Transflective Display Panel Yellow-Shift Correction

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Solution Overview

Problem

Transflective LCDs suffer from yellow-shift in black and white reflective images, which affects image quality and viewing angles.

Innovation Solution

A display panel with a reflective region and a transparent region, featuring sub-pixel regions where a complementary color filter pattern is partially applied in the reflective region to adjust the yellow-shift, using a combination of color filter patterns and a display medium between substrates.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a reflective layer with protruding structures is used in the reflective region, then the image can be displayed normally from every viewing angle, but the black and white reflective images exhibit yellow-shift

Engineering Contradiction:

Improveviewing angleVSAvoidyellow-shift

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies different color filter patterns to different regions: the transparent region uses standard RGB color filters while the reflective region uses a complementary color filter pattern (yellow or magenta). This local differentiation allows each region to be optimized for its specific function - the transparent region for color display and the reflective region for wide viewing angle with reduced yellow-shift

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent introduces complementary color filter patterns (yellow or magenta) in the reflective region to counteract the yellow-shift phenomenon. By using colors that are complementary to yellow (i.e., blue or purple tones), the overall color balance is improved and yellow-shift is reduced while maintaining wide viewing angle performance

Inventive Principle:

Principle #32Color changes

2Object-affected harmful factors

If a complementary color filter pattern is applied to the sub-pixel regions of the reflective region, then the yellow-shift is adjusted, but the sub-pixel regions should not be completely covered

Engineering Contradiction:

Improveyellow-shiftVSAvoidcolor filter coverage

Core Design Contradiction:

Object-affected harmful factorsVSManufacturing precision

Solution Approach 1:

The patent applies the complementary color filter pattern partially to the sub-pixel regions of the reflective region rather than completely covering them. This partial coverage approach allows the complementary color filter to adjust yellow-shift in areas where it is most needed while leaving portions of the original color filter structure intact to maintain proper color balance and avoid over-correction

Inventive Principle:

Principle #16Partial or excessive action

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 solution effectively improves the black and white reflective image quality by adjusting the yellow-shift, ensuring better image display from various viewing angles without over-complementing, thus enhancing the transflective LCD's performance.

Implementation Method 1

The color filter patterns are respectively disposed in the sub-pixel regions of the transparent region on the first substrate or the second substrate. The foregoing single complementary color filter pattern is disposed in the sub-pixel regions of the reflective region on the first substrate or the second substrate.

Methodology Applied

Scientific EffectOptical filtering: Filter (optical)

Data Source

PatentUS8233121B2Display panel and color filter substrate

Publication Date: 2012.07.31 AU OPTRONICS CORP

AI summary

A display panel having a reflective region and a transparent region is provided. The reflective region and the transparent region respectively have sub-pixel regions. The display panel includes a first substrate, a second substrate, a plurality of color filter patterns, a single complementary color filter pattern and a display medium. The first substrate has a plurality of pixel structures disposed corresponding to the sub-pixel regions. The second substrate is disposed opposite to the first substrate. The color filter patterns are respectively disposed in the sub-pixel regions of the transparent region on the first or second substrate. The single complementary color filter pattern is disposed in the sub-pixel regions of the reflective region on the first or second substrate. The sub-pixel regions of the reflective region are not completely covered by the single complementary color filter pattern. The display medium is disposed between the first substrate and second substrate.