OLED Sub-Pixel Structure for 2D and 3D Display Modes

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Solution Overview

Problem

Organic light emitting display devices using the polarized glasses technique face issues with crosstalk at viewing angles in 3D mode, leading to reduced luminance in 2D mode due to the need for black stripes, which limit the aperture ratio and result in a darker 2D image experience.

Innovation Solution

Incorporating a main OLED that emits light in both 2D and 3D modes and an auxiliary OLED that only emits light in 2D mode, with a patterned retarder to change polarizing characteristics, and a driver system that controls current supply to each OLED based on mode, ensuring the auxiliary OLED does not emit light in 3D mode to prevent crosstalk.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If black stripes are formed to prevent crosstalk in 3D mode, then viewing angle is improved, but aperture ratio is reduced and luminance is lowered in 2D mode

Engineering Contradiction:

Improveviewing angleVSAvoidluminance

Core Design Contradiction:

Stability of the object's compositionVSIllumination intensity

Solution Approach 1:

The sub-pixel is divided into two separate OLED regions: a main OLED that emits light in both 2D and 3D modes, and an auxiliary OLED that emits light only in 2D mode. This segmentation allows independent control of light emission for each mode, eliminating the need for black stripes that reduce aperture ratio while maintaining crosstalk prevention in 3D mode.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements dynamic control of the auxiliary OLED through a switching unit that connects or disconnects it based on the display mode. In 3D mode, the auxiliary OLED is disconnected to prevent crosstalk; in 2D mode, it is connected to increase aperture ratio and luminance. This dynamic switching resolves the contradiction between viewing angle stability and luminance intensity.

Inventive Principle:

Principle #15Dynamics

2Object-affected harmful factors

If black stripes are enlarged to broaden viewing angle in 3D mode, then crosstalk is reduced, but aperture ratio is reduced and 2D image brightness is lowered

Engineering Contradiction:

ImprovecrosstalkVSAvoidaperture ratio

Core Design Contradiction:

Object-affected harmful factorsVSArea of stationary object

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent changes the operational state of the auxiliary OLED based on display mode parameters. In 3D mode, the auxiliary OLED is turned off to eliminate crosstalk; in 2D mode, it is turned on to maximize aperture ratio and brightness. This parameter-based control resolves the contradiction between reducing crosstalk and maintaining aperture ratio.

Inventive Principle:

Principle #35Parameter changes

3Illumination intensity

If auxiliary OLED is added to increase aperture ratio in 2D mode, then luminance is improved, but device complexity increases

Engineering Contradiction:

ImproveluminanceVSAvoidstructure complexity

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

The main OLED and auxiliary OLED share common structural components including the cathode, electron transport layer, emission layer, hole transport layer, and anode structure. This merging of common components reduces the incremental complexity of adding the auxiliary OLED while still achieving increased aperture ratio and luminance in 2D mode.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The auxiliary OLED is designed with multi-functionality: it serves as a light-emitting element in 2D mode to increase aperture ratio and luminance, and as a non-emitting element in 3D mode to prevent crosstalk. This universal design allows a single component to address multiple requirements, reducing overall device complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 viewing angle for 3D images while maintaining brighter 2D image quality by reducing crosstalk and increasing the aperture ratio, allowing for a broader viewing angle and improved brightness in 2D mode without additional manufacturing processes or costs.

Implementation Method 1

a patterned retarder bonded to the organic light emitting panel, and configured to change polarizing characteristics of a left image and a right image which are output from the organic light emitting panel

Methodology Applied

Scientific EffectPolarization: Polarisation

Implementation Method 2

a main organic light emitting diode (OLED) which emits light in a two-dimensional (2D) mode and a three-dimensional (3D) mode and an auxiliary OLED which emits light in only the 2D mode

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS10139643B2OLED display having sub-pixel structure that supports 2D and 3D image display modes

Publication Date: 2018.11.27 LG DISPLAY CO LTD

AI summary

Discussed is an organic light emitting display device. The organic light emitting display device can include an organic light emitting panel in which a main organic light emitting diode (OLED) which emits light in a two-dimensional (2D) mode and a three-dimensional (3D) mode and an auxiliary OLED which emits light in only the 2D mode are disposed in each of a plurality of sub-pixels, a panel driver configured to drive the organic light emitting panel, and a patterned retarder bonded to the organic light emitting panel, and configured to change polarizing characteristics of a left image and a right image which are output from the organic light emitting panel.