date: 2022.10.25 LG DISPLAY CO LTD

AI summary

A display apparatus according to the present disclosure can include an anode electrode electrically connected to a thin film transistor disposed on a substrate of the display apparatus, a bank defining an aperture area exposing a portion of the anode electrode, an emission layer disposed on the anode electrode and radiating a light in a specific wavelength band, and a wave absorber disposing at both sides of the aperture area and absorbing the light in the specific wavelength band.