Field Sequential Color Display with White Subpixels

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Solution Overview

Problem

Field sequential color displays experience color break-up phenomena due to the rapid switching of red, green, and blue light sources, which is not efficiently addressed by increasing the frame rate, given the limitations of liquid crystal molecule response time.

Innovation Solution

A field sequential color display design incorporating a display panel with first and white color unit regions, each with specific filter patterns, and a backlight module with sequentially switched white, second color, and third color light sources, allowing light to pass through the appropriate regions to reduce color break-up without increasing the frame rate.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If the frame rate is increased to reduce color break-up, then the color break-up phenomenon is improved, but the response time requirement of liquid crystal molecules becomes more difficult to meet

Engineering Contradiction:

Improvecolor break-up phenomenonVSAvoidresponse time of liquid crystal molecules

Core Design Contradiction:

Object-affected harmful factorsVSDuration of action of moving object

Solution Approach 1:

The pixel array is divided into multiple sub-pixels with different color filter patterns (first color filter pattern and second color filter pattern). Each sub-pixel type responds to specific color light sources, allowing the display to show different colors at different spatial locations simultaneously during the same time period, thus eliminating color break-up without requiring higher frame rates.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the pixel array are assigned different color filter patterns and correspond to different color light sources. The first color unit regions use first color filter patterns for first color light sources, while second color unit regions use second color filter patterns for second color light sources, creating local optimization that prevents color break-up.

Inventive Principle:

Principle #3Local quality

2Illumination intensity

If a color filter layer is used in LCD panels, then full color display is achieved, but the utility rate of the light source decreases

Engineering Contradiction:

Improvecolor display capabilityVSAvoidlight source utility rate

Core Design Contradiction:

Illumination intensityVSLoss of energy

Solution Approach 1:

The backlight module sequentially switches between different color light sources (first color light source, second color light source, third color light source) in periodic cycles. Each color light source is turned on separately for specific time periods, allowing the corresponding color-filtered light to pass through the display medium without being blocked by other color filters, thereby improving light source utilization efficiency while maintaining full color display capability.

Inventive Principle:

Principle #19Periodic 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

This design effectively reduces color break-up in field sequential color displays at conventional frame rates, improving display quality and reducing power consumption and overall costs by optimizing the area ratio of filter patterns and light sources.

Implementation Method 1

The filter layer is disposed on the second substrate, and has a first color filter pattern and a white color filter pattern

Methodology Applied

Scientific EffectOptical filtering: Filter (optical)

Implementation Method 2

The display medium is located between the first substrate and the second substrate

Methodology Applied

Scientific EffectElectro-optic effect: Electro-Optic Effects

Implementation Method 3

The backlight module includes a white light source, a second color light source, and a third color light source, wherein the white light source, the second color light source, and the third color light source are switched in sequence

Methodology Applied

Scientific EffectLight emission: Light

Data Source

PatentUS9142165B2Field sequential color display and driving method thereof

Publication Date: 2015.09.22 AU OPTRONICS CORP

AI summary

A field sequential color display having a display panel and a backlight module is provided. The panel includes a plurality of unit regions, each having a first color unit region and a white color unit region. The panel includes a first substrate, a second substrate, a filter layer and a display medium. The first substrate has a pixel array. The second substrate is disposed opposite to the first substrate. The filter layer is disposed on the second substrate and has a first color filter pattern disposed within the first color unit regions and a white color filter pattern disposed within the white color unit regions. The display medium is between the first and second substrate. The backlight module is disposed at a side of the display panel and has a white light source, a second color light source and a third color light source which are switched in sequence.