Double-Sided Display Using OLED Backlight and Light Shielding

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Solution Overview

Problem

Existing double-sided display devices using stacked OLED panels face challenges with high power consumption and cost, which affects their market competitiveness.

Innovation Solution

A double-sided display device is designed with a liquid crystal display panel and an organic light-emitting display panel arranged opposite to each other, incorporating a light diffusion structure, a light shielding layer, and a brightness detection module to optimize light usage and reduce power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If two OLED panels are stacked to form a double-sided display device, then the display quality and response speed are improved, but the power consumption and cost increase

Engineering Contradiction:

Improvedisplay qualityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent combines an OLED panel and an LCD panel into a single double-sided display device. The OLED panel provides high-quality display on one side while serving as a backlight source for the LCD panel on the other side, merging two display technologies into one integrated system that reduces overall power consumption compared to using two separate OLED panels.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The OLED panel serves multiple functions: it acts as a display panel for high-quality images on its display side, and simultaneously serves as a backlight source for the LCD panel on its opposite side. This multi-functionality eliminates the need for a separate backlight module and reduces the number of components required.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If two OLED panels are stacked to form a double-sided display device, then the display quality and response speed are improved, but the cost increases

Engineering Contradiction:

Improvedisplay qualityVSAvoidcost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent uses an LCD panel instead of a second OLED panel for the back side display. LCD technology is more成熟 and cost-effective, allowing the device to achieve double-sided display functionality at a lower cost point while maintaining acceptable display quality for the LCD side.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Manufacturing precision

If a light shielding layer is added to block light from affecting the LCD display, then the display quality is improved, but the light utilization efficiency decreases

Engineering Contradiction:

Improvedisplay qualityVSAvoidlight utilization efficiency

Core Design Contradiction:

Manufacturing precisionVSLoss of energy

Solution Approach 1:

The light shielding layer is selectively positioned only in the non-display areas and pixel regions where it is needed to prevent light interference. The display areas remain transparent to allow light passage, creating local variations in optical properties that protect the LCD display quality while maximizing light utilization in the display regions.

Inventive Principle:

Principle #3Local quality

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 reduces power consumption and cost while enhancing the quality of double-sided display images, thereby improving market competitiveness.

Implementation Method 1

The organic light-emitting display panel includes an organic light-emitting layer. The organic light-emitting layer emits light in a first direction and a second direction. The first direction and the second direction are opposite directions.

Methodology Applied

Scientific EffectOrganic light-emitting: Electroluminescence

Implementation Method 2

A light diffusion structure is arranged between each pixel of the organic light-emitting display panel and the respective pixel of the liquid crystal display panel.

Methodology Applied

Scientific EffectLight diffusion: Scattering

Implementation Method 3

A light shielding layer is arranged between the light diffusion structure and each pixel of the organic light-emitting display panel. Part of the light in the first direction is shielded by the light shielding layer.

Methodology Applied

Scientific EffectLight shielding: Absorption (EM radiation)

Data Source

PatentUS20250199351A1Double-sided display device and driving method thereof

Publication Date: 2025.06.19 HKC CORP LTD

AI summary

A double-sided display device and a driving method thereof are disclosed. The double-sided display device includes an LCD panel and an OLED panel oppositely arranged. A light diffusion structure is arranged between the OLED panel and the LCD panel. A light shielding layer is arranged between the light diffusion structure and the OLED panel. The light shielding layer has a width less than that of an opening area of each pixel of the LCD panel. The organic light-emitting layer emits light in a first direction and a second direction opposite to the first direction. The light in the first direction is partially shielded by the light shielding layer, and partially passes through the light diffusion structure to reach the opening area to realize display of the LCD panel. The light in the second direction displays a front side image on a display surface of the OLED panel.