Touch Panel Color Filters Replace Polarizing Films in Displays

Solution Overview

Problem

Light emitting display devices face issues with reduced brightness and increased manufacturing costs due to the use of polarizing films and λ/4 wavelength films to prevent external light reflection, which also add thickness and complexity to the manufacturing process.

Innovation Solution

Replacing polarizing films and λ/4 wavelength films with color filters on the touch panel, which enhances light efficiency and eliminates the need for a separate substrate on the display panel, thereby simplifying the manufacturing process and reducing costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If polarizing film and λ/4 wavelength film are used to prevent external light reflection, then reflection prevention is improved, but brightness decreases and manufacturing cost increases

Engineering Contradiction:

Improveexternal light reflectionVSAvoidbrightness

Core Design Contradiction:

Object-affected harmful factorsVSIllumination intensity

Solution Approach 1:

The patent combines the color filter layer with the touch panel substrate, integrating multiple functions (color filtering and touch sensing) into a single component. This eliminates the need for separate polarizing film and λ/4 wavelength film layers, reducing total layer count while maintaining reflection prevention and color display capabilities.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The touch panel substrate is designed to serve multiple functions: as the structural base for the touch sensor, as the substrate for color filters, and as part of the optical stack for reflection prevention. This multi-functional design replaces multiple specialized components with a single versatile element.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Object-affected harmful factors

If polarizing film and λ/4 wavelength film are used to prevent external light reflection, then reflection prevention is improved, but manufacturing cost increases

Engineering Contradiction:

Improveexternal light reflectionVSAvoidmanufacturing cost

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The patent combines the color filter layer with the touch panel substrate, integrating multiple functions (color filtering and touch sensing) into a single component. This eliminates the need for separate polarizing film and λ/4 wavelength film layers, reducing total layer count while maintaining reflection prevention and color display capabilities.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The touch panel substrate is designed to serve multiple functions: as the structural base for the touch sensor, as the substrate for color filters, and as part of the optical stack for reflection prevention. This multi-functional design replaces multiple specialized components with a single versatile element.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Stability of the object's composition

If separate substrate for color filters is included in display panel, then color filter stability is improved, but device thickness increases

Engineering Contradiction:

Improvecolor filter stabilityVSAvoiddevice thickness

Core Design Contradiction:

Stability of the object's compositionVSLength of moving object

Solution Approach 1:

The patent combines the color filter layer with the touch panel substrate, integrating multiple functions (color filtering and touch sensing) into a single component. This eliminates the need for separate polarizing film and λ/4 wavelength film layers, reducing total layer count while maintaining reflection prevention and color display capabilities.

Inventive Principle:

Principle #5Merging (Combining)

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 use of color filters improves brightness and reduces manufacturing costs while maintaining similar reflection efficiency, resulting in a thinner and more efficient light emitting display device.

Implementation Method 1

The color filters have a higher emitted light efficiency higher than that of the polarizing film and the λ/4 wavelength film

Methodology Applied

Scientific EffectLight absorption and transmission: Absorption (EM radiation)

Data Source

PatentUS9812513B2Light emitting display device and method of manufacturing the same

Publication Date: 2017.11.07 SAMSUNG DISPLAY CO LTD

AI summary

A light emitting display device including a light emitting display panel including light emitting areas, a non-light emitting area disposed adjacent to the light emitting areas, and light emitting devices respectively disposed in the light emitting areas, and a touch panel disposed on the display panel, the touch panel including color filters respectively facing the light emitting areas.