Backlight Partition Control for Display Afterimage Reduction
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Solution Overview
Problem
Conventional display devices experience afterimages and instability when displaying dynamic pictures due to response times and human visual properties, with existing solutions like frequency multiplication reducing the scan period of the backlight and making systems unstable.
Innovation Solution
A display device comprising a display panel, a backlight unit, and a time schedule controller that divides the backlight into areas with and without brightness, with the controller outputting corresponding backlight data after a delay time based on dither values sampled from images, thereby identifying and alleviating afterimages without increasing instability risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If frequency multiplication is used to improve afterimages of dynamic pictures, then afterimage reduction is achieved, but the scan period of backlight is reduced making the display system unstable
Solution Approach 1:
The backlight unit is divided into multiple independently controllable backlight partition areas, allowing selective brightness control for different regions based on their specific afterimage needs, rather than applying frequency multiplication globally to the entire backlight system
Solution Approach 2:
Different backlight partition areas are controlled with different brightness levels based on local image characteristics (dither values), enabling afterimage reduction only in areas where it is needed while maintaining normal operation elsewhere, avoiding system-wide instability
2Object-affected harmful factors
If the scan period of backlight is reduced to improve afterimages, then afterimage reduction is achieved, but the display system becomes unstable
Solution Approach 1:
The controller pre-calculates dither values for image points and determines which backlight partition areas require brightness suppression before the actual display cycle begins, allowing the backlight to operate at normal scan periods without rushed timing
Solution Approach 2:
The time schedule controller acts as an intermediary between the image data and backlight unit, using dither value analysis to mediate the timing and brightness of backlight illumination, eliminating the need for reduced scan periods
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
The solution effectively relieves the tailing phenomenon of dynamic images by transmitting no brightness to areas with high dither values, eliminating the need for frequency multiplication and maintaining display stability.
Implementation Method 1
the backlight unit corresponds to the display panel and is configured to control brightness in different backlight partition areas according to backlight data
Implementation Method 2
the time schedule controller is connected to the display panel and the backlight unit and is configured to output the corresponding backlight data according to a plurality of dither values sampled from a plurality of points on the images
Data Source
AI summary
A display device and a controlling method thereof are provided. The display device includes a display panel, a backlight unit, and a time schedule controller. The display panel is configured to display images. Areas where afterimages of dynamic images occur are identified according to comparison results of dither values. Tailing phenomenon of the dynamic images may be relieved by transmitting backlight data without brightness to a second backlight sub-area corresponding to where the afterimages occur. Furthermore, because frequency multiplication is not applied, risks of display instability will not increase.