Colored Backlight Segmentation for Display Color Gamut

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Solution Overview

Problem

Conventional display devices with white light backlight sources suffer from a reduced color gamut due to significant light filtering by color filter layers, which limits the range of colors that can be accurately displayed.

Innovation Solution

Implementing a display panel with a backlight module comprising multiple colored backlight sources synchronized with sub-pixels of the same color on the display substrate, ensuring that sub-pixels and corresponding backlight sources are turned on during the same time periods to avoid light filtering and enhance color gamut.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If white light backlight sources are used with color filter layers, then the display device can display multiple colors, but the color gamut is reduced due to significant light filtering

Engineering Contradiction:

Improvecolor display capabilityVSAvoidlight filtering loss

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The backlight module is segmented into multiple independent colored backlight sources (red, green, blue) instead of using a single white light source. Each colored backlight source corresponds to specific sub-pixels, allowing selective illumination without color filter loss. This segmentation enables the system to maintain color display versatility while eliminating the harmful light filtering effect.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the display panel are provided with different colored backlight sources according to the local color requirements of sub-pixels. Red sub-pixels receive red backlight, green sub-pixels receive green backlight, and blue sub-pixels receive blue backlight. This local quality approach ensures that each region receives optimally colored light without unnecessary filtering, resolving the contradiction between color display capability and light filtering loss.

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If color filter layers are used to filter light, then the display device can achieve color separation, but the luminance uniformity is reduced

Engineering Contradiction:

Improvecolor separation capabilityVSAvoidluminance uniformity

Core Design Contradiction:

Adaptability or versatilityVSIllumination intensity

Solution Approach 1:

The color filter layer is extracted and removed from the display structure. Instead of using a color filter layer to achieve color separation, the patent uses colored backlight sources that directly provide color-specific light to each sub-pixel region. This extraction eliminates the source of luminance loss while preserving color separation capability through the colored backlight illumination.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent converts the harmful effect of color filter light filtering into a beneficial direct colored illumination system. By replacing the indirect white light filtering process with direct colored backlight illumination, the system achieves both color separation and high luminance uniformity simultaneously, turning the previous harmful filtering mechanism into a beneficial direct light delivery approach.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Object-affected harmful factors

If multiple colored backlight sources are used, then the color gamut is increased, but the device complexity increases

Engineering Contradiction:

Improvecolor gamutVSAvoidbacklight module structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The backlight module is divided into multiple colored backlight source units (red, green, blue) that can be independently controlled. Each unit corresponds to specific sub-pixel regions, allowing precise control and optimization of color output. This segmentation approach achieves wide color gamut while maintaining manageable device complexity through modular, independent control of each colored backlight source.

Inventive Principle:

Principle #1Segmentation

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 increases the color gamut by preventing unnecessary light filtering, allowing for a broader range of colors to be displayed with improved luminance uniformity and display quality.

Implementation Method 1

the backlight module comprises a plurality of backlight sources having different colors

Methodology Applied

Scientific EffectLight emission from LED: Light Emitting Diode

Implementation Method 2

a red filter layer filters out non-red light in the white light in a region corresponding to the red sub-pixels, a green filter layer filters out non-green light in the white light in a region corresponding to the green sub-pixels, and a blue filter layer filters out non-blue light in the white light in a region corresponding to the blue sub-pixels

Methodology Applied

Scientific EffectOptical filtering: Filter (optical)

Data Source

PatentUS10217421B2Display panel, display device and display control method

Publication Date: 2019.02.26 BOE TECHNOLOGY GROUP CO LTD

AI summary

A display panel, a display device and a display control method are disclosed. The display panel comprises a backlight module and a display substrate, wherein the backlight module comprises a plurality of backlight sources having different colors, the display substrate comprises a plurality of pixels, and each of the pixels comprises a plurality of sub-pixels having different colors; sub-pixels of at least one color and backlight sources having the same color are configured to be turned-on during a same time period.