Display Controllers Sharing Block Values for Local Dimming
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Solution Overview
Problem
Display devices using local dimming methods with multiple controllers can create visible boundaries between pixel blocks driven by different controllers, degrading image quality and user experience.
Innovation Solution
A display device with multiple controllers that share and generate block representative value information to synchronize light profile calculations across all pixel blocks, ensuring consistent image data compensation and minimizing perceived boundaries between controller-driven areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If local dimming is implemented with multiple controllers, then power consumption is reduced and contrast ratio is improved, but visible boundaries appear between pixel blocks driven by different controllers
Solution Approach 1:
The patent merges the block representative value information from multiple controllers into a unified light profile calculation. Each controller generates block representative values for its controlled pixel blocks, and these values are shared across all controllers to generate a common light profile information that is used by all controllers for image data compensation, ensuring consistent dimming across controller boundaries.
Solution Approach 2:
The patent introduces block representative value information as an intermediary that mediates between multiple controllers and the final image output. This intermediary data structure allows controllers to coordinate their local dimming operations without directly controlling each other, enabling seamless collaboration across controller boundaries.
2Illumination intensity
If local dimming is implemented with multiple controllers, then backlight luminance control is improved, but boundaries between controller-driven pixel blocks become visible
Solution Approach 1:
The patent combines block representative value information from all controllers to generate a unified light profile that governs backlight luminance across the entire display. This merged information ensures that luminance transitions are smooth and consistent across controller boundaries, eliminating visible boundaries while maintaining precise backlight control.
Solution Approach 2:
The patent maintains local quality control by allowing each controller to generate block representative values based on its local pixel block characteristics, while simultaneously ensuring global consistency through the shared light profile information that coordinates luminance across all controllers.
3Measurement precision
If multiple controllers are used for local dimming, then control precision is improved, but synchronization between controllers becomes complex
Solution Approach 1:
The patent uses block representative value information as an intermediary that simplifies controller synchronization. Instead of requiring complex direct communication and coordination between controllers, each controller independently generates block representative values and receives others' values through a standardized interface, automatically achieving synchronization through the shared light profile calculation.
Data Source
AI summary
A display device includes a backlight unit including a plurality of light emitting blocks, a first controller configured to generate first block representative value information for first pixel blocks based on first image data, and a second controller configured to generate second block representative value information for second pixel blocks based on second image data. The first controller receives the second block representative value information from the second controller, and the second controller receives the first block representative value information from the first controller. The first and second controllers generate duty information for the plurality of light emitting blocks based on the first and second block representative value information, and generate light profile information of the backlight unit. The first controller compensates the first image data based on the light profile information, and the second controller compensates the second image data based on the light profile information.