Backlight System Daisy Chain Matrix for Noise Reduction
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Solution Overview
Problem
Conventional backlight systems face challenges in efficiently driving a large number of LED light sources due to increased noise and non-uniformity of driving integrated circuits, which complicates the routing of connection lines and affects luminance quality, especially in full array local dimming schemes used for high-image-quality displays like premium TVs.
Innovation Solution
A backlight system with a matrix arrangement of slave driving circuits connected in a daisy chain structure, where a master driving circuit generates input data signals with sequential virtual identifiers to efficiently transfer luminance data, reducing the number of wirings and enhancing noise margin, and allowing for faster local dimming operations by omitting the need for complex identifier configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a huge number of backlight sources are driven using the FALD scheme, then high image quality is achieved, but noise increases and nonuniformity of driving ICs occurs
Solution Approach 1:
The backlight system is divided into multiple driving rows, with each row controlled by a separate input data signal. The slave driving circuits are segmented and arranged in a matrix structure, where each slave driving circuit controls a specific column of light sources. This segmentation allows independent control and reduces the noise and nonuniformity issues associated with controlling a huge number of backlight sources simultaneously.
2Quantity of substance
If the number of driving ICs is increased to drive more backlight sources, then more light sources can be controlled, but device complexity increases
Solution Approach 1:
Multiple slave driving circuits are merged into a daisy-chain connected structure, where the output of one slave driving circuit connects to the input of the next. This merging reduces the need for separate connectors for each driving IC and simplifies the overall system architecture. The master driving circuit generates multiple input data signals that are distributed to driving rows, reducing the need for numerous independent control channels.
Solution Approach 2:
The slave driving circuits are arranged in a two-dimensional matrix structure with driving rows and driving columns. This spatial arrangement allows the system to control a large number of light sources by adding spatial dimensions rather than simply increasing the number of control channels in a single dimension. The daisy-chain connection extends the control capability along the column dimension while rows are controlled by separate input signals.
3Ease of manufacture
If conventional wiring structures are used to connect driving circuits, then connection is simple, but wiring complexity increases and noise margin decreases
Solution Approach 1:
The daisy-chain connection structure merges multiple slave driving circuits into a sequential chain, reducing the total number of connectors and wiring paths needed. Instead of requiring separate connectors for each driving IC to the PCB, the circuits are chained together, simplifying the wiring architecture while maintaining the ability to control a large number of light sources.
Data Source
AI summary
A backlight system includes a backlight and a master driving circuit. The backlight includes a plurality of slave driving circuits and a plurality of light sources driven by the plurality of slave driving circuits, wherein the plurality of slave driving circuits are arranged in a matrix of driving rows and driving columns such that first through m-th slave driving circuits, where m is a positive integer greater than one, are arranged in each driving row of the driving rows, and the first through m-th slave driving circuits are connected in a daisy chain structure. The master driving circuit is configured to generate a plurality of input data signals, wherein each input data signal of the plurality of input data signals corresponds to the each driving row, and the each input data signal includes first through m-th packets including luminance data corresponding to the first through m-th slave driving circuits.