Field Sequential Color Display Method Using Two Composite Fields

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Solution Overview

Problem

Conventional field sequential color displays require high-frequency color field driving, leading to high production costs and susceptibility to color break-up, especially when using three primary color fields, which limits their commercial viability and image quality.

Innovation Solution

A displaying method using two color fields, where each field includes a combination of at least two different color image optical stimuli, allowing for the generation of a full color image without color filters and at a reduced frequency, utilizing zoned backlighting and liquid crystal compensation signals to control the display.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If three primary color fields are used in field sequential color displays, then full color image can be formed, but displaying frequency must be 180 Hz or above which increases production cost

Engineering Contradiction:

Improvenumber of color fieldsVSAvoidproduction cost

Core Design Contradiction:

Quantity of substanceVSEase of manufacture

Solution Approach 1:

The patent merges the third color field with the first and second color fields to create two composite color fields. Each composite color field contains a combination of at least two different color image optical stimuli, allowing full color image formation with only two displayed fields instead of three, thereby reducing the required displaying frequency and production cost

Inventive Principle:

Principle #5Merging (Combining)

2Quantity of substance

If high displaying frequency of 180 Hz is used, then full color image can be formed with three primary color fields, but color break-up occurs

Engineering Contradiction:

Improvenumber of color fieldsVSAvoidcolor break-up

Core Design Contradiction:

Quantity of substanceVSObject-affected harmful factors

Solution Approach 1:

By merging color fields to reduce the total number of displayed fields from three to two, the patent reduces the temporal frequency required for full color image formation. This lower frequency reduces the persistence of vision artifacts and color break-up effects that occur at high frequencies

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent applies different color image optical stimuli to different regions or aspects of the display within each color field. Each color field is composed of combinations of color stimuli tailored to specific display requirements, allowing optimized color rendering at lower frequencies without uniform color distribution

Inventive Principle:

Principle #3Local quality

3Speed

If fast-response liquid crystal mode is used, then high displaying frequency can be achieved, but production cost increases

Engineering Contradiction:

Improveresponse timeVSAvoidproduction cost

Core Design Contradiction:

SpeedVSEase of manufacture

Solution Approach 1:

The patent reduces the required response time by merging color fields, which halves the number of fields that need to be displayed per second. This relaxation of the response time requirement allows the use of commercially available liquid crystal modes such as TN, VA, or IPS instead of expensive fast-response modes

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

This approach reduces production costs by eliminating the need for fast-response liquid crystal modes, enhances color rendering, and suppresses color break-up by decreasing color contrast between fields, while maintaining acceptable image quality at lower display frequencies.

Implementation Method 1

controlling the colors of a multi-primary backlight module and changing pixel transmittance or reflectance of a light valve element (e.g., an LCD panel)

Methodology Applied

Scientific EffectElectro-optical conversion: Electro-Optic Effects

Implementation Method 2

sequentially displaying monochromatic fields of different colors so that, through time integration by the human visual system, or better known as persistence of vision, the monochromatic fields are visually overlapped to form a full color image according to the principle of additive color mixing

Methodology Applied

Scientific EffectPersistence of vision:

Data Source

PatentUS8698719B2Displaying method for field sequential color displays using two color fields

Publication Date: 2014.04.15 AU OPTRONICS CORP

AI summary

A displaying method for field sequential color displays using two color fields to produce a full color image is disclosed. The displaying method includes: providing a target full color image, displaying a first color field and displaying a second color field. The target full color image is formed by a first color image optical stimulus, a second color image optical stimulus and a third color image optical stimulus. The first color field displays the first color image optical stimulus and a first part of the third color image optical stimulus, while the second color field displays the second color image optical stimulus and a second part of the third color image optical stimulus, which compensates the shortage of the third color image optical stimulus in the first color field. The target full color image is generated by displaying the first and second color fields in sequence, so as to decrease the displaying frequency of field sequential color displays.