Display Device Backlight Luminance Control for Refresh Rate Switching
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Solution Overview
Problem
Existing display devices experience deterioration in display quality due to luminance changes when switching refresh rates, leading to flickering that is visually recognized by the human eye.
Innovation Solution
A display device with a controller that adjusts the backlight's luminance at refresh rate switching to ensure the luminance change of the display panel falls within a predetermined range, thereby suppressing flickering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the refresh rate is switched to save power consumption, then power consumption is reduced, but luminance change occurs causing flicker
Solution Approach 1:
The patent changes the luminance parameter of the backlight in response to refresh rate switching. When the refresh rate changes, the controller adjusts the backlight luminance to a predetermined value that compensates for the luminance change caused by the refresh rate switch, thereby maintaining stable display quality while enabling power saving through refresh rate variation.
2Use of energy by moving object
If pause driving is used to save power, then power consumption is reduced, but flicker occurs due to pause frame period changes
Solution Approach 1:
The patent dynamically adjusts the backlight luminance parameter based on the pause frame period changes. When pause driving is implemented with varying pause periods, the controller modifies the backlight luminance to compensate for the resulting display luminance fluctuations, thereby eliminating flicker while maintaining the power saving benefits of pause driving.
Data Source
AI summary
A display device includes a display panel including a liquid crystal panel and a backlight disposed behind the liquid crystal panel, and a controller configured to control luminance of the backlight. The controller is configured to increase or decrease the luminance of the backlight at a time of switching a refresh rate when an image is displayed on the display panel in accordance with an image signal in such a manner that a change in luminance of the display panel before and after the switching with respect to an image signal having the same gray scale falls within a predetermined range.