Display Panel Touch Layer Filter Structure

Solution Overview

Problem

The direct on touch (DOT) structure integrated above the polarizing layer in display panels is thick, reduces light transmittance, and accelerates panel aging, compromising display quality and thinness.

Innovation Solution

A display panel design with a touch layer containing filters integrated above a light emitting layer, replacing the polarizer, where the filters are positioned in gaps corresponding to light emitting units, and a light shielding layer is used to reduce reflection and enhance transmittance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a polarizer is used to reduce reflectance of the display panel under strong light, then reflectance is reduced, but the thickness of the display panel increases and light transmittance decreases

Engineering Contradiction:

ImprovereflectanceVSAvoidthickness

Core Design Contradiction:

Object-affected harmful factorsVSLength of stationary object

Solution Approach 1:

The patent extracts and removes the polarizer from the display panel structure, replacing it with a touch layer that has gaps corresponding to light emitting units. This eliminates the need for a separate polarizing layer while maintaining the desired optical properties and reducing thickness.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent merges the touch layer and filter structure into a single integrated component, where the touch layer includes gaps that directly correspond to light emitting units and filters are positioned within these gaps. This integration eliminates the need for separate polarizer and touch layer components.

Inventive Principle:

Principle #5Merging (Combining)

2Object-affected harmful factors

If a polarizer is used to reduce reflectance of the display panel under strong light, then reflectance is reduced, but light transmittance is seriously reduced

Engineering Contradiction:

ImprovereflectanceVSAvoidlight transmittance

Core Design Contradiction:

Object-affected harmful factorsVSLoss of energy

Solution Approach 1:

The patent extracts and removes the polarizer from the display panel structure, replacing it with a touch layer that has gaps corresponding to light emitting units. This eliminates the need for a separate polarizing layer while maintaining the desired optical properties and reducing thickness.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent uses filters positioned within the gaps of the touch layer to control light transmission by color/wavelength. These filters are designed to transmit specific wavelengths while blocking others, achieving selective light transmission without the thickness and transmittance loss associated with polarizers.

Inventive Principle:

Principle #32Color changes

3Object-affected harmful factors

If a polarizer is used in the display panel structure, then reflectance is reduced, but the service life of the display panel is accelerated aging

Engineering Contradiction:

ImprovereflectanceVSAvoidservice life

Core Design Contradiction:

Object-affected harmful factorsVSDuration of action of stationary object

Solution Approach 1:

The patent extracts and removes the polarizer from the display panel structure, replacing it with a touch layer that has gaps corresponding to light emitting units. This eliminates the need for a separate polarizing layer while maintaining the desired optical properties and reducing thickness.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces the durable but problematic polarizer with a touch layer structure that includes filters. This new structure is designed to be more durable and resistant to aging while maintaining the desired optical properties, effectively extending the service life of the display panel.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 thickness of the display panel, improves light transmittance, and extends the panel's service life while simplifying the manufacturing process and reducing production costs.

Implementation Method 1

a light shielding layer, wherein an area of the light shielding layer is greater than an area of the first metal layer, a projection of the light shielding layer on the light emitting layer covers a projection of the first metal layer on the light emitting layer

Methodology Applied

Scientific EffectLight blocking/absorption: Absorption (EM radiation)

Implementation Method 2

a filter structure comprising a plurality of filters, wherein the filters are disposed in the plurality of gaps of the touch trace layer; the plurality of filters and the plurality of light emitting units are in one-to-one correspondence

Methodology Applied

Scientific EffectOptical filtering: Filter (optical)

Data Source

PatentUS10871844B1Display panel and method of fabricating thereof

Publication Date: 2020.12.22 WUHAN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO LTD

AI summary

The present application provides a display panel and a method of fabricating thereof. The display panel includes a light emitting layer and a touch layer. The touch layer includes a touch trace layer and a filter structure, and the touch trace layer includes a plurality of gaps. The touch trace layer includes a first metal layer, a light shielding layer and a second metal layer, and an area of the light shielding layer is greater than an area of the first metal layer. Projections of the plurality of gaps on a light emitting surface of the display panel separates with a projection of the first metal layer and the second metal layer on the light emitting layer.