Field Sequential Color LCD Reducing Color Break-Up

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Field sequential color (FSC) technology in LCD devices experiences color break-up due to light leakage, which reduces contrast and display quality, and existing solutions only partially address this issue while increasing power consumption.

Innovation Solution

A display method combining dynamic contrast technology with FSC, where control signals are generated to modulate backlight and liquid crystal transmittance in sub-frames, reducing color break-up by dividing the screen into regions and adjusting backlight and LC control signals to enhance contrast and reduce power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If FSC technology is used to reduce manufacturing cost and simplify structure, then color filters and sub-pixels are eliminated, but color break-up occurs due to light leakage

Engineering Contradiction:

Improvemanufacturing cost and structure complexityVSAvoidcolor break-up

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The display frame is divided into multiple sub-frames, with each sub-frame displaying a different primary color (red, green, blue) sequentially. The screen is also divided into multiple display regions, allowing independent contrast control for each region. This segmentation enables precise control of light leakage in different areas and colors, reducing color break-up while maintaining the advantages of FSC technology.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The backlight and liquid crystal layers are controlled in periodic cycles corresponding to different color sub-frames. During each color sub-frame period, the backlight intensity and liquid crystal transmittance are dynamically adjusted according to the specific color being displayed, creating a periodic control pattern that minimizes light leakage and color break-up across different colors.

Inventive Principle:

Principle #19Periodic action

2Object-affected harmful factors

If dynamic contrast control is applied to reduce color break-up, then contrast is improved, but power consumption increases

Engineering Contradiction:

Improvecolor break-up and contrastVSAvoidpower consumption

Core Design Contradiction:

Object-affected harmful factorsVSUse of energy by moving object

Solution Approach 1:

Different display regions are assigned different contrast levels based on their specific requirements. Regions prone to color break-up receive higher contrast control, while other regions maintain lower contrast to reduce power consumption. This local quality approach optimizes the balance between contrast improvement and power consumption by applying different control strategies to different areas.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The backlight intensity and liquid crystal transmittance parameters are dynamically changed according to the displayed color and region. By adjusting these parameters optimally for each color sub-frame and display region, the system achieves effective color break-up reduction while minimizing unnecessary power consumption that would result from uniform high-contrast control across the entire screen.

Inventive Principle:

Principle #35Parameter changes

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 effectively reduces color break-up, enhances contrast, and lowers power consumption by optimizing backlight and liquid crystal control in LCD devices, improving overall display quality.

Implementation Method 1

each of the sub-pixels requires a field effect transistor (TFT) to control electric field intensity thereof

Methodology Applied

Scientific EffectLiquid crystal effect: Liquid Crystals

Implementation Method 2

control electric field intensity thereof

Methodology Applied

Scientific EffectElectric field effect: Electric Field

Implementation Method 3

each pixel in an LCD module thereof is composed of three sub-pixels, and each of the sub-pixels requires a field effect transistor (TFT) to control electric field intensity thereof

Methodology Applied

Scientific EffectField effect transistor operation:

Data Source

PatentUS8184087B2Display method for LCD device with reduced color break-up

Publication Date: 2012.05.22 AU OPTRONICS CORP

AI summary

The present invention provides a display method for an LCD device with reduced color break-up, comprising the following steps: generating a control signal for each sub-frame, and displaying the sub-frames successively. The present invention generates, according to brightness of a screen to be displayed, second backlight control signals and second LC control signals for each display region in the each sub-frame and then, according to the second backlight control signals and the second LC control signals, displays a chromatic sub-frame and a plurality of monochromatic sub-frames successively so that the screen to be displayed can be viewed through human vision. The present invention can not only facilitate reducing color break-up (CBU) of the LCD device, but also can contributes to the LCD device advantaged by high contrast, high color saturation, low power consumption and low manufacturing costs.