Display Panel Layer Structure for Through-Hole Mura Reduction

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Solution Overview

Problem

Display modules often suffer from luminance non-uniformity, known as 'mura,' due to differences in light reflection and absorption, particularly around through holes for external functional modules like fingerprint sensors.

Innovation Solution

A display panel design that includes a display module, a color layer, and a light absorption layer, where the color layer is positioned between the display module and the light absorption layer, and through holes are defined in both the color layer and the light absorption layer to align with external functional modules, allowing light to be reflected back to the display module uniformly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a through hole is defined in the light absorption layer for external functional modules, then the functional module can be accessed, but the light output uniformity deteriorates causing mura

Engineering Contradiction:

Improveaccess to external functional moduleVSAvoidlight output uniformity

Core Design Contradiction:

Adaptability or versatilityVSIllumination intensity

Solution Approach 1:

A color layer is introduced as an intermediary between the display module and the light absorption layer. This color layer reflects light back to the display module, mediating the light path so that light can reach the external functional module through the through hole while maintaining uniform light output appearance on the display surface.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The solution addresses the light uniformity problem by adding a dimensional element - the color layer is positioned at a different depth dimension between the display module and light absorption layer, creating a multi-layer structure that manages light paths in three-dimensional space.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Adaptability or versatility

If no light absorption material is placed at the through hole region, then the functional module can operate, but light reflection difference increases causing brightness non-uniformity

Engineering Contradiction:

Improvefunctional module operationVSAvoidluminance uniformity

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The color layer serves as a mediator that reflects light uniformly. By positioning this reflective color layer before the light absorption layer, the system achieves both functional module access and uniform light reflection, resolving the contradiction between operational accessibility and luminance precision.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Object-affected harmful factors

If light is absorbed directly by the light absorption layer, then light leakage is prevented, but light output difference between through hole and non-through hole regions increases

Engineering Contradiction:

Improvelight leakage preventionVSAvoidlight output consistency

Core Design Contradiction:

Object-affected harmful factorsVSIllumination intensity

Solution Approach 1:

The light management function is segmented into two distinct layers: a color layer for light reflection and a light absorption layer for light leakage prevention. This segmentation allows each layer to perform its specific function - the color layer maintains light output consistency by reflecting light, while the light absorption layer prevents light leakage - without interfering with each other's effectiveness.

Inventive Principle:

Principle #1Segmentation

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 design reduces the light output difference between regions with and without through holes, thereby minimizing the mura problem and enhancing the uniformity of images displayed on the panel.

Implementation Method 1

the light emitted by the display module and the light entered into the display module from the outside can firstly arrive at the color layer and be reflected back to the display module by the color layer

Methodology Applied

Scientific EffectLight reflection: Reflection

Implementation Method 2

light can be reflected back to the display module from both the region corresponding to the first through hole and the region corresponding to the outside of the first through hole, thereby reducing the light output difference of the display module

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Data Source

PatentUS12256598B2Display panels and display devices

Publication Date: 2025.03.18 SUZHOU GOVISIONOX INNOVATION TECHNOLOGY CO LTD

AI summary

The present disclosure relates to a display panel and a display device. The display panel includes a display module, at least one color layer, and a light absorption layer. The display module has a display face and a non-display face opposite to the display face. The at least one color layer is disposed at a side of the display module away from the display face. The light absorption layer disposed at a side of the at least one color layer away from the display module. A first through hole is defined in the light absorption layer. A second through hole is defined in the at least one color layer. The second through hole is located corresponding to and in communication with the first through hole. The first through hole and the second through hole are located corresponding to an external functional module.