Backlight Diffusion Parameter Generation for Display Control

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Solution Overview

Problem

Existing display technologies face challenges in accurately modeling the complex nonlinear characteristics of backlight diffusion, which affects the quality of displayed images, especially in local dynamic dimming applications.

Innovation Solution

A method for generating backlight diffusion parameters, involving the measurement and preprocessing of illumination diffusion data, function fitting to obtain a point spread function, and storing a lookup table with diffusion distance bonding points, slopes, and corresponding brightness values, to enable accurate interpolation and compensation calculations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If local dynamic dimming is used to reduce power consumption and improve contrast ratio, then energy efficiency and image quality are improved, but accurate modeling of backlight diffusion becomes more difficult

Engineering Contradiction:

Improvepower consumptionVSAvoidbacklight diffusion modeling complexity

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The backlight module is divided into multiple light emitting regions, and the diffusion process is segmented into measurable illumination diffusion data points. This segmentation allows complex nonlinear diffusion characteristics to be broken down into discrete, measurable segments that can be modeled systematically through lookup tables and interpolation calculations.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent transforms the complex nonlinear diffusion modeling problem into a parameter-based solution by measuring illumination diffusion data at different distances and brightness levels. These measured parameters are then stored in lookup tables, converting the continuous nonlinear diffusion process into discrete parameter sets that can be efficiently queried and interpolated during operation.

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If complex nonlinear backlight diffusion characteristics are accurately modeled, then image quality and contrast ratio are improved, but calculation complexity and processing time increase

Engineering Contradiction:

Improvebacklight diffusion modeling precisionVSAvoidcalculation time

Core Design Contradiction:

Manufacturing precisionVSLoss of time

Solution Approach 1:

The patent performs preliminary measurements of illumination diffusion data and pre-calculates the diffusion characteristics before actual display operation. The measured data is pre-processed, fitted to functions, and stored in lookup tables in advance. During operation, the system only needs to perform simple interpolation and compensation calculations based on the pre-prepared lookup tables, dramatically reducing real-time computation time while maintaining high precision.

Inventive Principle:

Principle #10Preliminary action

3Illumination intensity

If full-brightness backlight is used to maintain image quality, then display performance is improved, but power consumption increases

Engineering Contradiction:

Improvedisplay brightnessVSAvoidpower consumption

Core Design Contradiction:

Illumination intensityVSUse of energy by moving object

Solution Approach 1:

The patent implements a feedback mechanism where the measured illumination diffusion data is used to calculate compensation values for each pixel. The system continuously queries the lookup tables based on actual diffusion characteristics and adjusts the backlight and display signals accordingly. This feedback loop ensures that local dimming maintains image quality comparable to full-brightness display while significantly reducing overall power consumption by dimming only the necessary regions.

Inventive Principle:

Principle #23Feedback

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 allows for precise calculation of equivalent backlight brightness for each pixel, resulting in improved image quality, reduced power consumption, and enhanced contrast ratio, comparable to full-brightness backlight displays.

Implementation Method 1

the light emitting plate includes a plurality of light emitting regions

Methodology Applied

Scientific EffectLight emitting: Light Emitting Diode

Implementation Method 2

an optical membrane group located between the light emitting plate and the display panel

Methodology Applied

Scientific EffectLight diffusion: Diffusion

Data Source

PatentUS12334028B2Backlight diffusion parameter generation method, display control method and apparatus, and display apparatus

Publication Date: 2025.06.17 BOE TECHNOLOGY GROUP CO LTD

AI summary

Disclosed is a backlight diffusion parameter generation method, including: selecting and measuring illumination diffusion data of at least one of multiple light emitting regions, wherein the illumination diffusion data includes brightness data of multiple pixels on a display panel and distance data between positions corresponding to multiple pixels and a position where an illuminated light emitting region is located when only one light emitting region is illuminated; preprocessing the illumination diffusion data to obtain an effective pixel; performing function fitting according to data corresponding to multiple effective pixels to obtain a point spread function representing a relationship between diffusion brightness and a diffusion distance; storing a backlight diffusion parameter lookup table, which includes multiple diffusion distance bonding points and diffusion brightness corresponding to each of the diffusion distance bonding points, and also includes a diffusion slope between two adjacent diffusion distance bonding points.