Local Dimming Backlight Control for Flicker-Free Moving Objects
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Solution Overview
Problem
Existing LCD displays experience screen flicker when objects move due to inadequate control over brightness adjustments in adjacent backlight areas, leading to inconsistent brightness.
Innovation Solution
A method and system that utilizes a timing controller to generate initial and updated duty cycles for target and adjacent backlight blocks, considering their weights and brightness impacts, to maintain consistent object brightness during movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If local dimming technology divides the backlight module into multiple backlight blocks to adjust brightness independently, then contrast and energy efficiency are improved, but screen flicker occurs when objects move between backlight blocks due to inadequate control over brightness adjustments
Solution Approach 1:
The patent implements a feedback mechanism where the timing controller continuously monitors the positions of moving objects and dynamically adjusts the duty cycles of adjacent backlight blocks. The controller calculates updated duty cycles based on initial duty cycles and weight values representing the influence of adjacent blocks, ensuring that brightness adjustments account for the spatial relationship between objects and backlight blocks. This closed-loop control prevents flicker by maintaining consistent perceived brightness as objects move across block boundaries.
Solution Approach 2:
The patent changes the duty cycle parameter of backlight blocks dynamically based on object position and movement. By adjusting the duty cycle (the ratio of ON time to total period) of adjacent backlight blocks according to calculated weight values, the system maintains appropriate brightness levels during object movement. This parameter adjustment ensures that when an object moves from one backlight block to another, the transition is smooth and flicker-free.
2Ease of operation
If the timing controller adjusts the brightness of the target backlight block independently without considering adjacent backlight blocks, then control simplicity is maintained, but brightness consistency deteriorates causing screen flicker
Solution Approach 1:
The patent segments the backlight control into distinct components: target backlight blocks and adjacent backlight blocks. Each backlight block can be controlled independently with its own duty cycle, maintaining the simplicity of individual block control. However, the system also establishes relationships between segments by calculating weight values that represent the influence of adjacent blocks on the target block, enabling coordinated adjustment that ensures brightness consistency across block boundaries.
Data Source
AI summary
The present invention discloses a display, including a backlight module and a timing controller. The backlight module includes a target backlight block and an adjacent backlight block, the adjacent backlight block is adjacent to the target backlight block. The timing controller is coupled to the backlight module, and is configured to generate an initial duty cycle of the target backlight block and an initial duty cycle of the adjacent backlight block according to an image frame, and generates an updated duty cycle of the target backlight block according to at least the initial duty cycle of the target backlight block, the initial duty cycle of the adjacent backlight block, a weight of the target backlight block, and a weight of the adjacent backlight block. The backlight module adjusts a brightness of the target backlight block according to the updated duty cycle.