LED Display Sub-Pixel Grayscale Control for Color Shift Compensation

Solution Overview

Problem

LED display apparatuses experience color shift issues due to different grayscales leading to varying color purities among red, green, and blue LEDs, which affect chromaticity.

Innovation Solution

An electronic device with a control module that adjusts the grayscale values of adjacent sub-pixels to compensate for color shifts by converting input data into output data, specifically increasing the grayscale value of one sub-pixel to match the desired color tone.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If different driving currents are used to control grayscale values of LEDs, then the grayscale display capability is improved, but color shift problem occurs due to varying color purities

Engineering Contradiction:

Improvegrayscale display precisionVSAvoidcolor shift

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The patent changes the grayscale parameter of adjacent sub-pixels with different colors to compensate for color shift. Specifically, when a first sub-pixel with a first color and a second sub-pixel with a second color are adjacent, the control module adjusts the grayscale value of one sub-pixel based on the grayscale value of the other, thereby modifying the color purity parameter to maintain consistent chromaticity across different grayscale levels.

Inventive Principle:

Principle #35Parameter changes

2Illumination intensity

If the driving current of green LED increases to achieve higher grayscale, then the brightness is improved, but the color shifts toward higher purity green

Engineering Contradiction:

ImprovebrightnessVSAvoidcolor shift

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The patent adjusts the grayscale parameter of adjacent sub-pixels with different colors to compensate for color shift. Specifically, when a first sub-pixel with a first color and a second sub-pixel with a second color are adjacent, the control module adjusts the grayscale value of one sub-pixel based on the grayscale value of the other, thereby modifying the color purity parameter to maintain consistent chromaticity across different grayscale levels.

Inventive Principle:

Principle #35Parameter changes

3Illumination intensity

If the driving current of green LED decreases to achieve lower grayscale, then the brightness is reduced, but the color shifts toward reddish

Engineering Contradiction:

ImprovebrightnessVSAvoidcolor shift

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The patent adjusts the grayscale parameter of adjacent sub-pixels with different colors to compensate for color shift. Specifically, when a first sub-pixel with a first color and a second sub-pixel with a second color are adjacent, the control module adjusts the grayscale value of one sub-pixel based on the grayscale value of the other, thereby modifying the color purity parameter to maintain consistent chromaticity across different grayscale levels.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12394353B2Electronic device

Publication Date: 2025.08.19 INNOLUX CORP

AI summary

An electronic device includes a color module and a control module. The color module includes a first sub-pixel and a second sub-pixel. The first sub-pixel and the second sub-pixel are adjacent and have different colors. The control module is configured to convert an input data to an output data. The input data includes a first grayscale value of a first color. The output data includes the first grayscale value of the first color and a second grayscale value of a second color, and the first color and the second color are different. The first grayscale value of the output data is provided to the first sub-pixel, and the second grayscale value of the output data is provided to the second sub-pixel.