Color Filter Layer Design for Inkjet Printing and Reflectivity Reduction

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Solution Overview

Problem

The challenge lies in printing a color filter layer for small-sized high-resolution display panels, where conventional methods face difficulties due to high resolution requirements and the need for multiple photolithography processes, which complicates encapsulation and increases reflectivity.

Innovation Solution

A display panel design featuring a color filter layer composed of first and second light shielding portions with different widths, combined with a color resist layer, which reduces printing difficulty and reflectivity, and includes an anti-reflection film to minimize optical interference, utilizing a manufacturing method that reduces the number of photolithography processes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional photolithography processes are used for color filter layer fabrication, then manufacturing precision can be maintained, but device complexity and encapsulation requirements increase significantly

Engineering Contradiction:

Improvecolor filter layer precisionVSAvoidencapsulation complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent extracts the color filter pattern formation from the conventional photolithography process and implements it through direct inkjet printing of color resists. This removes the need for multiple photolithography steps, photoresist coating, and associated encapsulation requirements, while maintaining the ability to achieve high-resolution color filter patterns.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces the mechanical photolithography system (photoresist coating, exposure, development) with a digital printing system that directly deposits color resist materials in the desired pattern. This substitution eliminates complex encapsulation requirements while preserving manufacturing precision through digital control of the printing process.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Object-affected harmful factors

If polarizers are used to reduce reflectivity, then optical performance improves, but light output loss increases significantly

Engineering Contradiction:

ImprovereflectivityVSAvoidlight output

Core Design Contradiction:

Object-affected harmful factorsVSLoss of energy

Solution Approach 1:

The patent changes the optical parameters of the display panel by replacing the polarizer with a color filter layer that has optimized optical properties. The color filter layer achieves reflectivity reduction through its structural design and material properties while maintaining higher light transmission, thus reducing energy loss compared to conventional polarizer-based solutions.

Inventive Principle:

Principle #35Parameter changes

3Area of moving object

If small-sized display panels with high resolution are manufactured, then product miniaturization is achieved, but printing difficulty increases

Engineering Contradiction:

Improvedisplay panel sizeVSAvoidprinting difficulty

Core Design Contradiction:

Area of moving objectVSEase of manufacture

Solution Approach 1:

The patent replaces conventional photolithography printing with direct inkjet printing technology, which offers better control for small-sized high-resolution displays. The digital printing system can precisely deposit color resists in the required patterns at small scales without the limitations of photolithography, thereby reducing printing difficulty while achieving miniaturization.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Manufacturing precision

If multiple photolithography processes are used, then color filter layer precision is maintained, but productivity decreases

Engineering Contradiction:

Improvecolor filter layer precisionVSAvoidmanufacturing efficiency

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The patent merges multiple separate photolithography processes into a single direct printing operation. The inkjet printing system can deposit multiple color resists in one pass or sequentially without requiring repeated photoresist coating, exposure, and development cycles, thereby maintaining color filter precision while significantly improving manufacturing productivity.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS11374063B2Display panel with color filter layer and anti-reflection film layer and manufacturing method thereof

Publication Date: 2022.06.28 WUHAN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO LTD

AI summary

The present invention provides a display panel and a manufacturing method of the display panel. The display panel includes a base substrate, a light emitting device layer, an encapsulation layer, and a color filter layer. The color filter layer includes multiple first light shielding portions, multiple color resists, and multiple second light shielding portions. An opening is formed between each two adjacent second light shielding portions and arranged corresponding to the pixel unit. The present invention increases an area for inkjet printing in a high-resolution small-sized display panel and reduces the reflectivity of the display panel to ambient light, and edges of the color filter layer less affect a light emitting device.