Backlight Intensity Calculation Using Diffusion Weight Lookup Table

Solution Overview

Problem

Existing liquid crystal display (LCD) technologies face challenges in achieving optimal contrast and reducing power consumption, as the brightness of the backlight module remains constant, leading to inefficient power usage and low contrast due to uniform brightness across all regions, even when displaying images with varying brightness levels.

Innovation Solution

A method is introduced to dynamically adjust the backlight intensity by dividing image data into sets corresponding to groups of pixels and backlight blocks, calculating the backlight intensity for each block, and using a diffusion weight lookup table to account for light diffusion across the display panel, allowing for localized dimming and improved contrast.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If uniform backlight is provided across the entire display panel, then the manufacturing and control are simple, but the power consumption is high and the contrast is low when displaying images with varying brightness levels

Engineering Contradiction:

Improvebacklight module simplicityVSAvoidpower consumption

Core Design Contradiction:

Ease of manufactureVSUse of energy by moving object

Solution Approach 1:

The backlight module is divided into multiple independently controllable backlight blocks (e.g., 10 first backlight blocks and 10 second backlight blocks), allowing different regions to have different brightness levels. This segmentation enables local dimming where only necessary regions are illuminated at high brightness, reducing overall power consumption while maintaining manufacturing feasibility through modular design.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different backlight blocks are assigned different brightness characteristics based on the local requirements of the displayed image content. Regions corresponding to dark image areas use lower brightness backlight blocks, while regions corresponding to bright areas use higher brightness blocks, optimizing power consumption locally without affecting the entire display panel.

Inventive Principle:

Principle #3Local quality

2Device complexity

If uniform backlight is provided across the entire display panel, then the control mechanism is simple, but the contrast is low when displaying images with varying brightness levels

Engineering Contradiction:

Improvebacklight control complexityVSAvoiddisplay contrast

Core Design Contradiction:

Device complexityVSIllumination intensity

Solution Approach 1:

The backlight module is divided into multiple independently controllable backlight blocks (e.g., 10 first backlight blocks and 10 second backlight blocks), allowing different regions to have different brightness levels. This segmentation enables local dimming where only necessary regions are illuminated at high brightness, reducing overall power consumption while maintaining manufacturing feasibility through modular design.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different backlight blocks are assigned different brightness characteristics based on the local requirements of the displayed image content. Regions corresponding to dark image areas use lower brightness backlight blocks, while regions corresponding to bright areas use higher brightness blocks, optimizing power consumption locally without affecting the entire display panel.

Inventive Principle:

Principle #3Local quality

3Measurement precision

If backlight intensity is adjusted for each pixel based on light diffusion, then the display accuracy and contrast are improved, but the calculation complexity and processing time increase

Engineering Contradiction:

Improvebacklight intensity accuracyVSAvoidcalculation complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

A light diffusion weight lookup table is pre-calculated and stored, containing diffusion weights for various distances from backlight blocks to pixels. During display operation, the system only needs to query this pre-computed table based on pixel positions, avoiding complex real-time light diffusion calculations and significantly reducing processing complexity while maintaining high precision.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Instead of performing complex physical light diffusion calculations for each pixel, the patent uses a pre-computed lookup table that copies the results of these calculations. This table-based approach replaces computationally intensive operations with simple memory access and multiplication, maintaining accuracy while reducing complexity.

Inventive Principle:

Principle #26Copying

Data Source

PatentUS11289035B2Methods for obtaining backlight intensity and compensation value, and display device

Publication Date: 2022.03.29 BEIJING BOE OPTOELECTRONCIS TECH CO LTD

AI summary

A method for obtaining a backlight intensity may improving data processing speed of a display device. The method includes: dividing image data into N sets of data; calculating a backlight intensity of each backlight block according to a corresponding set of data; for each group of pixels, calculating a backlight intensity corresponding to a first pixel according to a backlight intensity of each effective backlight block corresponding to the first pixel and a backlight diffusion weight of the effective backlight block corresponding to the first pixel; calculating backlight intensities corresponding to second to Mth pixels in the Tth group of pixels according to the backlight intensities corresponding to first pixels in the Tth group of pixels and a (T+1)th group of pixels; and for a Nth group of pixels, setting the backlight intensity corresponding to the first pixel as backlight intensities corresponding to second to Mth pixels.