Micro LED Gamma Control for Color Temperature Stability

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Solution Overview

Problem

Micro LED displays experience significant color temperature changes due to lattice stress and temperature variations, leading to inconsistent display quality and user viewing experience.

Innovation Solution

A display apparatus and method that adjusts drive current and grayscale values based on temperature and brightness, using a control module, gamma module, current source module, and PWM module to stabilize light emission wavelength and brightness, employing compensation or gain corrections to mitigate color temperature changes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If drive current is increased to improve brightness, then brightness is improved, but light emission wavelength shifts toward blue (shorter wavelength) due to crystal stress

Engineering Contradiction:

ImprovebrightnessVSAvoidlight emission wavelength

Core Design Contradiction:

Illumination intensityVSTemperature

Solution Approach 1:

The patent implements a feedback mechanism where the control module continuously monitors the light emission wavelength of the LED and adjusts the drive current dynamically. When wavelength deviation is detected, the system automatically compensates by modifying the drive current, creating a closed-loop control system that maintains wavelength stability while preserving brightness

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent changes the drive current parameter dynamically based on detected wavelength deviations. By adjusting this electrical parameter in real-time, the system compensates for wavelength shifts caused by crystal stress, thereby maintaining display consistency without sacrificing brightness output

Inventive Principle:

Principle #35Parameter changes

2Temperature

If temperature increases, then light emission wavelength shifts toward red (longer wavelength), but display picture consistency deteriorates

Engineering Contradiction:

ImprovetemperatureVSAvoiddisplay picture consistency

Core Design Contradiction:

TemperatureVSStability of the object's composition

Solution Approach 1:

The control module continuously monitors temperature changes and their effect on light emission wavelength, then dynamically adjusts drive current to compensate. This feedback loop detects temperature-induced wavelength shifts and counteracts them, maintaining display picture consistency despite temperature variations

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system takes preliminary anti-action by pre-adjusting the drive current in response to detected temperature changes or wavelength deviations. This proactive compensation prevents wavelength drift before it significantly impacts display consistency, rather than merely reacting after the problem occurs

Inventive Principle:

Principle #9Preliminary anti-action

3Ease of manufacture

If crystal stress is present due to lattice constants differences, then LED structure is formed, but light emission wavelength becomes unstable

Engineering Contradiction:

ImproveLED structure formationVSAvoidlight emission wavelength stability

Core Design Contradiction:

Ease of manufactureVSStability of the object's composition

Solution Approach 1:

The patent uses feedback control to monitor light emission wavelength and detect shifts caused by crystal stress. The control module then adjusts drive current parameters to compensate for these stress-induced wavelength variations, maintaining stability despite the inherent crystal lattice differences in the LED structure

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system performs self-service by automatically detecting and compensating for wavelength instability caused by crystal stress without external intervention. The control module autonomously monitors wavelength deviations and adjusts drive current to maintain stability, making the system self-correcting

Inventive Principle:

Principle #25Self-service

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

Stabilizes light emission wavelength and brightness, reducing color temperature fluctuations and improving display picture consistency.

Implementation Method 1

Under impact of the lattice stress, a larger drive current indicates a blue shift of a light emission peak of the LED, that is, movement of a light emission wavelength of the LED toward a short wavelength direction; and a higher temperature indicates a red shift of the light emission peak of the LED

Methodology Applied

Scientific EffectLight emission wavelength shift:

Data Source

PatentUS20260018098A1Display apparatus, picture adjustment method, and device

Publication Date: 2026.01.15 HUAWEI TECH CO LTD

AI summary

A display apparatus, a picture adjustment method, and a device are disclosed. The display apparatus includes a display panel, a control module, a gamma module, a current source module, and a pulse width modulation (PWM) module. The control module sends a present temperature value, a present current value, and a present brightness value to the gamma module. The gamma module determines a target current value based on the present current value and the present temperature value, and sends the target current value to the current source module. The gamma module determines a present grayscale value based on the present temperature value and the present brightness value. The gamma module determines a target grayscale value based on the present grayscale value and the present temperature value, and sends the target grayscale value to the PWM module.