Display Control System for Global and Local Dimming

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Solution Overview

Problem

Current display control systems cannot effectively implement both global dimming control and local dimming control without significant modifications to the existing system, leading to issues like leakage light in low-illuminance environments and inefficient power usage.

Innovation Solution

A display control system that includes a processing device for calculating global dimming information and performing color correction, and a circuit device with a dimming control circuit to calculate local dimming information and a light source control circuit to manage backlight dimming, allowing for simultaneous global and local dimming control without altering the existing system.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If global dimming control is performed based on external light sensor detection, then power consumption is reduced and visibility is improved, but leakage light occurs in low-illuminance environments and local contrast is insufficient

Engineering Contradiction:

Improvebacklight luminanceVSAvoidleakage light

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The backlight is divided into multiple independently controllable light source regions (first light source region and second light source region). The dimming control circuit performs separate dimming control on each region based on image data luminance distribution, allowing local contrast enhancement without the leakage light problems of global dimming.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different dimming control strategies are applied to different light source regions based on their corresponding image data characteristics. High-luminance regions receive different dimming treatment than low-luminance regions, optimizing both power consumption and image quality locally rather than applying uniform global dimming.

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If local dimming control is performed on each light source without system integration, then local contrast is improved, but device complexity increases significantly

Engineering Contradiction:

Improvelocal dimming control capabilityVSAvoidcontrol system complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The dimming control circuit performs multiple functions: it analyzes image data luminance distribution, determines dimming ratios for different light source regions, and executes dimming control. This integrated approach achieves local dimming capability without requiring separate complex control systems for each light source.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The global dimming control function and local dimming control function are merged into a unified control system. The processing device performs global dimming based on external light sensors, while the dimming control circuit performs local dimming based on image data, with both functions coordinated through the same control architecture.

Inventive Principle:

Principle #5Merging (Combining)

3Productivity

If both global dimming control and local dimming control are implemented simultaneously, then image contrast and power efficiency are optimized, but the existing system requires significant modifications

Engineering Contradiction:

Improvedisplay efficiencyVSAvoidsystem modification complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The system dynamically adjusts dimming control strategy based on operating conditions. The processing device performs global dimming control based on external light sensor data, while the dimming control circuit performs local dimming control based on image data luminance distribution. Both controls are dynamically coordinated without requiring fundamental system redesign.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The dimming control circuit acts as an intermediary between the processing device (global dimming) and the light sources. It receives global dimming information from the processing device and image data, then generates region-specific dimming control signals that coordinate both global and local dimming functions.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS12260832B2Display control system, circuit device, and display system

Publication Date: 2025.03.25 SEIKO EPSON CORP

AI summary

A display control system according to an embodiment includes: a processing device configured to calculate global dimming information for global dimming control on a backlight of a display device, and perform color correction on image data based on the global dimming information; and a circuit device configured to perform display control on the display device based on the image data from the processing device. The circuit device includes a dimming control circuit that calculates, based on the image data and the global dimming information from the processing device, local dimming information for local dimming control on the backlight, and a light source control circuit that performs light source control on the backlight based on the local dimming information from the dimming control circuit.