Display Dimming Control Circuit Velocity-Based Backlight Adjustment
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Solution Overview
Problem
Current display technologies, such as LCDs, face limitations in improving contrast and power efficiency due to the need for constant backlight brightness, while OLEDs lack a backlight unit but require individual light control for dynamic dimming.
Innovation Solution
A display apparatus with a dimming control circuit that adjusts light output based on the velocity of content objects, using either a backlight unit or self-luminous display devices, to dynamically dim areas according to user input, such as touch or gesture commands, thereby optimizing power usage and contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the brightness of the backlight is constantly maintained to ensure clear visibility of displayed content, then the visibility is improved, but the power consumption increases
Solution Approach 1:
The patent implements dynamic backlight brightness adjustment by detecting the velocity of content objects and adapting the backlight intensity in real-time. When objects move quickly, the system increases brightness to maintain visibility; when objects are stationary or move slowly, the system reduces brightness to save power. This dynamic adaptation resolves the contradiction between maintaining constant visibility and reducing power consumption.
Solution Approach 2:
The system changes the brightness parameter of the backlight based on the velocity parameter of displayed content objects. By establishing a relationship between object velocity and required brightness level, the system optimizes power consumption while ensuring adequate visibility only when necessary, thus resolving the contradiction between constant brightness and variable power usage.
2Illumination intensity
If the backlight brightness is adjusted according to image content to improve contrast, then the contrast property is improved, but the system complexity increases
Solution Approach 1:
The patent applies local dimming by adjusting the backlight brightness in specific display regions corresponding to the location of content objects. Rather than uniformly adjusting the entire backlight, the system selectively modifies brightness in localized areas, improving contrast while minimizing the complexity increase compared to global dimming approaches.
Solution Approach 2:
The system employs feedback mechanisms by continuously monitoring the position and velocity of content objects, then using this information to adjust backlight brightness accordingly. This closed-loop control enables intelligent contrast optimization without requiring overly complex manual control systems, as the adjustment is automatically driven by content characteristics.
3Use of energy by moving object
If the backlight is dimmed to save power, then the power efficiency is improved, but the visibility of content decreases
Solution Approach 1:
The system dynamically adjusts backlight brightness based on the velocity of content objects. When objects are stationary or move slowly, the system dims the backlight to improve power efficiency. When objects move quickly, the system brightens the backlight to maintain visibility. This velocity-based dynamic adjustment resolves the contradiction between power efficiency and content visibility.
Solution Approach 2:
The system establishes a parameter relationship between object velocity and backlight brightness, changing the illumination intensity parameter in response to velocity variations. This enables the system to optimize power efficiency by reducing brightness only when object motion characteristics indicate that lower visibility is acceptable, thus resolving the contradiction between power savings and content visibility.
Data Source
AI summary
There is provided a dimming method of a display apparatus, including calculating a velocity of a content object that is displayed on the display apparatus, and adjusting the light output of a content object area at which the content object is displayed on the display apparatus or of an entire display area including the content object area, according to the velocity of the content object.