Field Sequential LCD Backlight Driving Method for Color Breakup Reduction

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Solution Overview

Problem

The color sequential method for LCDs suffers from color breakup, where color differences between the leading and trailing edges of moving objects reduce display quality due to the sequential switching of primary colors, causing vision persistence effects.

Innovation Solution

Increasing the frequency of switching red, green, and blue light sources by using a backlight module with three light sources, where each is turned on twice in a frame, and combining sub-frames to reduce the number of required intervals, allowing for higher frame rates and improved color display.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If three primary colors are sequentially switched in three time segments, then color sequential display is achieved, but color breakup occurs between moving object head and tail

Engineering Contradiction:

Improveframe rateVSAvoidcolor display quality

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The frame is divided into multiple sub-frames (first sub-frame, second sub-frame, third sub-frame) with different color sequences. By segmenting the display into multiple color sequence variations, the patent reduces color breakup while maintaining high frame rate capability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the display use different color sequencing patterns. Specifically, the first and second sub-frames use one color sequence while the third sub-frame uses a different sequence, allowing local optimization to reduce color breakup in moving objects

Inventive Principle:

Principle #3Local quality

2Device complexity

If color sequential method is used, then display structure is simplified, but color breakup reduces display quality

Engineering Contradiction:

Improvedisplay structureVSAvoiddisplay quality

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The patent implements periodic color sequence switching by dividing frames into sub-frames with alternating color sequences. This periodic variation in color display timing reduces the persistence of vision effect that causes color breakup, while maintaining the simplicity of the color sequential display structure

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent changes the temporal parameters of color display by introducing multiple sub-frames with different color sequences within a single frame. This parameter modification allows the system to reduce color breakup without adding physical display components

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 enhances image quality by reducing color breakup and increasing frame rate, ensuring that colors appear more stable and continuous, even when objects move across the display.

Implementation Method 1

three primary colors are sequentially switched within the time that humans percept the flicker of image to compose a color

Methodology Applied

Scientific EffectVision persistence effect:

Data Source

PatentUS8044925B2Method for driving field sequential LCD backlight

Publication Date: 2011.10.25 AU OPTRONICS CORP

AI summary

The present invention provides a method for driving a backlight module of a liquid crystal display. The backlight module includes three light sources, a first light source, a second light source, and a third light source, that illuminate different color light respectively. The method includes sequentially turning on the three light sources, wherein the first light source and the second light source are turned on twice and the third light source is turned on once.