Display Module Source Driver Integration for CABC
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Solution Overview
Problem
Large-sized display devices without a timing controller face challenges in integrating image analysis results across multiple source drivers, leading to display quality deterioration and inability to effectively perform Content Adaptive Backlight Control (CABC) functions, which are essential for reducing power consumption.
Innovation Solution
A display module configuration with multiple source drivers, each equipped with analysis circuits to analyze video signals and output control signals for their respective regions, allowing integration of analysis results without a timing controller, enabling unified image control and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a timing controller is removed from large-sized display devices to reduce manufacturing costs and simplify structure, then device complexity and manufacturing cost are reduced, but image analysis integration across multiple source drivers deteriorates and display quality worsens
Solution Approach 1:
The patent merges the image analysis function into each source driver, combining previously separate functions (timing controller's image analysis and source driver's signal output) into a single integrated component. This eliminates the timing controller while maintaining image analysis capability across multiple regions through the master-source driver that receives and processes video signals independently.
2Ease of manufacture
If a timing controller is removed to reduce manufacturing costs, then manufacturing cost is reduced, but the ability to perform Content Adaptive Backlight Control (CABC) functions deteriorates
Solution Approach 1:
The patent extracts the essential CABC functionality from the timing controller and implements it within the source driver system. The master-source driver performs image analysis on the video signal and generates backlight control signals based on luminance characteristics, extracting only the necessary CABC capability while eliminating the need for a separate timing controller.
3Device complexity
If multiple source drivers are used for large-sized display devices without a timing controller, then device complexity is reduced, but integration of image analysis results across regions deteriorates
Solution Approach 1:
The patent segments the display device into multiple regions, each served by a dedicated source driver. The master-source driver receives the complete video signal and performs image analysis to generate region-specific control signals, while slave-source drivers receive only their regional video signals. This segmentation maintains functional independence while ensuring coordinated control through the master driver's comprehensive image analysis.
Data Source
AI summary
A display module of the present invention includes first through third source drivers (6-1 through 6-3) (i) which are provided for respective regions into which a display region is divided and (ii) each of which includes an analysis circuit and receives a video signal for a corresponding one of the regions but receives no video signal for the regions other than the corresponding one of the regions. The third source driver (6-3) supplies, to the first and second source drivers (6-1 and 6-2), gamma (γ) setting information (19) for generating a source signal to be outputted from each of the first and second source drivers (6-1 and 6-2). The first and second source drivers (6-1 and 6-2) output respective analysis results (5a and 5b) from the respective analysis circuits. The third source driver (6-3) outputs a PWM signal (14) for controlling the light irradiation section.