Ladder Pattern LCD Panel Sub-Pixels Reduce Diffraction Loss

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Solution Overview

Problem

Conventional liquid crystal display (LCD) panels with stripe or delta pixel arrangements experience high diffraction loss due to strong fringing fields, leading to a low color to white ratio (CWR) of less than 20%.

Innovation Solution

An LCD panel design featuring small pixels with a ladder pattern, where each pixel comprises multiple sub-pixels with sectors shifted by a unit width, and a color filter with ladder patterned layers, which helps in reducing diffraction loss by preserving polarization states and creating a suitable electric field.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If stripe or delta pixel arrangement is used, then pixel structure is simple, but diffraction loss increases and CWR decreases

Engineering Contradiction:

Improvepixel structureVSAvoiddiffraction loss

Core Design Contradiction:

Device complexityVSLoss of energy

Solution Approach 1:

The pixel structure is segmented into multiple sub-pixels (first, second, third sub-pixels) with different electrode pattern orientations. Each sub-pixel has its own specific electrode patterns arranged in particular directions, dividing the original pixel into functional segments that collectively reduce diffraction effects while maintaining structural organization.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The electrode patterns in different sub-pixels are arranged asymmetrically with respect to each other. The first sub-pixel has electrode patterns in a first direction, the second sub-pixel has patterns in a second direction, and the third sub-pixel has patterns in a third direction, creating asymmetric field distributions that cancel out fringing fields and reduce diffraction loss.

Inventive Principle:

Principle #4Asymmetry

2Ease of manufacture

If stripe or delta pixel arrangement is used, then manufacturing is simple, but color to white ratio becomes low

Engineering Contradiction:

Improvepixel fabricationVSAvoidcolor to white ratio

Core Design Contradiction:

Ease of manufactureVSIllumination intensity

Solution Approach 1:

The pixel is divided into multiple sub-pixels with distinct electrode pattern orientations, allowing selective control of light transmission for different color components. This segmentation enables better color separation and enhances the color to white ratio by optimizing the transmission characteristics of each sub-pixel type.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions (sub-pixels) within the pixel structure have different electrode pattern orientations and configurations optimized for their specific function. The first sub-pixel has patterns optimized for one color component, the second for another, and the third for a third component, creating local quality variations that improve overall color performance.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS10303011B2LCD panel with small pixels and sub-pixels having ladder pattern

Publication Date: 2019.05.28 HIMAX DISPLAY INC

AI summary

The present invention provides a liquid crystal display (LCD) panel. The LCD panel comprises: an electrode layer. The electrode layer comprises: a plurality of pixels, each pixel comprising a plurality of types of sub-pixels, each type of sub-pixel having a ladder pattern with a plurality of sectors, wherein each sector comprises a plurality of units and each sector is shifted a unit width with each other.