Input Gamma Dithering Control for LCD Backlight Fluctuations

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Solution Overview

Problem

Current image processing systems for flat panel displays, such as LCDs, experience undesired visual effects like luminance fluctuations when input gamma dithering is applied concurrently with dynamic backlight control, particularly when different scale values are used for successive frames.

Innovation Solution

Implementing a system that selectively enables or disables input gamma dithering based on changes in backlight illumination, ensuring dithering is only applied when the scale values remain constant, thereby preventing interactions with dynamic backlight control that cause visual distortions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If input gamma dithering is applied during dynamic backlight control, then image processing functionality is enhanced, but luminance fluctuations and visual distortions occur

Engineering Contradiction:

Improveimage processing functionalityVSAvoidluminance fluctuations

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The system dynamically adjusts the dithering operation based on backlight illumination changes. The processor monitors backlight scale values across frames and selectively enables or disables dithering accordingly, making the image processing system adaptive to changing display conditions rather than applying a fixed processing approach

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the operational parameter of the dithering block by modifying its enable/disable state based on detected backlight scale value changes. When the scale value changes between frames, the dithering parameter is switched off; when stable, dithering is enabled, thus adapting processing parameters to current display conditions

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If input gamma dithering is applied when scale values change, then bit depth processing is improved, but image quality deteriorates due to visual distortions

Engineering Contradiction:

Improvebit depth processingVSAvoidimage quality

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The system implements feedback by monitoring the backlight scale values from previous frames and using this information to control the dithering operation. The processor compares scale values across frames and uses this feedback to determine whether to enable or disable dithering, ensuring that processing decisions are based on actual display conditions

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system performs preliminary detection of scale value changes before applying dithering operations. By checking whether the scale value has changed between frames in advance, the system prevents problematic dithering applications before they can degrade image quality, rather than correcting issues after they occur

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS8203523B2Method and apparatus for selectively applying input gamma dithering

Publication Date: 2012.06.19 SAMSUNG DISPLAY CO LTD

AI summary

Display systems that employ input gamma dithering and dynamic backlight control. Embodiments relate to disabling input gamma dithering during periods when there is a change in the scale value by which image data is scaled due to dynamic backlight control. In this manner, input gamma dithering is selectively applied only during those times when data scaling due to dynamic backlight control is constant.