Under-Display Panel Layout for Rear Camera Light Transmission

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Solution Overview

Problem

Existing display devices face challenges in integrating optical electronic devices like cameras and sensors without reducing the display area or exposing them on the front side, often requiring bezel enlargement or notches.

Innovation Solution

A display panel design with optical electronic devices positioned at the backside, incorporating a light transmission structure and a touch panel with specific mesh and electrode configurations to maintain display area and sensitivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If optical electronic devices are installed on the front side of the display panel to receive light, then the optical devices can function properly, but the display area is reduced and the devices are exposed on the front side

Engineering Contradiction:

Improveoptical device functionVSAvoiddisplay area

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The patent inverts the conventional placement of optical electronic devices from the front side to the back side of the display panel. The optical devices are positioned in the non-display area at the rear, allowing light to pass through the display panel to reach them, thus maintaining full display area while enabling optical functionality.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent transitions from a two-dimensional front-side placement to a three-dimensional rear-side placement with light transmission through the panel. This dimensional change allows optical devices to be integrated without occupying front display space, utilizing the depth dimension of the display panel structure.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Adaptability or versatility

If a touch panel is added to the display panel, then touch functionality is provided, but touch sensitivity may decrease in the under-display camera area

Engineering Contradiction:

Improvetouch functionalityVSAvoidtouch sensitivity

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent applies different mesh densities to different regions of the touch panel. The first touch area corresponding to the under-display camera area has a lower mesh density to maintain touch sensitivity, while the second touch area has a higher mesh density for standard touch functionality, allowing localized optimization of touch characteristics.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the mesh parameters (mesh size and density) of the touch panel in different regions. By adjusting these parameters, the touch sensitivity in the under-display camera area is preserved while maintaining overall touch panel functionality.

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If the bezel area is enlarged to accommodate optical devices, then the devices can be installed, but the display area is reduced

Engineering Contradiction:

Improvedevice installationVSAvoiddisplay area

Core Design Contradiction:

Ease of manufactureVSArea of stationary object

Solution Approach 1:

Instead of placing optical devices in the front bezel area, the patent inverts the approach by positioning them in the rear non-display area. This eliminates the need to enlarge the front bezel and maintains the full display area while providing proper installation space for optical devices.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent utilizes the vertical dimension (depth of the display panel) to accommodate optical devices in the rear non-display area, transforming a two-dimensional bezel problem into a three-dimensional space utilization solution.

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

Preserves the display area and prevents exposure of optical devices while enhancing touch sensitivity and allowing for bezel reduction.

Implementation Method 1

a light transmission structure configured to transmit light

Methodology Applied

Scientific EffectLight transmission: Light

Implementation Method 2

a capacitive touch electrode configured to detect a capacitance generated between a driving touch electrode and a sensing touch electrode by a mutual capacitance sensing method

Methodology Applied

Scientific EffectMutual capacitance sensing: Capacitance

Data Source

PatentUS20250362776A1Display panel and display device including the same

Publication Date: 2025.11.27 LG DISPLAY CO LTD

AI summary

A display device can include a substrate having a display area and a non-display area adjacent to the display area. The display area includes a first sub-display area having a plurality of light transmission areas and a second sub-display area adjacent to the first sub-display area. The display device can further include a shield layer on the substrate, an active layer on the shield layer, a gate insulating layer on the active layer, a gate electrode on the gate insulating layer, an interlayer insulating film on the gate electrode, a first source-drain electrode on the interlayer insulating film, a first planarization layer on the first source-drain electrode, a second source-drain electrode disposed on the first planarization layer and electrically connected to the first source-drain electrode through a contact hole in the first planarization layer, and a second planarization layer on the second source-drain electrode.