Backlight Luminance Control via Saturation Detection

Solution Overview

Problem

Conventional RGBW-type display devices face challenges in reducing power consumption while maintaining display quality, especially when displaying high-saturation images, as reducing backlight luminance significantly deteriorates image quality.

Innovation Solution

A display device with an image display unit comprising red, green, and blue sub-pixels, a signal correction unit that calculates saturation and value based on input color information, and a light source control unit that adjusts luminance to optimize light source usage, allowing for reduced power consumption without compromising image quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by stationary object

If the luminance of the backlight is reduced to reduce power consumption, then power consumption is reduced, but display quality is remarkably deteriorated

Engineering Contradiction:

Improvepower consumptionVSAvoiddisplay quality

Core Design Contradiction:

Use of energy by stationary objectVSIllumination intensity

Solution Approach 1:

The patent applies local quality by differentiating the treatment of different color channels. Specifically, the saturation detection unit detects saturation for each color (R, G, B), and the luminance adjustment is applied selectively based on the detected saturation level of each color. High-saturation colors receive different luminance adjustment than low-saturation colors, allowing power consumption reduction while preserving display quality for saturated regions.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the luminance parameter dynamically based on the saturation parameter. The luminance adjustment unit adjusts the luminance of the backlight according to the saturation level detected in the image, creating a dynamic parameter change that resolves the contradiction between power consumption and display quality.

Inventive Principle:

Principle #35Parameter changes

2Use of energy by stationary object

If the luminance of the backlight is reduced to reduce power consumption, then power consumption is reduced, but the entire power consumption of the display device cannot be reduced effectively

Engineering Contradiction:

Improvepower consumptionVSAvoidpower consumption reduction effectiveness

Core Design Contradiction:

Use of energy by stationary objectVSProductivity

Solution Approach 1:

The patent applies local quality by differentiating the treatment of different color channels. Specifically, the saturation detection unit detects saturation for each color (R, G, B), and the luminance adjustment is applied selectively based on the detected saturation level of each color. High-saturation colors receive different luminance adjustment than low-saturation colors, allowing power consumption reduction while preserving display quality for saturated regions.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the luminance parameter dynamically based on the saturation parameter. The luminance adjustment unit adjusts the luminance of the backlight according to the saturation level detected in the image, creating a dynamic parameter change that resolves the contradiction between power consumption and display quality.

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If expansion coefficients are kept the same for colors with the same saturation regardless of hue, then device complexity is reduced, but display quality deteriorates for colors deviated from the hue region

Engineering Contradiction:

Improveexpansion coefficient managementVSAvoiddisplay quality

Core Design Contradiction:

Device complexityVSIllumination intensity

Solution Approach 1:

The patent applies local quality by differentiating the treatment of different color channels. Specifically, the saturation detection unit detects saturation for each color (R, G, B), and the luminance adjustment is applied selectively based on the detected saturation level of each color. High-saturation colors receive different luminance adjustment than low-saturation colors, allowing power consumption reduction while preserving display quality for saturated regions.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the luminance parameter dynamically based on the saturation parameter. The luminance adjustment unit adjusts the luminance of the backlight according to the saturation level detected in the image, creating a dynamic parameter change that resolves the contradiction between power consumption and display quality.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9613571B2Display device, method for driving display device, and electronic apparatus

Publication Date: 2017.04.04 MAGNOLIA WHITE CORP

AI summary

A display device includes: an image display unit in an image display region, the image display unit including a plurality of main pixels each including sub-pixels; a light source portion that irradiates the image display region; a signal correction unit that calculates saturation and value of the main pixels based on first color information to be displayed on a predetermined pixel, the first color information being obtained based on an input video signal, and generates second color information by correcting the first color information based on the calculated saturation and value; a signal generation unit that calculates the saturation and the value of the main pixels based on the second color information, and generates a signal for determining light source luminance of the light source based on the calculated saturation and value; and a light source control unit that controls luminance of the light source based on the signal.